parser

type AddColumnOperation struct {
	Add         string  `parser:"'ADD' 'COLUMN'"`
	IfNotExists bool    `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Column      Column  `parser:"@@"`
	After       *string `parser:"('AFTER' @(Ident | BacktickIdent))?"`
	First       bool    `parser:"@'FIRST'?"`
}

type AddConstraintOperation struct {
	Add         string     `parser:"'ADD' 'CONSTRAINT'"`
	IfNotExists bool       `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name        string     `parser:"@(Ident | BacktickIdent)"`
	Check       string     `parser:"'CHECK'"`
	Expression  Expression `parser:"@@"`
}

type AddIndexOperation struct {
	Add         string     `parser:"'ADD' 'INDEX'"`
	IfNotExists bool       `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name        string     `parser:"@(Ident | BacktickIdent)"`
	Expression  Expression `parser:"@@"`
	Type        string     `parser:"'TYPE' @(Ident | BacktickIdent)"`
	Granularity string     `parser:"'GRANULARITY' @Number"`
	After       *string    `parser:"('AFTER' @(Ident | BacktickIdent))?"`
	First       bool       `parser:"@'FIRST'?"`
}

type AddProjectionOperation struct {
	Add          string           `parser:"'ADD' 'PROJECTION'"`
	IfNotExists  bool             `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name         string           `parser:"@(Ident | BacktickIdent)"`
	SelectClause ProjectionSelect `parser:"@@"`
}

type AdditionExpression struct {
	Multiplication *MultiplicationExpression `parser:"@@"`
	Rest           []AdditionRest            `parser:"@@*"`
}

type AdditionRest struct {
	Op             string                    `parser:"@('+' | '-')"`
	Multiplication *MultiplicationExpression `parser:"@@"`
}

type AlterDatabaseAction struct {
	ModifyComment *string `parser:"'MODIFY' 'COMMENT' @String"`
}

type AlterDatabaseStmt struct {
	LeadingCommentField
	Alter     string               `parser:"'ALTER'"`
	Database  string               `parser:"'DATABASE'"`
	Name      string               `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string              `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Action    *AlterDatabaseAction `parser:"@@"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AlterNamedCollectionOperations struct {
	SetParams    []*NamedCollectionSetParameter `parser:"('SET' @@ (',' @@)*)?"`
	DeleteParams []*string                      `parser:"('DELETE' @(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))*)?"`
}

type AlterNamedCollectionStmt struct {
	Alter      string                          `parser:"'ALTER'"`
	Named      string                          `parser:"'NAMED'"`
	Collection string                          `parser:"'COLLECTION'"`
	IfExists   *string                         `parser:"(@'IF' 'EXISTS')?"`
	Name       string                          `parser:"@(Ident | BacktickIdent)"`
	OnCluster  *string                         `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Operations *AlterNamedCollectionOperations `parser:"@@? ';'"`
}

type AlterRoleStmt struct {
	LeadingCommentField
	IfExists  bool          `parser:"'ALTER' 'ROLE' @('IF' 'EXISTS')?"`
	Name      string        `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string       `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	RenameTo  *string       `parser:"('RENAME' 'TO' @(Ident | BacktickIdent))?"`
	Settings  *RoleSettings `parser:"@@?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AlterTableOperation struct {
	AddColumn        *AddColumnOperation        `parser:"@@"`
	DropColumn       *DropColumnOperation       `parser:"| @@"`
	ModifyColumn     *ModifyColumnOperation     `parser:"| @@"`
	RenameColumn     *RenameColumnOperation     `parser:"| @@"`
	CommentColumn    *CommentColumnOperation    `parser:"| @@"`
	ClearColumn      *ClearColumnOperation      `parser:"| @@"`
	ModifyTTL        *ModifyTTLOperation        `parser:"| @@"`
	DeleteTTL        *DeleteTTLOperation        `parser:"| @@"`
	AddIndex         *AddIndexOperation         `parser:"| @@"`
	DropIndex        *DropIndexOperation        `parser:"| @@"`
	AddConstraint    *AddConstraintOperation    `parser:"| @@"`
	DropConstraint   *DropConstraintOperation   `parser:"| @@"`
	Update           *UpdateOperation           `parser:"| @@"`
	Delete           *DeleteOperation           `parser:"| @@"`
	Freeze           *FreezeOperation           `parser:"| @@"`
	AttachPartition  *AttachPartitionOperation  `parser:"| @@"`
	DetachPartition  *DetachPartitionOperation  `parser:"| @@"`
	DropPartition    *DropPartitionOperation    `parser:"| @@"`
	MovePartition    *MovePartitionOperation    `parser:"| @@"`
	ReplacePartition *ReplacePartitionOperation `parser:"| @@"`
	FetchPartition   *FetchPartitionOperation   `parser:"| @@"`
	ModifyOrderBy    *ModifyOrderByOperation    `parser:"| @@"`
	ModifySampleBy   *ModifySampleByOperation   `parser:"| @@"`
	RemoveSampleBy   *RemoveSampleByOperation   `parser:"| @@"`
	ModifySetting    *ModifySettingOperation    `parser:"| @@"`
	ResetSetting     *ResetSettingOperation     `parser:"| @@"`
	AddProjection    *AddProjectionOperation    `parser:"| @@"`
	DropProjection   *DropProjectionOperation   `parser:"| @@"`
}

type AlterTableStmt struct {
	LeadingCommentField
	Alter      string                `parser:"'ALTER' 'TABLE'"`
	IfExists   bool                  `parser:"@('IF' 'EXISTS')?"`
	Database   *string               `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name       string                `parser:"@(Ident | BacktickIdent)"`
	OnCluster  *string               `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Operations []AlterTableOperation `parser:"@@ (',' @@)*"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AndExpression struct {
	Not  *NotExpression `parser:"@@"`
	Rest []AndRest      `parser:"@@*"`
}

type AndRest struct {
	Op  string         `parser:"@'AND'"`
	Not *NotExpression `parser:"@@"`
}

type ArrayExpression struct {
	Elements []Expression `parser:"'[' (@@ (',' @@)*)? ']'"`
}

type ArrayType struct {
	Array string    `parser:"'Array' '('"`
	Type  *DataType `parser:"@@"`
	Close string    `parser:"')'"`
}

type AttachDatabaseStmt struct {
	LeadingCommentField
	Attach      string          `parser:"'ATTACH'"`
	Database    string          `parser:"'DATABASE'"`
	IfNotExists bool            `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name        string          `parser:"@(Ident | BacktickIdent)"`
	Engine      *DatabaseEngine `parser:"@@?"`
	OnCluster   *string         `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AttachDictionaryStmt struct {
	LeadingCommentField
	IfNotExists *string `parser:"'ATTACH' 'DICTIONARY' (@'IF' 'NOT' 'EXISTS')?"`
	Database    *string `parser:"((@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent))"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AttachPartitionFrom struct {
	From     string  `parser:"'FROM'"`
	Database *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Table    string  `parser:"@(Ident | BacktickIdent)"`
}

type AttachPartitionOperation struct {
	Attach    string               `parser:"'ATTACH' 'PARTITION'"`
	Partition string               `parser:"@(String | Ident | BacktickIdent)"`
	From      *AttachPartitionFrom `parser:"@@?"`
}

type AttachTableStmt struct {
	LeadingCommentField
	Attach      string  `parser:"'ATTACH' 'TABLE'"`
	IfNotExists bool    `parser:"('IF' 'NOT' 'EXISTS')?"`
	Database    *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type AttachViewStmt struct {
	LeadingCommentField
	Attach      string  `parser:"'ATTACH'"`
	View        string  `parser:"'VIEW'"`
	IfNotExists bool    `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Database    *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type BetweenComparison struct {
	Not     bool               `parser:"@'NOT'?"`
	Between string             `parser:"'BETWEEN'"`
	Expr    *BetweenExpression `parser:"@@"`
}

type BetweenExpression struct {
	Low  AdditionExpression `parser:"@@"`
	And  string             `parser:"'AND'"`
	High AdditionExpression `parser:"@@"`
}

type CaseExpression struct {
	Case        string       `parser:"'CASE'"`
	WhenClauses []WhenClause `parser:"@@+"`
	ElseClause  *ElseClause  `parser:"@@?"`
	End         string       `parser:"'END'"`
}

type CastExpression struct {
	Cast       string     `parser:"'CAST' '('"`
	Expression Expression `parser:"@@"`
	As         string     `parser:"'AS'"`
	Type       DataType   `parser:"@@"`
	Close      string     `parser:"')'"`
}

type ClearColumnOperation struct {
	Clear     string `parser:"'CLEAR' 'COLUMN'"`
	IfExists  bool   `parser:"@('IF' 'EXISTS')?"`
	Name      string `parser:"@(Ident | BacktickIdent)"`
	In        string `parser:"'IN'"`
	Partition string `parser:"'PARTITION' @(String | Ident | BacktickIdent)"`
}

type CodecClause struct {
	Codec  string      `parser:"'CODEC' '('"`
	Codecs []CodecSpec `parser:"@@ (',' @@)*"`
	Close  string      `parser:"')'"`
}

type CodecSpec struct {
	Name       string          `parser:"@(Ident | BacktickIdent)"`
	Parameters []TypeParameter `parser:"('(' @@ (',' @@)* ')')?"`
}

type Column struct {
	LeadingComments  []string          `parser:"@(Comment | MultilineComment)*"`
	Name             string            `parser:"@(Ident | BacktickIdent)"`
	DataType         *DataType         `parser:"@@"`
	Attributes       []ColumnAttribute `parser:"@@*"`
	TrailingComments []string          `parser:"@(Comment | MultilineComment)*"`
}

type ColumnAttribute struct {
	Default *DefaultClause `parser:"@@"`
	Codec   *CodecClause   `parser:"| @@"`
	TTL     *TTLClause     `parser:"| @@"`
	Comment *string        `parser:"| ('COMMENT' @String)"`
}

type CommentAccessor interface {
	GetLeadingComments() []string
	GetTrailingComments() []string
}

type CommentColumnOperation struct {
	Comment  string `parser:"'COMMENT' 'COLUMN'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	Name     string `parser:"@(Ident | BacktickIdent)"`
	Value    string `parser:"@String"`
}

type CommentStatement struct {
	Comment string `parser:"@(Comment | MultilineComment)"`
}

type CommonTableExpression struct {
	Name  string           `parser:"@(Ident | BacktickIdent)"`
	As    string           `parser:"'AS'"`
	Query *SelectStatement `parser:"'(' @@ ')'"`
}

type ComparisonExpression struct {
	Addition *AdditionExpression `parser:"@@"`
	Rest     *ComparisonRest     `parser:"@@?"`
	IsNull   *IsNullExpr         `parser:"@@?"`
}

type ComparisonRest struct {
	SimpleOp  *SimpleComparison  `parser:"@@"`
	InOp      *InComparison      `parser:"| @@"`
	BetweenOp *BetweenComparison `parser:"| @@"`
}

type ConstraintDefinition struct {
	Constraint string     `parser:"'CONSTRAINT'"`
	Name       string     `parser:"@(Ident | BacktickIdent)"`
	Check      string     `parser:"'CHECK'"`
	Expression Expression `parser:"@@"`
}

type CreateDatabaseStmt struct {
	LeadingCommentField
	Create      string          `parser:"'CREATE'"`
	Database    string          `parser:"'DATABASE'"`
	IfNotExists bool            `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name        string          `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string         `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Engine      *DatabaseEngine `parser:"@@?"`
	Comment     *string         `parser:"('COMMENT' @String)?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type CreateDictionaryStmt struct {
	LeadingCommentField
	Create      string              `parser:"'CREATE'"`
	OrReplace   bool                `parser:"@('OR' 'REPLACE')?"`
	Dictionary  string              `parser:"'DICTIONARY'"`
	IfNotExists *string             `parser:"(@'IF' 'NOT' 'EXISTS')?"`
	Database    *string             `parser:"((@(Ident | BacktickIdent) '.')?"`
	Name        string              `parser:"@(Ident | BacktickIdent))"`
	OnCluster   *string             `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Columns     []*DictionaryColumn `parser:"'(' @@* ')'"`
	Clauses     []DictionaryClause  `parser:"@@*"`
	Comment     *string             `parser:"('COMMENT' @String)?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type CreateFunctionStmt struct {
	LeadingCommentField
	Name       string           `parser:"'CREATE' 'FUNCTION' @(Ident | BacktickIdent)"`
	OnCluster  *string          `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Parameters []*FunctionParam `parser:"'AS' ( '(' (@@ (',' @@)*)? ')' | @@ )"`
	Expression *Expression      `parser:"'->' @@"`
	TrailingCommentField
	Semicolon bool `parser:"';'?"`
}

type CreateNamedCollectionStmt struct {
	Create         string                      `parser:"'CREATE'"`
	OrReplace      bool                        `parser:"@('OR' 'REPLACE')?"`
	Named          string                      `parser:"'NAMED'"`
	Collection     string                      `parser:"'COLLECTION'"`
	IfNotExists    *string                     `parser:"(@'IF' 'NOT' 'EXISTS')?"`
	Name           string                      `parser:"@(Ident | BacktickIdent)"`
	OnCluster      *string                     `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	As             string                      `parser:"'AS'"`
	Parameters     []*NamedCollectionParameter `parser:"@@*"`
	GlobalOverride *NamedCollectionOverride    `parser:"@@?"`
	Comment        *string                     `parser:"('COMMENT' @String)? ';'"`
}

type CreateRoleStmt struct {
	LeadingCommentField
	OrReplace   bool          `parser:"'CREATE' (@'OR' 'REPLACE')? 'ROLE'"`
	IfNotExists bool          `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Name        string        `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string       `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Settings    *RoleSettings `parser:"@@?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type CreateTableStmt struct {
	LeadingCommentField
	Create            string         `parser:"'CREATE'"`
	OrReplace         bool           `parser:"@('OR' 'REPLACE')?"`
	Table             string         `parser:"'TABLE'"`
	IfNotExists       bool           `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Database          *string        `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name              string         `parser:"@(Ident | BacktickIdent)"`
	OnCluster         *string        `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	AsTable           *TableSource   `parser:"('AS' @@)?"`
	Elements          []TableElement `parser:"('(' @@ (',' @@)* ')')?"`
	PreEngineComments []string       `parser:"@(Comment | MultilineComment)*"`
	Engine            *TableEngine   `parser:"@@"`
	Clauses           []TableClause  `parser:"@@*"`
	Comment           *string        `parser:"('COMMENT' @String)?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type CreateViewStmt struct {
	LeadingCommentField
	Create       string           `parser:"'CREATE'"`
	OrReplace    bool             `parser:"@('OR' 'REPLACE')?"`
	Materialized bool             `parser:"@'MATERIALIZED'?"`
	View         string           `parser:"'VIEW'"`
	IfNotExists  bool             `parser:"@('IF' 'NOT' 'EXISTS')?"`
	Database     *string          `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name         string           `parser:"@(Ident | BacktickIdent)"`
	OnCluster    *string          `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	To           *ViewTableTarget `parser:"('TO' @@)?"`
	Engine       *ViewEngine      `parser:"@@?"`
	Populate     bool             `parser:"@'POPULATE'?"`
	AsSelect     *SelectStatement `parser:"'AS' @@"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DataType struct {
	// Nullable wrapper (e.g., Nullable(String))
	Nullable *NullableType `parser:"@@"`
	// Array types (e.g., Array(String))
	Array *ArrayType `parser:"| @@"`
	// Tuple types (e.g., Tuple(name String, age UInt8))
	Tuple *TupleType `parser:"| @@"`
	// Nested types (e.g., Nested(id UInt32, name String))
	Nested *NestedType `parser:"| @@"`
	// Map types (e.g., Map(String, UInt32))
	Map *MapType `parser:"| @@"`
	// LowCardinality wrapper (e.g., LowCardinality(String))
	LowCardinality *LowCardinalityType `parser:"| @@"`
	// Simple or parametric types (e.g., String, FixedString(10), Decimal(10,2))
	Simple *SimpleType `parser:"| @@"`
}

type DataTypeComparable interface {
	Equal(other DataTypeComparable) bool
	TypeName() string
}

type DatabaseEngine struct {
	Name       string                 `parser:"'ENGINE' '=' @(Ident | BacktickIdent)"`
	Parameters []*DatabaseEngineParam `parser:"('(' @@ (',' @@)* ')')?"`
}

type DatabaseEngineParam struct {
	Value string `parser:"@(String | Number | Ident | BacktickIdent)"`
}

type DatabaseRename struct {
	From string `parser:"@(Ident | BacktickIdent)"`
	To   string `parser:"'TO' @(Ident | BacktickIdent)"`
}

type DefaultClause struct {
	Type       string     `parser:"@('DEFAULT' | 'MATERIALIZED' | 'EPHEMERAL' | 'ALIAS')"`
	Expression Expression `parser:"@@"`
}

type DeleteOperation struct {
	Delete string     `parser:"'DELETE'"`
	Where  Expression `parser:"'WHERE' @@"`
}

type DeleteTTLOperation struct {
	Delete string `parser:"'DELETE' 'TTL'"`
}

type DetachDatabaseStmt struct {
	LeadingCommentField
	Detach      string  `parser:"'DETACH'"`
	Database    string  `parser:"'DATABASE'"`
	IfExists    bool    `parser:"@('IF' 'EXISTS')?"`
	Name        string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Permanently bool    `parser:"@'PERMANENTLY'?"`
	Sync        bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DetachDictionaryStmt struct {
	LeadingCommentField
	IfExists    *string `parser:"'DETACH' 'DICTIONARY' (@'IF' 'EXISTS')?"`
	Database    *string `parser:"((@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent))"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Permanently *string `parser:"(@'PERMANENTLY')?"`
	Sync        *string `parser:"(@'SYNC')?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DetachPartitionOperation struct {
	Detach    string `parser:"'DETACH' 'PARTITION'"`
	Partition string `parser:"@(String | Ident | BacktickIdent)"`
}

type DetachTableStmt struct {
	LeadingCommentField
	Detach      string  `parser:"'DETACH' 'TABLE'"`
	IfExists    bool    `parser:"('IF' 'EXISTS')?"`
	Database    *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Permanently bool    `parser:"@'PERMANENTLY'?"`
	Sync        bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DetachViewStmt struct {
	LeadingCommentField
	Detach      string  `parser:"'DETACH'"`
	View        string  `parser:"'VIEW'"`
	IfExists    bool    `parser:"@('IF' 'EXISTS')?"`
	Database    *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name        string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster   *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Permanently bool    `parser:"@'PERMANENTLY'?"`
	Sync        bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DictionaryClause struct {
	PrimaryKey *DictionaryPrimaryKey `parser:"@@"`
	Source     *DictionarySource     `parser:"| @@"`
	Layout     *DictionaryLayout     `parser:"| @@"`
	Lifetime   *DictionaryLifetime   `parser:"| @@"`
	Settings   *DictionarySettings   `parser:"| @@"`
}

type DictionaryColumn struct {
	Name       string                   `parser:"@(Ident | BacktickIdent)"`
	Type       string                   `parser:"@(Ident | BacktickIdent)"`
	Default    *DictionaryColumnDefault `parser:"@@?"`
	Attributes []*DictionaryColumnAttr  `parser:"@@*"`
	Comma      *string                  `parser:"@','?"`
}

type DictionaryColumnAttr struct {
	Name string `parser:"@('IS_OBJECT_ID' | 'HIERARCHICAL' | 'INJECTIVE')"`
}

type DictionaryColumnDefault struct {
	Type       string     `parser:"(@'DEFAULT' | @'EXPRESSION')"`
	Expression Expression `parser:"@@"`
}

type DictionaryDSLFunc struct {
	Name   string                `parser:"@(Ident | BacktickIdent)"`
	Params []*DictionaryDSLParam `parser:"'(' @@* ')'"`
}

type DictionaryDSLParam struct {
	SimpleParam *SimpleDSLParam    `parser:"(@@ ','?)"`
	NestedFunc  *DictionaryDSLFunc `parser:"| (@@ ','?)"`
}

type DictionaryLayout struct {
	Name       string                 `parser:"'LAYOUT' '(' @(Ident | BacktickIdent)"`
	Parameters []*DictionaryParameter `parser:"('(' @@* ')')? ')'"`
}

type DictionaryLifetime struct {
	MinMax *DictionaryLifetimeMinMax `parser:"'LIFETIME' '(' (@@"`
	Single *string                   `parser:"| @Number) ')'"`
}

type DictionaryLifetimeMaxFirst struct {
	MaxValue string `parser:"'MAX' @Number"`
	MinValue string `parser:"'MIN' @Number"`
}

type DictionaryLifetimeMinFirst struct {
	MinValue string `parser:"'MIN' @Number"`
	MaxValue string `parser:"'MAX' @Number"`
}

type DictionaryLifetimeMinMax struct {
	MinFirst *DictionaryLifetimeMinFirst `parser:"@@"`
	MaxFirst *DictionaryLifetimeMaxFirst `parser:"| @@"`
}

type DictionaryParameter struct {
	DSLFunction *DictionaryDSLFunc `parser:"(@@ ','?)"`
	SimpleParam *SimpleParameter   `parser:"| (@@ ','?)"`
}

type DictionaryPrimaryKey struct {
	Keys []string `parser:"'PRIMARY' 'KEY' @(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))*"`
}

type DictionaryRename struct {
	FromDatabase *string `parser:"((@(Ident | BacktickIdent) '.')?"`
	FromName     string  `parser:"@(Ident | BacktickIdent))"`
	ToDatabase   *string `parser:"'TO' ((@(Ident | BacktickIdent) '.')?"`
	ToName       string  `parser:"@(Ident | BacktickIdent))"`
}

type DictionarySetting struct {
	Name  string  `parser:"@(Ident | BacktickIdent) '='"`
	Value string  `parser:"@(String | Number | Ident | BacktickIdent)"`
	Comma *string `parser:"@','?"`
}

type DictionarySettings struct {
	Settings []*DictionarySetting `parser:"'SETTINGS' '(' @@* ')'"`
}

type DictionarySource struct {
	Name       string                 `parser:"'SOURCE' '(' @(Ident | BacktickIdent)"`
	Parameters []*DictionaryParameter `parser:"('(' @@* ')')? ')'"`
}

type DropColumnOperation struct {
	Drop     string `parser:"'DROP' 'COLUMN'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	Name     string `parser:"@(Ident | BacktickIdent)"`
}

type DropConstraintOperation struct {
	Drop     string `parser:"'DROP' 'CONSTRAINT'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	Name     string `parser:"@(Ident | BacktickIdent)"`
}

type DropDatabaseStmt struct {
	LeadingCommentField
	Drop      string  `parser:"'DROP'"`
	Database  string  `parser:"'DATABASE'"`
	IfExists  bool    `parser:"@('IF' 'EXISTS')?"`
	Name      string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Sync      bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DropDictionaryStmt struct {
	LeadingCommentField
	IfExists  *string `parser:"'DROP' 'DICTIONARY' (@'IF' 'EXISTS')?"`
	Database  *string `parser:"((@(Ident | BacktickIdent) '.')?"`
	Name      string  `parser:"@(Ident | BacktickIdent))"`
	OnCluster *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Sync      *string `parser:"(@'SYNC')?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DropFunctionStmt struct {
	LeadingCommentField
	IfExists  bool    `parser:"'DROP' 'FUNCTION' @('IF' 'EXISTS')?"`
	Name      string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DropIndexOperation struct {
	Drop     string `parser:"'DROP' 'INDEX'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	Name     string `parser:"@(Ident | BacktickIdent)"`
}

type DropNamedCollectionStmt struct {
	Drop       string  `parser:"'DROP'"`
	Named      string  `parser:"'NAMED'"`
	Collection string  `parser:"'COLLECTION'"`
	IfExists   *string `parser:"(@'IF' 'EXISTS')?"`
	Name       string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster  *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Semicolon  string  `parser:"';'"`
}

type DropPartitionOperation struct {
	Drop      string `parser:"'DROP' 'PARTITION'"`
	Partition string `parser:"@(String | Ident | BacktickIdent)"`
}

type DropProjectionOperation struct {
	Drop     string `parser:"'DROP' 'PROJECTION'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	Name     string `parser:"@(Ident | BacktickIdent)"`
}

type DropRoleStmt struct {
	LeadingCommentField
	IfExists  bool     `parser:"'DROP' 'ROLE' @('IF' 'EXISTS')?"`
	Names     []string `parser:"@(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))*"`
	OnCluster *string  `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DropTableStmt struct {
	LeadingCommentField
	Drop      string  `parser:"'DROP' 'TABLE'"`
	IfExists  bool    `parser:"('IF' 'EXISTS')?"`
	Database  *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name      string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Sync      bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type DropViewStmt struct {
	LeadingCommentField
	Drop      string  `parser:"'DROP'"`
	View      string  `parser:"'VIEW'"`
	IfExists  bool    `parser:"@('IF' 'EXISTS')?"`
	Database  *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name      string  `parser:"@(Ident | BacktickIdent)"`
	OnCluster *string `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	Sync      bool    `parser:"@'SYNC'?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type ElseClause struct {
	Else   string `parser:"'ELSE'"`
	Result string `parser:"@(~'END')+"`
}

type EngineParameter struct {
	Expression *Expression `parser:"@@"`
	String     *string     `parser:"| @String"`
	Number     *string     `parser:"| @Number"`
	Ident      *string     `parser:"| @(Ident | BacktickIdent)"`
}

type Expression struct {
	Case *CaseExpression `parser:"@@"`
	Or   *OrExpression   `parser:"| @@"`
}

type ExtractExpression struct {
	Extract string     `parser:"'EXTRACT' '('"`
	Part    string     `parser:"@('YEAR' | 'MONTH' | 'DAY' | 'HOUR' | 'MINUTE' | 'SECOND')"`
	From    string     `parser:"'FROM'"`
	Expr    Expression `parser:"@@"`
	Close   string     `parser:"')'"`
}

type FetchPartitionOperation struct {
	Fetch     string `parser:"'FETCH' 'PARTITION'"`
	Partition string `parser:"@(String | Ident | BacktickIdent)"`
	From      string `parser:"'FROM' @String"`
}

type FrameBound struct {
	Type      string `parser:"@('UNBOUNDED' | 'CURRENT' | Number)"`
	Direction string `parser:"@('PRECEDING' | 'FOLLOWING' | 'ROW')?"`
}

type FreezeOperation struct {
	Freeze    string  `parser:"'FREEZE'"`
	Partition *string `parser:"('PARTITION' @(String | Ident | BacktickIdent))?"`
	With      *string `parser:"('WITH' 'NAME' @String)?"`
}

type FromClause struct {
	From  string       `parser:"'FROM'"`
	Table TableRef     `parser:"@@"`
	Joins []JoinClause `parser:"@@*"`
}

type FunctionArg struct {
	Star       *string     `parser:"@'*'"`
	Expression *Expression `parser:"| @@"`
}

type FunctionCall struct {
	Name             string        `parser:"@(Ident | BacktickIdent)"`
	FirstParentheses []FunctionArg `parser:"'(' (@@ (',' @@)*)? ')'"`
	// Optional second set of parentheses for parameterized functions
	SecondParentheses []FunctionArg `parser:"('(' (@@ (',' @@)*)? ')')?"`
	Over              *OverClause   `parser:"@@?"`
}

type FunctionParam struct {
	Name string `parser:"@(Ident | BacktickIdent)"`
}

type FunctionWithAlias struct {
	Function TableFunction `parser:"@@"`
	Alias    *string       `parser:"('AS' @(Ident | BacktickIdent))?"`
}

type GrantStmt struct {
	LeadingCommentField
	Privileges  *PrivilegeList `parser:"'GRANT' @@"`
	OnCluster   *string        `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	On          *GrantTarget   `parser:"('ON' @@)?"`
	To          *GranteeList   `parser:"'TO' @@"`
	WithGrant   bool           `parser:"@('WITH' 'GRANT' 'OPTION')?"`
	WithReplace bool           `parser:"@('WITH' 'REPLACE' 'OPTION')?"`
	WithAdmin   bool           `parser:"@('WITH' 'ADMIN' 'OPTION')?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type GrantTarget struct {
	Star1    *string `parser:"( @'*'"`
	Star2    *string `parser:"  '.' @'*'"`
	Database *string `parser:"| @(Ident | BacktickIdent)"`
	Table    *string `parser:"  '.' @(Ident | BacktickIdent | '*'))"`
}

type Grantee struct {
	Name      string `parser:"@(Ident | BacktickIdent)"`
	IsCurrent bool   `parser:"| @'CURRENT_USER'"`
}

type GranteeList struct {
	Items []*Grantee `parser:"@@ (',' @@)*"`
}

type GroupByClause struct {
	GroupBy    string       `parser:"'GROUP' 'BY'"`
	All        bool         `parser:"(@'ALL'"`
	Columns    []Expression `parser:"| @@ (',' @@)*)"`
	WithClause *string      `parser:"('WITH' @('CUBE' | 'ROLLUP' | 'TOTALS'))?"`
}

type HavingClause struct {
	Having    string     `parser:"'HAVING'"`
	Condition Expression `parser:"@@"`
}

type IdentifierExpr struct {
	Database *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Table    *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name     string  `parser:"@(Ident | BacktickIdent)"`
}

type InComparison struct {
	Not  bool          `parser:"@'NOT'?"`
	In   string        `parser:"'IN'"`
	Expr *InExpression `parser:"@@"`
}

type InExpression struct {
	List     []Expression     `parser:"'(' @@ (',' @@)* ')'"`
	Array    *ArrayExpression `parser:"| @@"`
	Subquery *Subquery        `parser:"| @@"`
}

type IndexDefinition struct {
	Index       string     `parser:"'INDEX'"`
	Name        string     `parser:"@(Ident | BacktickIdent)"`
	Expression  Expression `parser:"@@"`
	Type        string     `parser:"'TYPE'"`
	IndexType   IndexType  `parser:"@@"`
	Granularity *string    `parser:"('GRANULARITY' @Number)?"`
}

type IndexNGramBFType struct {
	NGramBF string `parser:"'ngrambf_v1' '('"`
	N       string `parser:"@Number"`
	Comma1  string `parser:"','"`
	Size    string `parser:"@Number"`
	Comma2  string `parser:"','"`
	Hashes  string `parser:"@Number"`
	Comma3  string `parser:"','"`
	Seed    string `parser:"@Number"`
	Close   string `parser:"')'"`
}

type IndexSetType struct {
	Set     string `parser:"'set' '('"`
	MaxRows string `parser:"@Number"`
	Close   string `parser:"')'"`
}

type IndexTokenBFType struct {
	TokenBF string `parser:"'tokenbf_v1' '('"`
	Size    string `parser:"@Number"`
	Comma1  string `parser:"','"`
	Hashes  string `parser:"@Number"`
	Comma2  string `parser:"','"`
	Seed    string `parser:"@Number"`
	Close   string `parser:"')'"`
}

type IndexType struct {
	// Simple index types
	BloomFilter bool `parser:"@'bloom_filter'"`
	MinMax      bool `parser:"| @'minmax'"`
	Hypothesis  bool `parser:"| @'hypothesis'"`

	// Parametric index types
	Set     *IndexSetType     `parser:"| @@"`
	TokenBF *IndexTokenBFType `parser:"| @@"`
	NGramBF *IndexNGramBFType `parser:"| @@"`

	// Custom/future index types - fallback to string
	Custom *string `parser:"| @(Ident | BacktickIdent)"`
}

type InterpolateClause struct {
	Interpolate string              `parser:"'INTERPOLATE'"`
	Columns     []InterpolateColumn `parser:"('(' (@@ (',' @@)*)? ')')?"`
}

type InterpolateColumn struct {
	Name       string      `parser:"@(Ident | BacktickIdent)"`
	Expression *Expression `parser:"('AS' @@)?"`
}

type IntervalExpr struct {
	Interval string `parser:"'INTERVAL'"`
	Value    string `parser:"@Number"`
	Unit     string `parser:"@('SECOND' | 'MINUTE' | 'HOUR' | 'DAY' | 'WEEK' | 'MONTH' | 'QUARTER' | 'YEAR')"`
}

type IsNullExpr struct {
	Is   string `parser:"'IS'"`
	Not  bool   `parser:"@'NOT'?"`
	Null string `parser:"'NULL'"`
}

type JoinClause struct {
	Type      string         `parser:"@('INNER' | 'LEFT' | 'RIGHT' | 'FULL' | 'CROSS')?"`
	Join      string         `parser:"@('JOIN' | 'ARRAY' 'JOIN' | 'GLOBAL' 'JOIN' | 'ASOF' 'JOIN')"`
	Table     TableRef       `parser:"@@"`
	Condition *JoinCondition `parser:"@@?"`
}

type JoinCondition struct {
	On    *Expression `parser:"'ON' @@"`
	Using []string    `parser:"| 'USING' '(' @(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))* ')'"`
}

type LeadingCommentField struct {
	LeadingComments []string `parser:"@(Comment | MultilineComment)*"`
}

type LimitBy struct {
	By      string       `parser:"'BY'"`
	Columns []Expression `parser:"@@ (',' @@)*"`
}

type LimitClause struct {
	Limit  string        `parser:"'LIMIT'"`
	Count  Expression    `parser:"@@"`
	Offset *OffsetClause `parser:"@@?"`
	By     *LimitBy      `parser:"@@?"`
}

type Literal struct {
	StringValue *string `parser:"@String"`
	Number      *string `parser:"| @Number"`
	Boolean     *string `parser:"| @('TRUE' | 'FALSE')"`
	Null        bool    `parser:"| @'NULL'"`
}

type LowCardinalityType struct {
	LowCardinality string    `parser:"'LowCardinality' '('"`
	Type           *DataType `parser:"@@"`
	Close          string    `parser:"')'"`
}

type MapType struct {
	Map       string    `parser:"'Map' '('"`
	KeyType   *DataType `parser:"@@"`
	Comma     string    `parser:"','"`
	ValueType *DataType `parser:"@@"`
	Close     string    `parser:"')'"`
}

type ModifyColumnOperation struct {
	Modify   string              `parser:"'MODIFY' 'COLUMN'"`
	IfExists bool                `parser:"@('IF' 'EXISTS')?"`
	Name     string              `parser:"@(Ident | BacktickIdent)"`
	Type     *DataType           `parser:"@@?"`
	Default  *DefaultClause      `parser:"@@?"`
	Codec    *CodecClause        `parser:"@@?"`
	TTL      *Expression         `parser:"('TTL' @@)?"`
	Comment  *string             `parser:"('COMMENT' @String)?"`
	Remove   *ModifyColumnRemove `parser:"@@?"`
}

type ModifyColumnRemove struct {
	Remove string `parser:"'REMOVE'"`
	What   string `parser:"@('DEFAULT' | 'MATERIALIZED' | 'ALIAS' | 'COMMENT' | 'CODEC' | 'TTL')"`
}

type ModifyOrderByOperation struct {
	Modify     string     `parser:"'MODIFY' 'ORDER' 'BY'"`
	Expression Expression `parser:"@@"`
}

type ModifySampleByOperation struct {
	Modify     string     `parser:"'MODIFY' 'SAMPLE' 'BY'"`
	Expression Expression `parser:"@@"`
}

type ModifySettingOperation struct {
	Modify  string       `parser:"'MODIFY' 'SETTING'"`
	Setting TableSetting `parser:"@@"`
}

type ModifyTTLOperation struct {
	Modify     string     `parser:"'MODIFY' 'TTL'"`
	Expression Expression `parser:"@@"`
	Delete     *TTLDelete `parser:"@@?"`
}

type MovePartitionOperation struct {
	Move      string       `parser:"'MOVE' 'PARTITION'"`
	Partition string       `parser:"@(String | Ident | BacktickIdent)"`
	To        string       `parser:"'TO'"`
	Disk      *string      `parser:"(('DISK' @String)"`
	Volume    *string      `parser:"| ('VOLUME' @String)"`
	Table     *MoveToTable `parser:"| ('TABLE' @@))?"`
}

type MoveToTable struct {
	Database *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Name     string  `parser:"@(Ident | BacktickIdent)"`
}

type MultiplicationExpression struct {
	Unary *UnaryExpression     `parser:"@@"`
	Rest  []MultiplicationRest `parser:"@@*"`
}

type MultiplicationRest struct {
	Op    string           `parser:"@('*' | '/' | '%')"`
	Unary *UnaryExpression `parser:"@@"`
}

type NamedCollectionOverride struct {
	NotOverridable bool `parser:"@('NOT' 'OVERRIDABLE')"`
	Overridable    bool `parser:"| @'OVERRIDABLE'"`
}

type NamedCollectionParameter struct {
	Key      string                   `parser:"@(Ident | BacktickIdent) '='"`
	Value    *NamedCollectionValue    `parser:"@@"`
	Override *NamedCollectionOverride `parser:"@@?"`
	Comma    *string                  `parser:"@','?"`
}

type NamedCollectionSetParameter struct {
	Key      string                   `parser:"@(Ident | BacktickIdent) '='"`
	Value    *NamedCollectionValue    `parser:"@@"`
	Override *NamedCollectionOverride `parser:"@@?"`
}

type NamedCollectionValue struct {
	String *string  `parser:"@String"`
	Number *float64 `parser:"| @Number"`
	Bool   *string  `parser:"| @('TRUE' | 'FALSE')"`
	Null   *string  `parser:"| @'NULL'"`
}

type NestedColumn struct {
	Name string    `parser:"@(Ident | BacktickIdent)"`
	Type *DataType `parser:"@@"`
}

type NestedType struct {
	Nested  string         `parser:"'Nested' '('"`
	Columns []NestedColumn `parser:"@@ (',' @@)*"`
	Close   string         `parser:"')'"`
}

type NotExpression struct {
	Not        bool                  `parser:"@'NOT'?"`
	Comparison *ComparisonExpression `parser:"@@"`
}

type NullableType struct {
	Nullable string    `parser:"'Nullable' '('"`
	Type     *DataType `parser:"@@"`
	Close    string    `parser:"')'"`
}

type OffsetClause struct {
	Offset string     `parser:"'OFFSET'"`
	Value  Expression `parser:"@@"`
}

type OrExpression struct {
	And  *AndExpression `parser:"@@"`
	Rest []OrRest       `parser:"@@*"`
}

type OrRest struct {
	Op  string         `parser:"@'OR'"`
	And *AndExpression `parser:"@@"`
}

type OrderByClause struct {
	OrderBy    string     `parser:"'ORDER' 'BY'"`
	Expression Expression `parser:"@@"`
}

type OrderByColumn struct {
	Expression    Expression  `parser:"@@"`
	Direction     *string     `parser:"@('ASC' | 'DESC')?"`
	Nulls         *string     `parser:"('NULLS' @('FIRST' | 'LAST'))?"`
	Collate       *string     `parser:"('COLLATE' @String)?"`
	WithFill      bool        `parser:"@('WITH' 'FILL')?"`
	FillFrom      *Expression `parser:"('FROM' @@)?"`
	FillTo        *Expression `parser:"('TO' @@)?"`
	FillStep      *Expression `parser:"('STEP' @@)?"`
	FillStaleness *Expression `parser:"('STALENESS' @@)?"`
}

type OrderByExpr struct {
	Expression Expression `parser:"@@"`
	Desc       bool       `parser:"@'DESC'?"`
	Nulls      *string    `parser:"('NULLS' @('FIRST' | 'LAST'))?"`
}

type OverClause struct {
	Over        string        `parser:"'OVER'"`
	PartitionBy []Expression  `parser:"'(' ('PARTITION' 'BY' @@ (',' @@)*)?"`
	OrderBy     []OrderByExpr `parser:"('ORDER' 'BY' @@ (',' @@)*)?"`
	Frame       *WindowFrame  `parser:"@@? ')'"`
}

type ParametricFunction struct {
	Name       string          `parser:"@(Ident | BacktickIdent)"`
	Parameters []TypeParameter `parser:"'(' (@@ (',' @@)*)? ')'"`
}

type ParenExpression struct {
	Expression Expression `parser:"'(' @@ ')'"`
}

type PartitionByClause struct {
	PartitionBy string     `parser:"'PARTITION' 'BY'"`
	Expression  Expression `parser:"@@"`
}

type PrimaryExpression struct {
	Literal     *Literal           `parser:"@@"`
	Interval    *IntervalExpr      `parser:"| @@"`
	Extract     *ExtractExpression `parser:"| @@"`
	Cast        *CastExpression    `parser:"| @@"`
	Function    *FunctionCall      `parser:"| @@"`
	Identifier  *IdentifierExpr    `parser:"| @@"`
	Parentheses *ParenExpression   `parser:"| @@"`
	Tuple       *TupleExpression   `parser:"| @@"`
	Array       *ArrayExpression   `parser:"| @@"`
}

type PrimaryKeyClause struct {
	PrimaryKey string     `parser:"'PRIMARY' 'KEY'"`
	Expression Expression `parser:"@@"`
}

type PrivilegeItem struct {
	// This is simplified - in reality, privileges can be complex expressions
	// We'll parse them as identifiers and let ClickHouse validate
	All     bool     `parser:"@'ALL'"`
	Name    string   `parser:"| @(Ident | BacktickIdent)"`
	Columns []string `parser:"('(' @(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))* ')')?"`
}

type PrivilegeList struct {
	Items []*PrivilegeItem `parser:"@@ (',' @@)*"`
}

type ProjectionDefinition struct {
	Projection   string           `parser:"'PROJECTION'"`
	Name         string           `parser:"@(Ident | BacktickIdent)"`
	SelectClause ProjectionSelect `parser:"@@"`
}

type ProjectionSelect struct {
	OpenParen  string          `parser:"'('"`
	SelectStmt SelectStatement `parser:"@@"`
	CloseParen string          `parser:"')'"`
}

type RemoveSampleByOperation struct {
	Remove string `parser:"'REMOVE' 'SAMPLE' 'BY'"`
}

type RenameColumnOperation struct {
	Rename   string `parser:"'RENAME' 'COLUMN'"`
	IfExists bool   `parser:"@('IF' 'EXISTS')?"`
	From     string `parser:"@(Ident | BacktickIdent)"`
	To       string `parser:"'TO' @(Ident | BacktickIdent)"`
}

type RenameDatabaseStmt struct {
	LeadingCommentField
	Rename    string            `parser:"'RENAME'"`
	Database  string            `parser:"'DATABASE'"`
	Renames   []*DatabaseRename `parser:"@@ (',' @@)*"`
	OnCluster *string           `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type RenameDictionaryStmt struct {
	LeadingCommentField
	Renames   []*DictionaryRename `parser:"'RENAME' 'DICTIONARY' @@ (',' @@)*"`
	OnCluster *string             `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type RenameTableStmt struct {
	LeadingCommentField
	Rename    string        `parser:"'RENAME' 'TABLE'"`
	Renames   []TableRename `parser:"@@ (',' @@)*"`
	OnCluster *string       `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type ReplacePartitionOperation struct {
	Replace   string  `parser:"'REPLACE' 'PARTITION'"`
	Partition string  `parser:"@(String | Ident | BacktickIdent)"`
	From      string  `parser:"'FROM'"`
	Database  *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Table     string  `parser:"@(Ident | BacktickIdent)"`
}

type ResetSettingOperation struct {
	Reset string `parser:"'RESET' 'SETTING'"`
	Name  string `parser:"@(Ident | BacktickIdent)"`
}

type RevokeStmt struct {
	LeadingCommentField
	GrantOption bool           `parser:"'REVOKE' (@'GRANT' 'OPTION' 'FOR'"`
	AdminOption bool           `parser:"| @'ADMIN' 'OPTION' 'FOR')?"`
	Privileges  *PrivilegeList `parser:"@@"`
	OnCluster   *string        `parser:"('ON' 'CLUSTER' @(Ident | BacktickIdent))?"`
	On          *GrantTarget   `parser:"('ON' @@)?"`
	From        *GranteeList   `parser:"'FROM' @@"`
	TrailingCommentField
	Semicolon bool `parser:"';'"`
}

type RoleList struct {
	Names []string `parser:"@(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))*"`
}

type RoleSetting struct {
	Name  string  `parser:"@(Ident | BacktickIdent)"`
	Value *string `parser:"('=' @(Number | String | Ident | BacktickIdent))?"`
}

type RoleSettings struct {
	Settings []*RoleSetting `parser:"'SETTINGS' @@ (',' @@)*"`
}

type SQL struct {
	Statements []*Statement `parser:"@@*"`
}

type SampleByClause struct {
	SampleBy   string     `parser:"'SAMPLE' 'BY'"`
	Expression Expression `parser:"@@"`
}

type SelectColumn struct {
	Star       *string     `parser:"@'*'"`
	Expression *Expression `parser:"| @@"`
	Alias      *string     `parser:"('AS' @(Ident | BacktickIdent))?"`
}

type SelectOrderByClause struct {
	OrderBy     string             `parser:"'ORDER' 'BY'"`
	Columns     []OrderByColumn    `parser:"@@ (',' @@)*"`
	Interpolate *InterpolateClause `parser:"@@?"`
}

type SelectStatement struct {
	With     *WithClause          `parser:"@@?"`
	Select   string               `parser:"'SELECT'"`
	Distinct bool                 `parser:"@'DISTINCT'?"`
	Columns  []SelectColumn       `parser:"@@ (',' @@)*"`
	From     *FromClause          `parser:"@@?"`
	Where    *WhereClause         `parser:"@@?"`
	GroupBy  *GroupByClause       `parser:"@@?"`
	Having   *HavingClause        `parser:"@@?"`
	OrderBy  *SelectOrderByClause `parser:"@@?"`
	Limit    *LimitClause         `parser:"@@?"`
	Settings *SettingsClause      `parser:"@@?"`
}

type SetDefaultRoleStmt struct {
	None      bool      `parser:"'SET' 'DEFAULT' 'ROLE' (@'NONE'"`
	All       bool      `parser:"| @'ALL'"`
	Roles     *RoleList `parser:"| @@"`
	AllExcept *RoleList `parser:"| 'ALL' 'EXCEPT' @@)"`
	ToUsers   []string  `parser:"'TO' @(Ident | BacktickIdent) (',' @(Ident | BacktickIdent))*"`
	Semicolon bool      `parser:"';'"`
}

type SetRoleStmt struct {
	Default   bool      `parser:"'SET' 'ROLE' (@'DEFAULT'"`
	None      bool      `parser:"| @'NONE'"`
	All       bool      `parser:"| @'ALL'"`
	AllExcept *RoleList `parser:"| 'ALL' 'EXCEPT' @@"`
	Roles     *RoleList `parser:"| @@)"`
	Semicolon bool      `parser:"';'"`
}

type SettingsAssignment struct {
	Key   string     `parser:"@(Ident | BacktickIdent)"`
	Value Expression `parser:"'=' @@"`
}

type SettingsClause struct {
	Settings string               `parser:"'SETTINGS'"`
	Values   []SettingsAssignment `parser:"@@ (',' @@)*"`
}

type SimpleComparison struct {
	Op       *SimpleComparisonOp `parser:"@@"`
	Addition *AdditionExpression `parser:"@@"`
}

type SimpleComparisonOp struct {
	Eq      bool `parser:"@'='"`
	NotEq   bool `parser:"| @'!=' | @'<>'"`
	LtEq    bool `parser:"| @'<='"`
	GtEq    bool `parser:"| @'>='"`
	Lt      bool `parser:"| @'<'"`
	Gt      bool `parser:"| @'>'"`
	Like    bool `parser:"| @'LIKE'"`
	NotLike bool `parser:"| @('NOT' 'LIKE')"`
}

type SimpleDSLParam struct {
	Name  string     `parser:"@(Ident | BacktickIdent | 'USER' | 'PASSWORD' | 'VALUE' | 'NAME')"`
	Value Expression `parser:"@@"`
}

type SimpleParameter struct {
	Name       string     `parser:"@(Ident | BacktickIdent)"`
	Expression Expression `parser:"@@"`
}

type SimpleType struct {
	Name       string          `parser:"@(Ident | BacktickIdent)"`
	Parameters []TypeParameter `parser:"('(' @@ (',' @@)* ')')?"`
}

type Statement struct {
	CommentStatement      *CommentStatement          `parser:"@@"`
	CreateDatabase        *CreateDatabaseStmt        `parser:"| @@"`
	AlterDatabase         *AlterDatabaseStmt         `parser:"| @@"`
	AttachDatabase        *AttachDatabaseStmt        `parser:"| @@"`
	DetachDatabase        *DetachDatabaseStmt        `parser:"| @@"`
	DropDatabase          *DropDatabaseStmt          `parser:"| @@"`
	RenameDatabase        *RenameDatabaseStmt        `parser:"| @@"`
	CreateTable           *CreateTableStmt           `parser:"| @@"`
	AlterTable            *AlterTableStmt            `parser:"| @@"`
	CreateDictionary      *CreateDictionaryStmt      `parser:"| @@"`
	CreateView            *CreateViewStmt            `parser:"| @@"`
	CreateNamedCollection *CreateNamedCollectionStmt `parser:"| @@"`
	AlterNamedCollection  *AlterNamedCollectionStmt  `parser:"| @@"`
	CreateRole            *CreateRoleStmt            `parser:"| @@"`
	AlterRole             *AlterRoleStmt             `parser:"| @@"`
	DropRole              *DropRoleStmt              `parser:"| @@"`
	SetRole               *SetRoleStmt               `parser:"| @@"`
	SetDefaultRole        *SetDefaultRoleStmt        `parser:"| @@"`
	Grant                 *GrantStmt                 `parser:"| @@"`
	Revoke                *RevokeStmt                `parser:"| @@"`
	CreateFunction        *CreateFunctionStmt        `parser:"| @@"`
	DropFunction          *DropFunctionStmt          `parser:"| @@"`
	AttachView            *AttachViewStmt            `parser:"| @@"`
	AttachDictionary      *AttachDictionaryStmt      `parser:"| @@"`
	DetachView            *DetachViewStmt            `parser:"| @@"`
	DetachDictionary      *DetachDictionaryStmt      `parser:"| @@"`
	DropView              *DropViewStmt              `parser:"| @@"`
	DropDictionary        *DropDictionaryStmt        `parser:"| @@"`
	DropNamedCollection   *DropNamedCollectionStmt   `parser:"| @@"`
	AttachTable           *AttachTableStmt           `parser:"| @@"`
	DetachTable           *DetachTableStmt           `parser:"| @@"`
	DropTable             *DropTableStmt             `parser:"| @@"`
	RenameTable           *RenameTableStmt           `parser:"| @@"`
	RenameDictionary      *RenameDictionaryStmt      `parser:"| @@"`
	SelectStatement       *TopLevelSelectStatement   `parser:"| @@"`
}

type Subquery struct {
	OpenParen  string          `parser:"'('"`
	SelectStmt SelectStatement `parser:"@@"`
	CloseParen string          `parser:"')'"`
}

type SubqueryWithAlias struct {
	Subquery SelectStatement `parser:"'(' @@ ')'"`
	Alias    *string         `parser:"('AS' @(Ident | BacktickIdent))?"`
}

type TTLClause struct {
	TTL        string     `parser:"'TTL'"`
	Expression Expression `parser:"@@"`
}

type TTLDelete struct {
	Delete string      `parser:"'DELETE'"`
	Where  *Expression `parser:"('WHERE' @@)?"`
}

type TableAlias struct {
	Name *string `parser:"'AS' @(Ident | BacktickIdent)"`
}

type TableClause struct {
	LeadingComments  []string             `parser:"@(Comment | MultilineComment)*"`
	OrderBy          *OrderByClause       `parser:"@@"`
	PartitionBy      *PartitionByClause   `parser:"| @@"`
	PrimaryKey       *PrimaryKeyClause    `parser:"| @@"`
	SampleBy         *SampleByClause      `parser:"| @@"`
	TTL              *TableTTLClause      `parser:"| @@"`
	Settings         *TableSettingsClause `parser:"| @@"`
	TrailingComments []string             `parser:"@(Comment | MultilineComment)*"`
}

type TableElement struct {
	Index      *IndexDefinition      `parser:"@@"`
	Constraint *ConstraintDefinition `parser:"| @@"`
	Projection *ProjectionDefinition `parser:"| @@"`
	Column     *Column               `parser:"| @@"`
}

type TableEngine struct {
	Engine           string            `parser:"'ENGINE' '='"`
	Name             string            `parser:"@(Ident | BacktickIdent)"`
	Parameters       []EngineParameter `parser:"('(' (@@ (',' @@)*)? ')')?"`
	TrailingComments []string          `parser:"@(Comment | MultilineComment)*"`
}

type TableFunction struct {
	Name      string        `parser:"@(Ident | BacktickIdent)"`
	Arguments []FunctionArg `parser:"'(' (@@ (',' @@)*)? ')'"`
}

type TableNameWithAlias struct {
	Database      *string     `parser:"(@(Ident | BacktickIdent) '.')?"`
	Table         string      `parser:"@(Ident | BacktickIdent)"`
	ExplicitAlias *TableAlias `parser:"@@?"`
	ImplicitAlias *string     `parser:"| @(Ident | BacktickIdent)"`
}

type TableRef struct {
	// Try table function first (has parentheses to distinguish it)
	Function *FunctionWithAlias `parser:"@@"`
	// OR subquery with optional alias
	Subquery *SubqueryWithAlias `parser:"| @@"`
	// Fall back to table reference if no function call syntax found
	TableName *TableNameWithAlias `parser:"| @@"`
}

type TableReference struct {
	Database *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	Table    string  `parser:"@(Ident | BacktickIdent)"`
}

type TableRename struct {
	FromDatabase *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	FromName     string  `parser:"@(Ident | BacktickIdent)"`
	To           string  `parser:"'TO'"`
	ToDatabase   *string `parser:"(@(Ident | BacktickIdent) '.')?"`
	ToName       string  `parser:"@(Ident | BacktickIdent)"`
}

type TableSetting struct {
	Name  string `parser:"@(Ident | BacktickIdent)"`
	Eq    string `parser:"'='"`
	Value string `parser:"@(String | Number | Ident | BacktickIdent)"`
}

type TableSettingsClause struct {
	Settings []TableSetting `parser:"'SETTINGS' @@ (',' @@)*"`
}

type TableSource struct {
	// Try table function first (has parentheses to distinguish it)
	Function *TableFunction `parser:"@@"`
	// Fall back to table reference if no function call syntax found
	TableRef *TableReference `parser:"| @@"`
}

type TableTTLClause struct {
	TTL        string     `parser:"'TTL'"`
	Expression Expression `parser:"@@"`
}

type TopLevelSelectStatement struct {
	SelectStatement
	Semicolon bool `parser:"';'"`
}

type TrailingCommentField struct {
	TrailingComments []string `parser:"@(Comment | MultilineComment)*"`
}

type TupleElement struct {
	// Try to parse name + type first, then fall back to just type
	Name *string   `parser:"@(Ident | BacktickIdent)"`
	Type *DataType `parser:"@@"`
	// For unnamed tuples, we just have the type
	UnnamedType *DataType `parser:"| @@"`
}

type TupleExpression struct {
	Elements []Expression `parser:"'(' (@@ (',' @@)*)? ')'"`
}

type TupleType struct {
	Tuple    string         `parser:"'Tuple' '('"`
	Elements []TupleElement `parser:"@@ (',' @@)*"`
	Close    string         `parser:"')'"`
}

type TypeParameter struct {
	Function *ParametricFunction `parser:"@@"`
	Number   *string             `parser:"| @Number"`
	String   *string             `parser:"| @String"`
	Ident    *string             `parser:"| @(Ident | BacktickIdent)"`
}

type UnaryExpression struct {
	Op      string             `parser:"@('+' | '-')?"`
	Primary *PrimaryExpression `parser:"@@"`
}

type UpdateOperation struct {
	Update     string      `parser:"'UPDATE'"`
	Column     string      `parser:"@(Ident | BacktickIdent)"`
	Eq         string      `parser:"'='"`
	Expression Expression  `parser:"@@"`
	Where      *Expression `parser:"('WHERE' @@)?"`
}

type ViewEngine struct {
	Engine      string            `parser:"'ENGINE' '='"`
	Name        string            `parser:"@(Ident | BacktickIdent)"`
	Parameters  []EngineParameter `parser:"('(' (@@ (',' @@)*)? ')')?"`
	OrderBy     *ViewOrderBy      `parser:"@@?"`
	PartitionBy *ViewPartitionBy  `parser:"@@?"`
	PrimaryKey  *ViewPrimaryKey   `parser:"@@?"`
	SampleBy    *ViewSampleBy     `parser:"@@?"`
}

type ViewOrderBy struct {
	OrderBy    string     `parser:"'ORDER' 'BY'"`
	Expression Expression `parser:"@@"`
}

type ViewPartitionBy struct {
	PartitionBy string     `parser:"'PARTITION' 'BY'"`
	Expression  Expression `parser:"@@"`
}

type ViewPrimaryKey struct {
	PrimaryKey string     `parser:"'PRIMARY' 'KEY'"`
	Expression Expression `parser:"@@"`
}

type ViewSampleBy struct {
	SampleBy   string     `parser:"'SAMPLE' 'BY'"`
	Expression Expression `parser:"@@"`
}

type ViewTableTarget struct {
	// Try table function first (has parentheses to distinguish it)
	Function *TableFunction `parser:"@@"`
	// Fall back to table reference if no function call syntax found
	Database *string `parser:"| ((@(Ident | BacktickIdent) '.')?"`
	Table    *string `parser:"@(Ident | BacktickIdent))"`
}

type WhenClause struct {
	When      string `parser:"'WHEN'"`
	Condition string `parser:"@(~'THEN')+"`
	Then      string `parser:"'THEN'"`
	Result    string `parser:"@(~('WHEN' | 'ELSE' | 'END'))+"`
}

type WhereClause struct {
	Where     string     `parser:"'WHERE'"`
	Condition Expression `parser:"@@"`
}

type WindowFrame struct {
	Type    string      `parser:"@('ROWS' | 'RANGE')"`
	Between bool        `parser:"@'BETWEEN'?"`
	Start   FrameBound  `parser:"@@"`
	End     *FrameBound `parser:"('AND' @@)?"`
}

type WithClause struct {
	With string                  `parser:"'WITH'"`
	CTEs []CommonTableExpression `parser:"@@ (',' @@)*"`
}