compiler

type ColumnStatistics struct {
	ColumnName   string
	Cardinality  int64
	AvgLength    int32
	NullCount    int64
	DistinctVals int64
}

type CompilerConfig struct {
	// 选项
	Options CompilerOptions

	// 优化器列表
	Optimizers []Optimizer

	// 查询计划器
	Planner Planner

	// 自定义SQL转换函数
	CustomTransformers map[string]func(string) string
}

type CompilerOptions struct {
	// 方言
	Dialect string

	// 是否启用优化
	EnableOptimization bool

	// 是否启用查询计划
	EnablePlanning bool

	// 最大查询复杂度
	MaxQueryComplexity int

	// 是否启用参数化查询
	EnableParameterization bool

	// 是否启用查询缓存
	EnableQueryCache bool
}

type CompositeOptimizer struct {
	// contains filtered or unexported fields
}

type DefaultCompiler struct {
	// contains filtered or unexported fields
}

type DialectCompiler struct {
	// contains filtered or unexported fields
}

type GroupByOptimizer struct {
	// contains filtered or unexported fields
}

type JoinOptimizer struct {
	// contains filtered or unexported fields
}

type Optimizer interface {
	// Optimize 优化SQL执行上下文
	Optimize(execCtx *executor.ExecutionContext) (*executor.ExecutionContext, error)

	// GetName 获取优化器名称
	GetName() string
}

type OrderByOptimizer struct {
	// contains filtered or unexported fields
}

type Planner interface {
	// Plan 生成查询执行计划
	Plan(execCtx *executor.ExecutionContext) (*QueryPlan, error)

	// Analyze 分析查询性能
	Analyze(execCtx *executor.ExecutionContext) map[string]interface{}
}

type QueryPlan struct {
	// 原始SQL
	OriginalSQL string

	// 优化后的SQL
	OptimizedSQL string

	// 执行策略
	Strategy string

	// 估计成本
	EstimatedCost float64

	// 索引建议
	IndexHints []string

	// 优化说明
	Explanation string
}

type SQLCompiler interface {
	// Compile 编译执行上下文为SQL语句
	Compile(execCtx *executor.ExecutionContext) (string, []interface{}, error)

	// GetDialect 获取当前方言
	GetDialect() string

	// SetDialect 设置方言
	SetDialect(dialect string) error
}

type SelectOptimizer struct {
	// contains filtered or unexported fields
}

type SimplePlanner struct {
	// contains filtered or unexported fields
}

type StatisticPlanner struct {
	// contains filtered or unexported fields
}

type TableStatistics struct {
	TableName  string
	RowCount   int64
	ColumnStat map[string]ColumnStatistics
}

type WhereOptimizer struct {
	// contains filtered or unexported fields
}