Documentation
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Overview ¶
Package ddl holds the materialized-view index generator — the Go port of Java's MaterializedViewIndexGenerator (RFC-202). It is the single producer of index metadata from `CREATE INDEX … AS SELECT` (and, via the ON-source front end, `CREATE INDEX … ON t(cols)`) declarations: it consumes the logical plan the ordinary query front end built for the index's SELECT and emits the index's root key expression, type, and options.
Java reference (tag 4.12.11.0): fdb-relational-core/.../recordlayer/query/ddl/MaterializedViewIndexGenerator.java
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type GeneratedIndex ¶
type GeneratedIndex struct {
// TableName is the record type the index is over — Java's
// getRecordTypeName() (MaterializedViewIndexGenerator.java:791-801).
TableName string
// Root is the index's root key expression.
Root recordlayer.KeyExpression
// IndexType is a recordlayer.IndexType* constant ("" never happens; the
// value arm emits VALUE or VERSION, the aggregate arm its own type).
IndexType string
// Options carries generator-owned options (PERMUTED_SIZE for permuted
// min/max). May be nil.
Options map[string]string
// Predicate is the sparse-index predicate proto for a WHERE-carrying
// definition (getTopLevelPredicate → IndexPredicate.fromQueryPredicate,
// MaterializedViewIndexGenerator.java:169-172). Nil for a full index.
Predicate *gen.Predicate
}
GeneratedIndex is the generator's output: everything the metadata builder needs to materialise the index. Mirrors the RecordLayerIndex.Builder state Java's generator fills in (name/table/type/unique are the caller's; the generator owns root expression, index type and options).
func Generate ¶
func Generate(op logical.LogicalOperator, md *recordlayer.RecordMetaData, opts Options) (*GeneratedIndex, error)
Generate is the entry point: op is the logical plan of the index's SELECT as produced by the catalog-aware plan visitor (and its post-passes), md the metadata the SELECT was planned against.
Ports MaterializedViewIndexGenerator.generate (MaterializedViewIndexGenerator.java:149-246): the value/version arm is generateValue, the aggregate arm (:204-244) generateAggregate.
type Options ¶
type Options struct {
// UseLegacyExtremumEver is Java's useLegacyBasedExtremumEver: `WITH
// ATTRIBUTES LEGACY_EXTREMUM_EVER` selects the LONG-based extremum
// maintainer (MIN_EVER_LONG / MAX_EVER_LONG) instead of the tuple-based
// one (MaterializedViewIndexGenerator.java:449-465).
UseLegacyExtremumEver bool
}
Options carries the caller-side switches Java threads into MaterializedViewIndexGenerator.from (DdlVisitor.java:214-216).
Source Files