Class PushDownDereferencesThroughWindow
- java.lang.Object
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- io.prestosql.sql.planner.iterative.rule.PushDownDereferencesThroughWindow
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- All Implemented Interfaces:
Rule<ProjectNode>
public class PushDownDereferencesThroughWindow extends Object implements Rule<ProjectNode>
Transforms:Project(G := f1(A.x), H := f2(B.x), J := f3(C.x), K := f4(D.x), L := f5(F)) Window(orderBy = [B], partitionBy = [C], min_D := min(D)) Source(A, B, C, D, E, F)
to:Project(G := f1(symbol), H := f2(B.x), J := f3(C.x), K := f4(D.x), L := f5(F)) Window(orderBy = [B], partitionBy = [C], min_D := min(D)) Project(A, B, C, D, E, F, symbol := A.x) Source(A, B, C, D, E, F)
Pushes down dereference projections through Window. Excludes dereferences on symbols in ordering scheme and partitionBy to avoid data replication, since these symbols cannot be pruned.
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Nested Class Summary
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Nested classes/interfaces inherited from interface io.prestosql.sql.planner.iterative.Rule
Rule.Context, Rule.Result
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Constructor Summary
Constructors Constructor Description PushDownDereferencesThroughWindow(TypeAnalyzer typeAnalyzer)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Rule.Result
apply(ProjectNode projectNode, Captures captures, Rule.Context context)
Pattern<ProjectNode>
getPattern()
Returns a pattern to which plan nodes this rule applies.
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Constructor Detail
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PushDownDereferencesThroughWindow
public PushDownDereferencesThroughWindow(TypeAnalyzer typeAnalyzer)
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Method Detail
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getPattern
public Pattern<ProjectNode> getPattern()
Description copied from interface:Rule
Returns a pattern to which plan nodes this rule applies.- Specified by:
getPattern
in interfaceRule<ProjectNode>
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apply
public Rule.Result apply(ProjectNode projectNode, Captures captures, Rule.Context context)
- Specified by:
apply
in interfaceRule<ProjectNode>
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