Class PushDownDereferenceThroughFilter
- java.lang.Object
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- io.prestosql.sql.planner.iterative.rule.PushDownDereferenceThroughFilter
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- All Implemented Interfaces:
Rule<ProjectNode>
public class PushDownDereferenceThroughFilter extends Object implements Rule<ProjectNode>
Transforms:Project(D := f1(A.x), E := f2(B), G := f3(C)) Filter(A.x.y = 5 AND B.m = 3) Source(A, B, C)
to:Project(D := f1(expr), E := f2(B), G := f3(C)) Filter(expr.y = 5 AND B.m = 3) Project(A, B, C, expr := A.x) Source(A, B, C)
Pushes down dereference projections in project node assignments and filter node predicate.
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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 PushDownDereferenceThroughFilter(TypeAnalyzer typeAnalyzer)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Rule.Result
apply(ProjectNode node, 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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PushDownDereferenceThroughFilter
public PushDownDereferenceThroughFilter(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 node, Captures captures, Rule.Context context)
- Specified by:
apply
in interfaceRule<ProjectNode>
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