Package org.apache.calcite.rel.rules
Class ProjectRemoveRule
- java.lang.Object
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- org.apache.calcite.plan.RelOptRule
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- org.apache.calcite.rel.rules.ProjectRemoveRule
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public class ProjectRemoveRule extends RelOptRule
Planner rule that, given aProject
node that merely returns its input, converts the node into its child.For example,
Project(ArrayReader(a), {$input0})
becomesArrayReader(a)
.- See Also:
CalcRemoveRule
,ProjectMergeRule
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Field Summary
Fields Modifier and Type Field Description static ProjectRemoveRule
INSTANCE
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Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
Constructors Constructor Description ProjectRemoveRule(RelBuilderFactory relBuilderFactory)
Creates a ProjectRemoveRule.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description static boolean
isIdentity(java.util.List<? extends RexNode> exps, RelDataType childRowType)
Deprecated.static boolean
isTrivial(Project project)
void
onMatch(RelOptRuleCall call)
Receives notification about a rule match.static RelNode
strip(Project project)
Returns the child of a project if the project is trivial, otherwise the project itself.-
Methods inherited from class org.apache.calcite.plan.RelOptRule
any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered
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Field Detail
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INSTANCE
public static final ProjectRemoveRule INSTANCE
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Constructor Detail
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ProjectRemoveRule
public ProjectRemoveRule(RelBuilderFactory relBuilderFactory)
Creates a ProjectRemoveRule.- Parameters:
relBuilderFactory
- Builder for relational expressions
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Method Detail
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onMatch
public void onMatch(RelOptRuleCall call)
Description copied from class:RelOptRule
Receives notification about a rule match. At the time that this method is called,call.rels
holds the set of relational expressions which match the operands to the rule;call.rels[0]
is the root expression.Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back
RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>)
to register the expression.- Specified by:
onMatch
in classRelOptRule
- Parameters:
call
- Rule call- See Also:
RelOptRule.matches(RelOptRuleCall)
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strip
public static RelNode strip(Project project)
Returns the child of a project if the project is trivial, otherwise the project itself.
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isTrivial
public static boolean isTrivial(Project project)
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isIdentity
@Deprecated public static boolean isIdentity(java.util.List<? extends RexNode> exps, RelDataType childRowType)
Deprecated.
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