Package org.apache.calcite.adapter.druid

Class DruidRules.DruidProjectRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.adapter.druid.DruidRules.DruidProjectRule

Enclosing class:

DruidRules

public static class DruidRules.DruidProjectRule
extends RelOptRule

Rule to push a Project into a DruidQuery.

Field Summary

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor	Description
DruidProjectRule(RelBuilderFactory relBuilderFactory)	Creates a DruidProjectRule.

Method Summary

Modifier and Type	Method	Description
void	onMatch(RelOptRuleCall call)	Receives notification about a rule match.
private static Pair<java.util.List<RexNode>,java.util.List<RexNode>>	splitProjects(RexBuilder rexBuilder, RelNode input, java.util.List<RexNode> nodes)

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

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DruidProjectRule

public DruidProjectRule(RelBuilderFactory relBuilderFactory)

Creates a DruidProjectRule.

Parameters:

relBuilderFactory - Builder for relational expressions

Method Detail

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 class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)

splitProjects

private static Pair<java.util.List<RexNode>,java.util.List<RexNode>> splitProjects(RexBuilder rexBuilder,
                                                                                         RelNode input,
                                                                                         java.util.List<RexNode> nodes)