public class FilterToCalcRule extends RelOptRule
LogicalFilter
to a
LogicalCalc
.
The rule does NOT fire if the child is a
LogicalFilter
or a
LogicalProject
(we assume they they
will be converted using FilterToCalcRule
or
ProjectToCalcRule
) or a
LogicalCalc
. This
LogicalFilter
will eventually be
converted by FilterCalcMergeRule
.
Modifier and Type | Field and Description |
---|---|
static FilterToCalcRule |
INSTANCE |
description, operands, relBuilderFactory
Constructor and Description |
---|
FilterToCalcRule(RelBuilderFactory relBuilderFactory)
Creates a FilterToCalcRule.
|
Modifier and Type | Method and Description |
---|---|
void |
onMatch(RelOptRuleCall call)
Receives notification about a rule match.
|
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
public static final FilterToCalcRule INSTANCE
public FilterToCalcRule(RelBuilderFactory relBuilderFactory)
relBuilderFactory
- Builder for relational expressionspublic void onMatch(RelOptRuleCall call)
RelOptRule
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.
onMatch
in class RelOptRule
call
- Rule callRelOptRule.matches(RelOptRuleCall)
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