Julian Hyde created CALCITE-442:
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Summary: Add RelOptRuleOperand constructor that takes a predicate
Key: CALCITE-442
URL: https://issues.apache.org/jira/browse/CALCITE-442
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Currently if you want a rule operand to only match certain relational
expressions you must sub-class RelOptRuleOperand and change the {{boolean
matches(RelNode)}} method.
We should add a constructor RelOptRuleOperand that takes a predicate (a
function that returns a boolean). Then sub-classing will not be necessary.
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