[CALCITE-442] Add RelOptRuleOperand constructor that takes a predicate

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.2-incubating
• Assignee: Julian Hyde
• Reporter: Julian Hyde
• Created: 22/Oct/14 20:01
• Updated: 02/Sep/15 01:02
• Resolved: 23/Oct/14 20:52

Description

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.