[CALCITE-3756] RelSubset should not match operand(RelNode.class) - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 1.22.0
Component/s: core
Labels:
- pull-request-available

Description

Even RelSubset is a subclass of RelNode, but they are quite different. RelNode already fires these rules, it is not necessary to fire for RelSubset. More importantly, it never worked due to ~~CALCITE-3755~~.
In addition, it will waste time to try to iterate class operands of RelSubset and try to match pattern operand(RelNode), given that it never matches when ascending.