Botong Huang created CALCITE-4514:
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Summary: Prefer merge new relset into old relset when they are
parent set of each other
Key: CALCITE-4514
URL: https://issues.apache.org/jira/browse/CALCITE-4514
Project: Calcite
Issue Type: Improvement
Reporter: Botong Huang
When merging two relsets, we have two preferences:
1. Merge parent relset into child relset
2. Merge newer relset into older relset
Currently, when the two relsets are parent set of each other, we randomly pick
a merge order without checking the second condition above. For performance
reasons, we should, to avoid unnecessary churn.
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