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…ng aggregate Add AggregateUnionNullBranchRule as CoreRules.AGGREGATE_UNION_NULL_BRANCH. A UNION ALL branch is irrelevant to an enclosing aggregate when every aggregate call ignores NULLs, for example, SUM, SUM0, MIN, MAX, AVG, COUNT(col), and reads a column that the branch produces as constant NULL. Without GROUP BY the branch is removed, but at least one branch is kept. With GROUP BY the branch is kept because it contributes group keys, but a redundant pure GROUP BY inside it is removed. COUNT(*), other aggregates, and UNION distinct are not affected.
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Add AggregateUnionNullBranchRule as CoreRules.AGGREGATE_UNION_NULL_BRANCH. A UNION ALL branch is irrelevant to an enclosing aggregate when every aggregate call ignores NULLs, for example, SUM, SUM0, MIN, MAX, AVG, COUNT(col), and reads a column that the branch produces as constant NULL.
Without GROUP BY the branch is removed, but at least one branch is kept. With GROUP BY the branch is kept because it contributes group keys, but a redundant pure GROUP BY inside it is removed.
COUNT(*), other aggregates, and UNION distinct are not affected.
Jira Link
CALCITE-7912