Alessandro Solimando created HIVE-25938:
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Summary: Print in EXPLAIN CBO which rules are excluded from
planning
Key: HIVE-25938
URL: https://issues.apache.org/jira/browse/HIVE-25938
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 4.0.0
Reporter: Alessandro Solimando
HIVE-25880 introduced a configuration parameter for excluding CBO rules based
on a regex on their description.
Calcite logs when a rule is excluded (see
[AbstractRelOptPlanner.java#L316|https://github.com/apache/calcite/blob/e42b85a45bd16dd58db1546736e653deda5463fe/core/src/main/java/org/apache/calcite/plan/AbstractRelOptPlanner.java#L316]
and
[VolcanoRuleCall.java#L169|https://github.com/apache/calcite/blob/e42b85a45bd16dd58db1546736e653deda5463fe/core/src/main/java/org/apache/calcite/plan/volcano/VolcanoRuleCall.java#L169]).
To ease investigations, this should be complemented by printing the regex used
(if not blank) in Hive DEBUG logs, and the same in CBO information (i.e.,
EXPLAIN CBO's output).
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