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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