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https://issues.apache.org/jira/browse/HIVE-25046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis reassigned HIVE-25046:
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> Log CBO plans right after major transformations
> -----------------------------------------------
>
> Key: HIVE-25046
> URL: https://issues.apache.org/jira/browse/HIVE-25046
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> Currently the results of various CBO transformations are logged (in DEBUG
> mode) at the end of the optimization
> [phase|https://github.com/apache/hive/blob/9f5bd72e908244b2fe915e8dc39f55afa94bbffa/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L2106]
> and only if we are not in test mode. This has some disadvantages:
> * If there is a failure (exception) in some intermediate step we will miss
> all the intermediate plans, possibly losing track of what plan led to the
> problem.
> * Intermediate logs are very useful for identifying plan problems while
> working on a patch; unfortunately the logs are explicitly disabled in test
> mode which means that in order to appear the respective code needs to change
> every time we need to see those logs.
> * Logging at the end necessitates keeping additional local variables that
> make code harder to read.
> The goal of this issue is to place DEBUG logging right after major
> transformations and independently if we are running in test mode or not to
> alleviate the shortcomings mentioned above.
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