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Posted to issues@spark.apache.org by "Maryann Xue (JIRA)" <ji...@apache.org> on 2018/11/14 17:02:00 UTC

[jira] [Created] (SPARK-26065) Change query hint from a `LogicalPlan` to a field

Maryann Xue created SPARK-26065:
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             Summary: Change query hint from a `LogicalPlan` to a field
                 Key: SPARK-26065
                 URL: https://issues.apache.org/jira/browse/SPARK-26065
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Maryann Xue


The existing query hint implementation relies on a logical plan node {{ResolvedHint}} to store query hints in logical plans, and on {{Statistics}} in physical plans. Since {{ResolvedHint}} is not really a logical operator and can break the pattern matching for existing and future optimization rules, it is a issue to the Optimizer as the old {{AnalysisBarrier}} to the Analyzer.

Given the fact that all our query hints are either 1) a join hint, i.e., broadcast hint; or 2) a re-partition hint, which is indeed an operator, we only need to add a hint field on the {{Join}} plan and that will be a good enough solution for current hint usage.



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