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  1. Calcite
  2. CALCITE-3219

Allow finer control over which expressions get expanded in SqlToRelConverter

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None

      Description

      Currently one can control if sub-query expansion happens via SqlToRelConverter.Config.isExpand(). This flag is global to the query and causes expansion of all supported expression types. For some systems it is required that one can dynamically narrow the set of expressions that should be expanded.

      In order to allow this, I would propose a new setter with a default implementation that returns the above flag.

      // a BiPredicate in order to pass both the original query and the expression in question for expansion
      java.util.function.BiPredicate<SqlNode, SqlNode> SqlToRelConverter.Config.getExpandPredicate()
      

      If this is OK, I would provide a PR with the relevant changes.

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              • Assignee:
                Unassigned
                Reporter:
                psockali Pressenna
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