[jira] [Created] (CALCITE-3219) allow finer control over which expressions get expanded in SqlToRelConverter

["Pressenna (JIRA)" <ji...@apache.org>]

Pressenna created CALCITE-3219:
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             Summary: allow finer control over which expressions get expanded in SqlToRelConverter
                 Key: CALCITE-3219
                 URL: https://issues.apache.org/jira/browse/CALCITE-3219
             Project: Calcite
          Issue Type: Improvement
            Reporter: Pressenna


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.

{code}
// 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()
{code}


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




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