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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