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https://issues.apache.org/jira/browse/CALCITE-3219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907211#comment-16907211
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Pressenna commented on CALCITE-3219:
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created https://github.com/apache/calcite/pull/1378 for the changes, which I
would use as a discussion basis.
> 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
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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