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https://issues.apache.org/jira/browse/CALCITE-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17453641#comment-17453641
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Julian Hyde commented on CALCITE-4907:
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You say “done” but I only see one commit in the PR
RelNode and RexNode are typesafe. The ON of a Join is always BOOLEAN.
> JDBC adapter cannot push down join ON TRUE (cartesian product) or ON FALSE
> ---------------------------------------------------------------------------
>
> Key: CALCITE-4907
> URL: https://issues.apache.org/jira/browse/CALCITE-4907
> Project: Calcite
> Issue Type: Bug
> Components: jdbc-adapter
> Affects Versions: 1.28.0
> Reporter: Francesco Gini
> Assignee: Francesco Gini
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.29.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> JDBC adapter (in JdbcJoinRule) cannot push down join ON TRUE (cartesian
> product) or ON FALSE. This results in implementing the join in memory via
> _EnumerableNestedLoopJoin_ which is a less efficient implementation.
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