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https://issues.apache.org/jira/browse/CALCITE-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17450184#comment-17450184
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Julian Hyde commented on CALCITE-4907:
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Can you describe how this issue looks from the perspective of the end user?
> JdbcJoin does not convert Join with always true/false RexNode
> -------------------------------------------------------------
>
> 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
>
>
> JdbcJoin does not handle cases where the condtion is a RexNode that it is
> always true or false. However, SqlImplementor is coded to handle those
> conditions (see SqlImplementor.convertConditionToSqlNode).
> Specifically a cross join is internally represented as a LogicalJoin with
> condition true which is not pushed down into the db.
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