[jira] [Updated] (CALCITE-4907) JDBC adapter cannot push down join ON TRUE (cartesian product) or ON FALSE

["Francesco Gini (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francesco Gini updated CALCITE-4907:
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    Summary:  JDBC adapter cannot push down join ON TRUE (cartesian product) or ON FALSE  (was: JdbcJoin does not convert Join with always true/false RexNode)

>  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
>
> Cross joins (LogicalJoin with condition {_}true{_}) are not pushed down in the database when using the JdbcAdapter. This results in implementing the join in memory via _EnumerableNestedLoopJoin_ which is a less efficient implementation.
>  
> 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).



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