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https://issues.apache.org/jira/browse/CALCITE-4356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17220604#comment-17220604
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Ruben Q L commented on CALCITE-4356:
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You're rigth [~zabetak], I'll link the current ticket as blocked by CALCITE-129.
> Support recursive queries in SqlToRel and RelToSql converters
> -------------------------------------------------------------
>
> Key: CALCITE-4356
> URL: https://issues.apache.org/jira/browse/CALCITE-4356
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Ruben Q L
> Priority: Major
>
> Recursive queries were introduced via RepeatUnion operator (CALCITE-2812).
> However, for the moment they can only be generated using directly a
> RelBuilder. The purpose of this ticket it to support then on SQL by evolving
> SqlToRelConverter (and RelToSqlConverter).
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