rubenada opened a new pull request #1613: [CALCITE-3542] Implement RepeatUnion All=false URL: https://github.com/apache/calcite/pull/1613 Jira ticket: [CALCITE-3542](https://issues.apache.org/jira/browse/CALCITE-3542) Previously, [CALCITE-2812](https://issues.apache.org/jira/browse/CALCITE-2812) introduced recursive queries in Calcite via the new operator RepeatUnion. However, this initial implementation was not complete, since it only provided RepeatUnion ALL (i.e. duplicates were returned). The current PR aims to implement the missing feature: RepeatUnion non-ALL (i.e. duplicates must be discarded).
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