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https://issues.apache.org/jira/browse/CALCITE-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chunwei Lei resolved CALCITE-4203.
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Fix Version/s: 1.26.0
Resolution: Fixed
Fixed in
https://github.com/apache/calcite/commit/103430bcc76ed1a7cbab6861ecdd39814cf4ef83.
> RelMdUniqueKeys should not return empty when meeting Intersect and Minus if
> its input has unique keys
> -----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-4203
> URL: https://issues.apache.org/jira/browse/CALCITE-4203
> Project: Calcite
> Issue Type: Improvement
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.26.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Currently, we get an empty unique key for Intersect and Minus if its all is
> true.
>
> {code:java}
> // code placeholder
> public Set<ImmutableBitSet> getUniqueKeys(SetOp rel, RelMetadataQuery mq,
> boolean ignoreNulls) {
> if (!rel.all) {
> return ImmutableSet.of(
> ImmutableBitSet.range(rel.getRowType().getFieldCount()));
> }
> return ImmutableSet.of();
> }
> {code}
> However, from the semantic of Intersect and Minus, we can get their unique
> keys from its input even if its all is true.
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