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https://issues.apache.org/jira/browse/CALCITE-4166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa updated CALCITE-4166:
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Attachment: RelMdDistributionTest.java
> UnsupportedOperationException when getting distribution in metadata quey
> ------------------------------------------------------------------------
>
> Key: CALCITE-4166
> URL: https://issues.apache.org/jira/browse/CALCITE-4166
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0, 1.24.0
> Reporter: Krisztian Kasa
> Priority: Major
> Attachments: RelMdDistributionTest.java
>
>
> The RelDistribution is calculated by:
> 1. Get the Project input's RelDistribution. If it is a TableScan which scans
> a partitioned table the returned RelDistribution object contains the indexes
> of partition columns like: RelDistribution(hash[0, 4])
> 2. If the project contains these columns we need a mapping to map the key
> indexes in the RelDistribution.
> Mapping is generated here:
> https://github.com/apache/calcite/blob/b3b3e06eef7eeedf2de32b44d061af7867633be6/core/src/main/java/org/apache/calcite/rel/metadata/RelMdDistribution.java#L164
> This mapping is an INVERSE_FUNCTION
> [https://github.com/apache/calcite/blob/2088488ac8327b19512a76a122cae2961fc551c3/core/src/main/java/org/apache/calcite/rel/core/Project.java#L375]
> which does not support *getTargetOpt*
> Stack trace from UT I created to reproduce the issue in Calcite:
> {code}
> [0;31;1mFAILURE[0m [0;1m 2.1sec[0m,
> org.apache.calcite.rel.metadata.[0;1mRelMdDistributionTest[0m >
> [0;1mtest()[0m
> java.lang.UnsupportedOperationException
> at
> org.apache.calcite.util.mapping.Mappings$AbstractMapping.getSourceOpt(Mappings.java:913)
> at
> org.apache.calcite.util.mapping.Mappings$InverseMapping.getTargetOpt(Mappings.java:1800)
> at
> org.apache.calcite.rel.RelDistributions$RelDistributionImpl.apply(RelDistributions.java:145)
> at
> org.apache.calcite.rel.metadata.RelMdDistribution.project(RelMdDistribution.java:166)
> at
> org.apache.calcite.rel.metadata.RelMdDistribution.distribution(RelMdDistribution.java:98)
> [0;1mat
> org.apache.calcite.rel.metadata.RelMdDistributionTest.test(RelMdDistributionTest.java:76)
> {code}
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