Krisztian Kasa created CALCITE-4166:
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Summary: 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: 1.24.0, 1.21.0
Reporter: Krisztian Kasa
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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