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https://issues.apache.org/jira/browse/HIVE-20991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zoltan Haindrich reassigned HIVE-20991:
---------------------------------------
> Presence of an empty aggregation should not lead to Exceptions
> --------------------------------------------------------------
>
> Key: HIVE-20991
> URL: https://issues.apache.org/jira/browse/HIVE-20991
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> After some transformations if an "empty" aggregation is present;
> {{LoptOptimizeJoinRule}} may bump into an array index violation.
> Original query is complicated; but this small {{RelMetadataTest}} testcase
> reproduces the root cause.
> {code}
> @Test public void testEmptyAggregateNotCausesException() throws Exception {
> final FrameworkConfig config = RelBuilderTest.config().build();
> final RelBuilder builder = RelBuilder.create(config);
> RelMetadataQuery mq = RelMetadataQuery.instance();
> RelNode agg = builder
> .scan("EMP")
> .aggregate(builder.groupKey(), Collections.<AggCall>
> emptyList()).build();
> mq.getTableOrigin(agg);
> }
> {code}
> Exception is:
> {code}
> java.lang.IndexOutOfBoundsException: index (0) must be less than size (0)
> at
> com.google.common.base.Preconditions.checkElementIndex(Preconditions.java:310)
> at
> com.google.common.base.Preconditions.checkElementIndex(Preconditions.java:293)
> at
> com.google.common.collect.RegularImmutableList.get(RegularImmutableList.java:67)
> at
> org.apache.calcite.rel.metadata.RelMdColumnOrigins.getColumnOrigins(RelMdColumnOrigins.java:77)
> at GeneratedMetadataHandler_ColumnOrigin.getColumnOrigins_$(Unknown
> Source)
> at GeneratedMetadataHandler_ColumnOrigin.getColumnOrigins(Unknown
> Source)
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.getColumnOrigins(RelMetadataQuery.java:345)
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.getTableOrigin(RelMetadataQuery.java:418)
> at
> org.apache.calcite.test.RelMetadataTest.testEmptyAggregateNotCausesException(RelMetadataTest.java:2396)
> {code}
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