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Posted to dev@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2018/11/30 14:46:00 UTC
[jira] [Created] (HIVE-20991) Presence of an empty aggregation
should not lead to Exceptions
Zoltan Haindrich created HIVE-20991:
---------------------------------------
Summary: 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
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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