Github user asfgit commented on the issue:
https://github.com/apache/carbondata/pull/988
Refer to this link for build results (access rights to CI server needed):
https://builds.apache.org/job/carbondata-pr-spark-2.1/42/<h2>Failed Tests:
<span class='status-failure'>1</span></h2><h3><a
name='carbondata-pr-spark-2.1/org.apache.carbondata:carbondata-spark-common-test'
/><a
href='https://builds.apache.org/job/carbondata-pr-spark-2.1/42/org.apache.carbondata$carbondata-spark-common-test/testReport'>carbondata-pr-spark-2.1/org.apache.carbondata:carbondata-spark-common-test</a>:
<span class='status-failure'>1</span></h3><ul><li><a
href='https://builds.apache.org/job/carbondata-pr-spark-2.1/42/org.apache.carbondata$carbondata-spark-common-test/testReport/org.apache.carbondata.spark.testsuite.allqueries/InsertIntoCarbonTableTestCase/insert_into_carbon_table_from_carbon_table_union_query/'><strong>org.apache.carbondata.spark.testsuite.allqueries.InsertIntoCarbonTableTestCase.insert
into carbon table from carbon table union query</strong></a></li></ul>
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