[jira] [Work started] (HIVE-21837) MapJoin is throwing exception when selected column is having completely null values

["Naresh P R (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-21837 started by Naresh P R.
-----------------------------------------
> MapJoin is throwing exception when selected column is having completely null values
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-21837
>                 URL: https://issues.apache.org/jira/browse/HIVE-21837
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Naresh P R
>            Assignee: Naresh P R
>            Priority: Major
>
> With huge data, below query
> {code:java}
> SELECT
>  a.id,
>  null
>  FROM table a 
>  JOIN table b ON (a.id = b.id)
>  JOIN (SELECT '1234' id, 'deptno' type UNION ALL SELECT '5678' id, 'deptno' type) c ON (c.type = a.type){code}
> is throwing below exception.
> {code:java}
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Column vector class org.apache.hadoop.hive.ql.exec.vector.VoidColumnVector is not supported!
>  at org.apache.hadoop.hive.ql.exec.vector.VectorizedBatchUtil.makeLikeColumnVector(VectorizedBatchUtil.java:624)
>  at org.apache.hadoop.hive.ql.exec.vector.VectorizedBatchUtil.makeLike(VectorizedBatchUtil.java:861)
>  at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinCommonOperator.commonSetup(VectorMapJoinCommonOperator.java:583)
>  at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinGenerateResultOperator.commonSetup(VectorMapJoinGenerateResultOperator.java:128)
>  at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinInnerGenerateResultOperator.commonSetup(VectorMapJoinInnerGenerateResultOperator.java:112)
>  at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinInnerMultiKeyOperator.process(VectorMapJoinInnerMultiKeyOperator.java:119)
>  ... 21 more{code}



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