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From "Andrey Balmin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-14986) Spark SQL returns incorrect results for LATERAL VIEW OUTER queries if all inner columns are projected out
Date Thu, 28 Apr 2016 20:04:12 GMT
Andrey Balmin created SPARK-14986:
-------------------------------------

             Summary: Spark SQL returns incorrect results for LATERAL VIEW OUTER queries if
all inner columns are projected out
                 Key: SPARK-14986
                 URL: https://issues.apache.org/jira/browse/SPARK-14986
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.5.2
            Reporter: Andrey Balmin


Repro:   using Hive context, run this SQL query:
   select  nil from (select 1 as x ) x LATERAL VIEW OUTER EXPLODE( array ()) n as nil

Actual result:             returns 0 rows.
Expected results:      should return 1 row with null value.

Details:
If the query is modified to also return x:
   select x, nil from (select 1 as x ) x LATERAL VIEW OUTER EXPLODE( array ()) n as nil

it works correctly and returns 1 row: [ 1, null ]
Clearly, changing Select clause of a query should not change the number of rows it returns.
Looking at the query plan it seems that the Generator object was (incorrectly) marked with
“join=false"



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