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Posted to issues@spark.apache.org by "Andrey Balmin (JIRA)" <ji...@apache.org> on 2016/04/28 22:04:12 UTC
[jira] [Created] (SPARK-14986) Spark SQL returns incorrect results
for LATERAL VIEW OUTER queries if all inner columns are projected out
Andrey Balmin created SPARK-14986:
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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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