[jira] [Updated] (SPARK-18597) Do not push down filters for LEFT ANTI JOIN

["Herman van Hovell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-18597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Herman van Hovell updated SPARK-18597:
--------------------------------------
    Labels: correctness  (was: )

> Do not push down filters for LEFT ANTI JOIN
> -------------------------------------------
>
>                 Key: SPARK-18597
>                 URL: https://issues.apache.org/jira/browse/SPARK-18597
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Herman van Hovell
>            Priority: Minor
>              Labels: correctness
>
> The optimizer pushes down filters for left anti joins. This unfortunately has the opposite effect. For example:
> {noformat}
> sql("create or replace temporary view tbl_a as values (1, 5), (2, 1), (3, 6) as t(c1, c2)")
> sql("create or replace temporary view tbl_b as values 1 as t(c1)")
> sql("""
> select *
> from   tbl_a
>        left anti join tbl_b on ((tbl_a.c1 = tbl_a.c2) is null or tbl_a.c1 = tbl_a.c2)
> """)
> {noformat}
> Should return rows [2, 1] & [3, 6], but returns no rows.
> The upside is that this will only happen when you use a really weird anti-join (only referencing the table on the left hand side).



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