[jira] [Created] (SPARK-12560) SqlTestUtils.stripSparkFilter needs to copy utf8strings

["Imran Rashid (JIRA)" <ji...@apache.org>]

Imran Rashid created SPARK-12560:
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             Summary: SqlTestUtils.stripSparkFilter needs to copy utf8strings
                 Key: SPARK-12560
                 URL: https://issues.apache.org/jira/browse/SPARK-12560
             Project: Spark
          Issue Type: Test
          Components: SQL
            Reporter: Imran Rashid
            Priority: Minor


{{SqlTestUtils.stripSparkFilter}} needs to make copies of the UTF8Strings, eg., with {{FromUnsafeProjection}} to avoid returning duplicates of the same row (see SPARK-9459).

Right now, this isn't causing any problems, since the parquet string predicate pushdown is turned off (see SPARK-11153).  However I ran into this while trying to get the predicate pushdown to work with a different version of parquet.  Without this fix, there were errors like:

{noformat}
[info]   !== Correct Answer - 4 ==   == Spark Answer - 4 ==
[info]   ![1]                        [2]
[info]    [2]                        [2]
[info]   ![3]                        [4]
[info]    [4]                        [4] (QueryTest.scala:127)
{noformat}

I figure its worth making this change now while I ran into it.  PR coming shortly



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