[jira] [Created] (SPARK-12639) Improve Explain for DataSources with Handled Predicate Pushdowns

["Russell Alexander Spitzer (JIRA)" <ji...@apache.org>]

Russell Alexander Spitzer created SPARK-12639:
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             Summary: Improve Explain for DataSources with Handled Predicate Pushdowns
                 Key: SPARK-12639
                 URL: https://issues.apache.org/jira/browse/SPARK-12639
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 1.6.0
            Reporter: Russell Alexander Spitzer
            Priority: Minor


SPARK-11661 improves handling of predicate pushdowns but has an unintended consequence of making the explain string more confusing.

It basically makes it seem as if a source is always pushing down all of the filters (even those it cannot handle)
This can have a confusing effect (I kept checking my code to see where I had broken something  )
"Query plan for source where nothing is handled by C* Source"
Filter ((((a#71 = 1) && (b#72 = 2)) && (c#73 = 1)) && (e#75 = 1))
+- Scan org.apache.spark.sql.cassandra.CassandraSourceRelation@4b9cf75c[a#71,b#72,c#73,d#74,e#75,f#76,g#77,h#78] PushedFilters: [EqualTo(a,1), EqualTo(b,2), EqualTo(c,1), EqualTo(e,1)]
Although the tell tale "Filter" step is present my first instinct would tell me that the underlying source relation is using all of those filters.
"Query plan for source where everything is handled by C* Source"
Scan org.apache.spark.sql.cassandra.CassandraSourceRelation@55d4456c[a#79,b#80,c#81,d#82,e#83,f#84,g#85,h#86] PushedFilters: [EqualTo(a,1), EqualTo(b,2), EqualTo(c,1), EqualTo(e,1)]
I think this would be much clearer if we changed the metadata key to "HandledFilters" and only listed those handled fully by the underlying source.



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