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https://issues.apache.org/jira/browse/SPARK-21034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abhijit Bhole updated SPARK-21034:
----------------------------------
    Summary: Allow filter pushdown filters through non deterministic functions 
for columns involved in groupby / join  (was: Filter not getting pushed down 
the groupBy clause when first() or last() aggregate function is used)

> Allow filter pushdown filters through non deterministic functions for columns 
> involved in groupby / join
> --------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-21034
>                 URL: https://issues.apache.org/jira/browse/SPARK-21034
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer, SQL
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Abhijit Bhole
>
> Here is a sample code - 
> {code:java}
> from pyspark.sql import functions as F
> df = spark.createDataFrame([{ "a": 1, "b" : 2, "c":7}, { "a": 3, "b" : 4, "c" 
> : 8},
>                            { "a": 1, "b" : 5, "c":7}, { "a": 1, "b" : 6, 
> "c":7} ])
> df.groupBy(["a"]).agg(F.sum("b")).where("a = 1").explain()
> df.groupBy(["a"]).agg(F.sum("b"), F.first("c")).where("a = 1").explain()
> == Physical Plan ==
> *HashAggregate(keys=[a#15L], functions=[sum(b#16L)])
> +- Exchange hashpartitioning(a#15L, 4)
>    +- *HashAggregate(keys=[a#15L], functions=[partial_sum(b#16L)])
>       +- *Project [a#15L, b#16L]
>          +- *Filter (isnotnull(a#15L) && (a#15L = 1))
>             +- Scan ExistingRDD[a#15L,b#16L,c#17L]
> >>>
> >>> df.groupBy(["a"]).agg(F.sum("b"), F.first("c")).where("a = 1").explain()
> == Physical Plan ==
> *Filter (isnotnull(a#15L) && (a#15L = 1))
> +- *HashAggregate(keys=[a#15L], functions=[sum(b#16L), first(c#17L, false)])
>    +- Exchange hashpartitioning(a#15L, 4)
>       +- *HashAggregate(keys=[a#15L], functions=[partial_sum(b#16L), 
> partial_first(c#17L, false)])
>          +- Scan ExistingRDD[a#15L,b#16L,c#17L]
> {code}
> As you can see, the filter is not pushed down when F.first aggregate function 
> is used.



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