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From "Nick Dimiduk (JIRA)" <>
Subject [jira] [Commented] (SPARK-19638) Filter pushdown not working for struct fields
Date Fri, 17 Feb 2017 16:27:41 GMT


Nick Dimiduk commented on SPARK-19638:

[~maropu] I have placed a breakpoint in the ES connector's implementation of {{PrunedFilterScan#buildScan(Array[String],
Array[Filter])}}. Here I see no filters for the struct columns. Indeed this is precisely where
the log messages are produced. For this reason, I believe this to be an issue with Catalyst,
not the connector. Perhaps you can guide me through further debugging? Thanks.

> Filter pushdown not working for struct fields
> ---------------------------------------------
>                 Key: SPARK-19638
>                 URL:
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Nick Dimiduk
> Working with a dataset containing struct fields, and enabling debug logging in the ES
connector, I'm seeing the following behavior. The dataframe is created over the ES connector
and then the schema is extended with a couple column aliases, such as.
> {noformat}
> df.withColumn("f2", df("foo"))
> {noformat}
> Queries vs those alias columns work as expected for fields that are non-struct members.
> {noformat}
> scala> df.withColumn("f2", df("foo")).where("f2 == '1'").limit(0).show
> 17/02/16 15:06:49 DEBUG DataSource: Pushing down filters [IsNotNull(foo),EqualTo(foo,1)]
> 17/02/16 15:06:49 TRACE DataSource: Transformed filters into DSL [{"exists":{"field":"foo"}},{"match":{"foo":"1"}}]
> {noformat}
> However, try the same with an alias over a struct field, and no filters are pushed down.
> {noformat}
> scala> df.withColumn("bar_baz", df("bar.baz")).where("bar_baz == '1'").limit(1).show
> {noformat}
> In fact, this is the case even when no alias is used at all.
> {noformat}
> scala> df.where("bar.baz == '1'").limit(1).show
> {noformat}
> Basically, pushdown for structs doesn't work at all.
> Maybe this is specific to the ES connector?

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