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https://issues.apache.org/jira/browse/SPARK-19638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15871162#comment-15871162
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Takeshi Yamamuro commented on SPARK-19638:
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The pushing-down stuffs depend on datasources, so this is specific to the ES
connector.
There is no log entry "Pushing down filters..." in spark, so you'd better to
ask the author community of the connector.
> Filter pushdown not working for struct fields
> ---------------------------------------------
>
> Key: SPARK-19638
> URL: https://issues.apache.org/jira/browse/SPARK-19638
> 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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