hvanhovell commented on a change in pull request #22573: [SPARK-25558][SQL]
Pushdown predicates for nested fields in DataSource Strategy
URL: https://github.com/apache/spark/pull/22573#discussion_r275846248
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
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@@ -442,53 +442,65 @@ object DataSourceStrategy {
* @return a `Some[Filter]` if the input [[Expression]] is convertible,
otherwise a `None`.
*/
protected[sql] def translateFilter(predicate: Expression): Option[Filter] = {
+ // Recursively try to find an attribute name from the top level that can
be pushed down.
+ def attrName(e: Expression): Option[String] = e match {
+ // In Spark and many data sources such as parquet, dots are used as a
column path delimiter;
+ // thus, we don't translate such expressions.
+ case a: Attribute if !a.name.contains(".") =>
+ Some(a.name)
+ case s: GetStructField if !s.childSchema(s.ordinal).name.contains(".") =>
+ attrName(s.child).map(_ + s".${s.childSchema(s.ordinal).name}")
Review comment:
`_ + "." + s.childSchema(s.ordinal).name`?
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