viirya commented on a change in pull request #24599: [SPARK-27701][SQL] Extend
NestedColumnAliasing to general nested field cases including GetArrayStructField
URL: https://github.com/apache/spark/pull/24599#discussion_r292329802
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -86,32 +86,39 @@ object NestedColumnAliasing {
}
/**
- * Return root references that are individually accessed as a whole, and
`GetStructField`s.
+ * Return root references that are individually accessed as a whole, and
`GetStructField`s
+ * or `GetArrayStructField`s which on top of other `ExtractValue`s or
special expressions.
+ * Check `SelectedField` to see which expressions should be listed here.
*/
- private def collectRootReferenceAndGetStructField(e: Expression):
Seq[Expression] = e match {
- case _: AttributeReference | _: GetStructField => Seq(e)
- case es if es.children.nonEmpty =>
es.children.flatMap(collectRootReferenceAndGetStructField)
+ private def collectRootReferenceAndExtractValue(e: Expression):
Seq[Expression] = e match {
+ case _: AttributeReference |
+ GetStructField(_: ExtractValue | _: AttributeReference, _, _) |
+ GetArrayStructFields(_: MapValues |
+ _: MapKeys |
+ _: ExtractValue |
+ _: AttributeReference, _, _, _, _) => Seq(e)
Review comment:
Ur? I already split it to `AttributeReference`, `GetStructField` and
`GetArrayStructFields` cases.
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