maropu commented on a change in pull request #26978: [SPARK-29721][SQL] Prune
unnecessary nested fields from Generate without Project
URL: https://github.com/apache/spark/pull/26978#discussion_r367705656
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -155,6 +155,49 @@ object NestedColumnAliasing {
case MapType(keyType, valueType, _) => totalFieldNum(keyType) +
totalFieldNum(valueType)
case _ => 1 // UDT and others
}
+}
+
+/**
+ * This prunes unnessary nested columns from `Generate` and optional `Project`
on top
+ * of it.
+ */
+object GeneratorNestedColumnAliasing {
+ def unapply(plan: LogicalPlan): Option[LogicalPlan] = plan match {
+ case Project(projectList, g: Generate) if
(SQLConf.get.nestedPruningOnExpressions ||
+ SQLConf.get.nestedSchemaPruningEnabled) &&
canPruneGenerator(g.generator) =>
Review comment:
(oh, this part looks complicated..) If we keep the current condition
(nestedSchemaPruningEnabled + nestedPruningOnExpressions), IMO better to leave
the comment above in the code side.
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