maropu commented on a change in pull request #24158: [SPARK-26847][SQL] Pruning
nested serializers from object serializers: MapType support
URL: https://github.com/apache/spark/pull/24158#discussion_r268031052
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/objects.scala
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@@ -132,49 +130,74 @@ object ObjectSerializerPruning extends Rule[LogicalPlan]
{
fields.map(f => collectStructType(f.dataType, structs))
case ArrayType(elementType, _) =>
collectStructType(elementType, structs)
+ case MapType(_, valueType, _) =>
+ // Because we can't select a field from struct in key, so we skip key
type.
+ collectStructType(valueType, structs)
case _ =>
}
structs
}
+ /**
+ * This method returns pruned `CreateNamedStruct` expression given an
original `CreateNamedStruct`
+ * and a pruned `StructType`.
+ */
+ private def pruneNamedStruct(struct: CreateNamedStruct, prunedType:
StructType) = {
+ // Filters out the pruned fields.
+ val prunedFields = struct.nameExprs.zip(struct.valExprs).filter { case
(nameExpr, _) =>
+ val name = nameExpr.eval(EmptyRow).toString
Review comment:
Any reason to explicitly set `EmptyRow` here? Some callsites does so, but
the other sites does not.
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