Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16043#discussion_r98183279
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/ComplexTypes.scala
---
@@ -0,0 +1,128 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.optimizer
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+import org.apache.spark.sql.catalyst.rules.Rule
+
+/**
+* push down operations into [[CreateNamedStructLike]].
+*/
+object SimplifyCreateStructOps extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = {
+ plan.transformExpressionsUp {
+ // push down field extraction
+ case GetStructField(createNamedStructLike: CreateNamedStructLike,
ordinal, _) =>
+ createNamedStructLike.valExprs(ordinal)
+ }
+ }
+}
+
+/**
+* push down operations into [[CreateArray]].
+*/
+object SimplifyCreateArrayOps extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = {
+ plan.transformExpressionsUp {
+ // push down field selection (array of structs)
+ case GetArrayStructFields(CreateArray(elems), field, ordinal,
numFields, containsNull) =>
+ CreateArray(elems.map(GetStructField(_, ordinal,
Some(field.name))))
+ // push down item selection.
+ case ga @ GetArrayItem(CreateArray(elems), IntegerLiteral(idx)) =>
+ if (idx >= 0 && idx < elems.size) {
+ elems(idx)
+ } else {
+ Cast(Literal(null), ga.dataType)
+ }
+ }
+ }
+}
+
+/**
+* push down operations into [[CreateMap]].
--- End diff --
This needs a lot more documentation. Your approach is far from trivial, and
an unsuspecting reader needs some help here.
Also align comment.
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