Github user eyalfa commented on a diff in the pull request:
https://github.com/apache/spark/pull/16043#discussion_r89886382
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/ComplexTypeConstructors.scala
---
@@ -0,0 +1,79 @@
+/*
+ * 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.{Cast, CreateArray,
CreateMap, CreateNamedStructLike, Expression, GetArrayItem,
GetArrayStructFields, GetMapValue, GetStructField, IntegerLiteral, Literal}
+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, _ ) =>
+ val value = createNamedStructLike.valExprs(ordinal)
+ value
+ }
+ }
+}
+
+/**
+* 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) =>
+ def getStructField( elem : Expression ) = {
+ GetStructField( elem, ordinal, Some(field.name) )
+ }
+ CreateArray( elems.map(getStructField) )
+ // 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]].
+*/
+object SimplifyCreateMapOps extends Rule[LogicalPlan]{
+ override def apply(plan: LogicalPlan): LogicalPlan = {
+ plan.transformExpressionsUp{
+ // attempt to unfold 'constant' key extraction,
+ // this enables other optimizations to take place.
+ case gmv @ GetMapValue(cm @ CreateMap(elems), key @ Literal(v, t)) =>
--- End diff --
assume constant folding already did its thing, otherwise there's not much
we can do anyway
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