Github user eyalfa commented on a diff in the pull request:
https://github.com/apache/spark/pull/16043#discussion_r98660310
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/ComplexTypes.scala
---
@@ -0,0 +1,166 @@
+/*
+ * 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) =>
+ // instead f selecting the field on the entire array,
+ // select it from each member of the array.
+ // pushing down the operation this way open other optimizations
opportunities
+ // (i.e. struct(...,x,...).x)
+ CreateArray(elems.map(GetStructField(_, ordinal,
Some(field.name))))
+ // push down item selection.
+ case ga @ GetArrayItem(CreateArray(elems), IntegerLiteral(idx)) =>
+ // instead of creating the array and then selecting one row,
+ // remove array creation altgether.
+ if (idx >= 0 && idx < elems.size) {
+ // valid index
+ elems(idx)
+ } else {
+ // out of bounds, mimic the runtime behavior and return null
+ Cast(Literal(null), ga.dataType)
--- End diff --
yep
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
