Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8268#discussion_r37474409
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ColumnPruningSuite.scala
---
@@ -0,0 +1,84 @@
+/*
+ * 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.Explode
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.catalyst.plans.logical.{Project,
LocalRelation, Generate, LogicalPlan}
+import org.apache.spark.sql.catalyst.rules.RuleExecutor
+import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.catalyst.dsl.plans._
+import org.apache.spark.sql.types.StringType
+
+class ColumnPruningSuite extends PlanTest {
+
+ object Optimize extends RuleExecutor[LogicalPlan] {
+ val batches = Batch("Column pruning", FixedPoint(100),
+ ColumnPruning) :: Nil
+ }
+
+ test("Column pruning for Generate when Generate.join = false") {
+ val input = LocalRelation('a.int, 'b.array(StringType))
+
+ val query = Generate(Explode('b), false, false, None, 's.string ::
Nil, input).analyze
+ val optimized = Optimize.execute(query)
+
+ val correctAnswer =
+ Generate(Explode('b), false, false, None, 's.string :: Nil,
+ Project('b.attr :: Nil, input)).analyze
+
+ comparePlans(optimized, correctAnswer)
+ }
+
+ test("Column pruning for Generate when Generate.join = true") {
+ val input = LocalRelation('a.int, 'b.int, 'c.array(StringType))
+
+ val query =
+ Project(Seq('a, 's),
+ Generate(Explode('c), true, false, None, 's.string :: Nil,
+ input)).analyze
+ val optimized = Optimize.execute(query)
+
+ val correctAnswer =
+ Project(Seq('a, 's),
+ Generate(Explode('c), true, false, None, 's.string :: Nil,
+ Project(Seq('a, 'c),
+ input))).analyze
+
+ comparePlans(optimized, correctAnswer)
+ }
+
+ test("Turn Generate.join to false if possible") {
+ val input = LocalRelation('b.array(StringType))
+
+ val query =
+ Project(('s + 1).as("s+1") :: Nil,
+ Generate(Explode('b), true, false, None, 's.string :: Nil,
+ input)).analyze
+ val optimized = Optimize.execute(query)
+
+ val correctAnswer =
+ Project(('s + 1).as("s+1") :: Nil,
+ Generate(Explode('b), false, false, None, 's.string :: Nil,
+ input)).analyze
+
+ comparePlans(optimized, correctAnswer)
--- End diff --
Maybe we can also have a test for `val input = LocalRelation('a.int,
'b.array(StringType))`. Basically, we test turning `join` to false and then we
add a project as the child of `Generate`.
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