Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10837#discussion_r50215371
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/EliminateSubQueriesSuite.scala
---
@@ -0,0 +1,67 @@
+/*
+ * 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.analysis.EliminateSubQueries
+import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.catalyst.dsl.plans._
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.expressions.Literal.TrueLiteral
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.catalyst.plans.logical._
+import org.apache.spark.sql.catalyst.rules._
+
+
+class EliminateSubQueriesSuite extends PlanTest with PredicateHelper {
+
+ object Optimize extends RuleExecutor[LogicalPlan] {
+ val batches = Batch("EliminateSubQueries", Once, EliminateSubQueries)
:: Nil
+ }
+
+ protected def assertEquivalent(e1: Expression, e2: Expression): Unit = {
+ val correctAnswer = Project(Alias(e2, "out")() :: Nil,
OneRowRelation).analyze
+ val actual = Optimize.execute(Project(Alias(e1, "out")() :: Nil,
OneRowRelation).analyze)
+ comparePlans(actual, correctAnswer)
+ }
+
+ test("eliminate top level subquery") {
+ val input = LocalRelation('a.int, 'b.int)
+ val query = Subquery("a", input)
+ val optimized = Optimize.execute(query.analyze)
+ comparePlans(optimized, input)
+ }
+
+ test("eliminate mid-tree subquery") {
+ val input = LocalRelation('a.int, 'b.int)
+ val query = Filter(TrueLiteral, Subquery("a", input))
+ val optimized = Optimize.execute(query.analyze)
+ comparePlans(
+ optimized,
+ Filter(TrueLiteral, LocalRelation('a.int, 'b.int)))
+ }
+
+ test("eliminate multiple subqueries") {
--- End diff --
how about we add one more test that eliminate multiple subqueries from
multiple children, like join?
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