[GitHub] [spark] attilapiros commented on a change in pull request #24271: [SPAR-27342][SQL] Optimize Limit 0 queries

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attilapiros commented on a change in pull request #24271: [SPAR-27342][SQL] Optimize Limit 0 queries
URL: https://github.com/apache/spark/pull/24271#discussion_r271919706
 
 

 ##########
 File path: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/OptimizeLimitZeroSuite.scala
 ##########
 @@ -0,0 +1,112 @@
+/*
+ * 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.Row
+import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.catalyst.dsl.plans._
+import org.apache.spark.sql.catalyst.expressions.Literal
+import org.apache.spark.sql.catalyst.plans._
+import org.apache.spark.sql.catalyst.plans.logical.{Distinct, GlobalLimit, LocalLimit, LocalRelation, LogicalPlan, Project}
+import org.apache.spark.sql.catalyst.rules.RuleExecutor
+import org.apache.spark.sql.types.IntegerType
+
+// Test class to verify correct functioning of OptimizeLimitZero rule in various scenarios
+class OptimizeLimitZeroSuite extends PlanTest {
+  object Optimize extends RuleExecutor[LogicalPlan] {
+    val batches =
+      Batch("OptimizeLimitZero", Once,
+        ReplaceIntersectWithSemiJoin,
+        OptimizeLimitZero,
+        PropagateEmptyRelation) :: Nil
+  }
+
+  val testRelation1 = LocalRelation.fromExternalRows(Seq('a.int), data = Seq(Row(1)))
+  val testRelation2 = LocalRelation.fromExternalRows(Seq('b.int), data = Seq(Row(1)))
+
+
 
 Review comment:
   super Nit: too much empty lines

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