Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20795#discussion_r201757597
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/LookupFunctionsSuite.scala
---
@@ -0,0 +1,70 @@
+/*
+ * 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.analysis
+
+import java.net.URI
+
+import org.apache.spark.sql.catalyst.{FunctionIdentifier, TableIdentifier}
+import org.apache.spark.sql.catalyst.catalog.{CatalogDatabase,
InMemoryCatalog, SessionCatalog}
+import org.apache.spark.sql.catalyst.expressions.Alias
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.catalyst.plans.logical._
+import org.apache.spark.sql.internal.SQLConf
+
+class LookupFunctionsSuite extends PlanTest {
+
+ test("SPARK-23486: LookupFunctions should not check the same function
name more than once") {
+ val externalCatalog = new CustomInMemoryCatalog
+ val conf = new SQLConf()
+ val catalog = new SessionCatalog(externalCatalog,
FunctionRegistry.builtin, conf)
+ val analyzer = {
+ catalog.createDatabase(
+ CatalogDatabase("default", "", new URI("loc"), Map.empty),
+ ignoreIfExists = false)
+ new Analyzer(catalog, conf)
+ }
+
+ def table(ref: String): LogicalPlan =
UnresolvedRelation(TableIdentifier(ref))
+ val unresolvedFunc = UnresolvedFunction("func", Seq.empty, false)
+ val plan = Project(
+ Seq(Alias(unresolvedFunc, "call1")(), Alias(unresolvedFunc,
"call2")(),
+ Alias(unresolvedFunc, "call1")()),
+ table("TaBlE"))
+ analyzer.LookupFunctions.apply(plan)
+ assert(externalCatalog.getFunctionExistsCalledTimes == 1)
+
+ assert(analyzer.LookupFunctions.normalizeFuncName
+ (unresolvedFunc.name).database == Some("default"))
+ assert(catalog.isRegisteredFunction(unresolvedFunc.name) == false)
+ assert(catalog.isRegisteredFunction(FunctionIdentifier("max")) == true)
--- End diff --
We do not need to add assert.
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