zhipengmao-db commented on code in PR #48423:
URL: https://github.com/apache/spark/pull/48423#discussion_r1803237540


##########
sql/core/src/test/scala/org/apache/spark/sql/collation/CollationTypePrecedenceSuite.scala:
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@@ -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.collation
+
+import org.apache.spark.SparkThrowable
+import org.apache.spark.sql.{DataFrame, Row}
+import org.apache.spark.sql.connector.DatasourceV2SQLBase
+import org.apache.spark.sql.execution.adaptive.AdaptiveSparkPlanHelper
+
+class CollationTypePrecedenceSuite extends DatasourceV2SQLBase with 
AdaptiveSparkPlanHelper {
+
+  val dataSource: String = "parquet"
+
+  private def assertThrowsError(df: => DataFrame, errorClass: String): Unit = {
+    val exception = intercept[SparkThrowable] {
+      df
+    }
+    assert(exception.getCondition === errorClass)
+  }
+
+  test("access collated map via literal") {
+    val tableName = "map_with_lit"
+
+    def selectQuery(condition: String): DataFrame =
+      sql(s"SELECT c1 FROM $tableName WHERE $condition = 'B'")
+
+    withTable(tableName) {
+      sql(s"""
+           |CREATE TABLE $tableName (
+           |  c1 MAP<STRING COLLATE UNICODE_CI, STRING COLLATE UNICODE_CI>,
+           |  c2 STRING
+           |) USING $dataSource

Review Comment:
   Does it make a difference whether we are using delta or parquet?



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