AnishMahto commented on code in PR #55836:
URL: https://github.com/apache/spark/pull/55836#discussion_r3244449788


##########
sql/pipelines/src/test/scala/org/apache/spark/sql/pipelines/autocdc/ChangeArgsSuite.scala:
##########
@@ -0,0 +1,155 @@
+/*
+ * 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.pipelines.autocdc
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.parser.ParseException
+import org.apache.spark.sql.types.{IntegerType, StringType, StructType}
+
+class ChangeArgsSuite extends SparkFunSuite {
+
+  private val sourceSchema = new StructType()
+    .add("id", IntegerType, nullable = false)
+    .add("Name", StringType)
+    .add("age", IntegerType)
+
+  test("ColumnSelection None leaves schema unchanged") {
+    assert(ColumnSelection.applyToSchema(sourceSchema, None) == sourceSchema)
+  }
+
+  test("ColumnSelection IncludeColumns filters by exact name in schema order") 
{
+    val filteredSchema = ColumnSelection.applyToSchema(
+      sourceSchema,
+      Some(ColumnSelection.IncludeColumns(
+        Seq(UnqualifiedColumnName("age"), UnqualifiedColumnName("Name")))))
+
+    assert(filteredSchema == new StructType()
+      .add("Name", StringType)
+      .add("age", IntegerType))
+  }
+
+  test("ColumnSelection ExcludeColumns filters by exact name") {
+    val filteredSchema = ColumnSelection.applyToSchema(
+      sourceSchema,
+      Some(ColumnSelection.ExcludeColumns(Seq(UnqualifiedColumnName("id")))))
+
+    assert(filteredSchema == new StructType()
+      .add("Name", StringType)
+      .add("age", IntegerType))
+  }
+
+  test("ColumnSelection IncludeColumns fails for columns not present in 
schema") {
+    checkError(
+      exception = intercept[AnalysisException] {
+        ColumnSelection.applyToSchema(
+          sourceSchema,
+          // Column inclusion is case-sensitive; "name" will not match against 
"Name".
+          Some(ColumnSelection.IncludeColumns(
+            Seq(UnqualifiedColumnName("name"), 
UnqualifiedColumnName("missing"))))
+        )
+      },
+      condition = "AUTOCDC_INVALID_COLUMN_SELECTION.COLUMNS_NOT_FOUND",
+      sqlState = "42703",
+      parameters = Map(
+        "missingColumns" -> "name, missing",
+        "availableColumns" -> "id, Name, age"
+      )
+    )
+  }
+
+  test("ColumnSelection ExcludeColumns fails for columns not present in 
schema") {
+    checkError(
+      exception = intercept[AnalysisException] {
+        ColumnSelection.applyToSchema(
+          sourceSchema,
+          // Column exclusion is case-sensitive; "NAME" will not match against 
"Name".
+          Some(ColumnSelection.ExcludeColumns(
+            Seq(UnqualifiedColumnName("NAME"), 
UnqualifiedColumnName("missing"))))
+        )
+      },
+      condition = "AUTOCDC_INVALID_COLUMN_SELECTION.COLUMNS_NOT_FOUND",
+      sqlState = "42703",
+      parameters = Map(
+        "missingColumns" -> "NAME, missing",
+        "availableColumns" -> "id, Name, age"
+      )
+    )
+  }
+
+  test("UnqualifiedColumnName accepts a simple single-part identifier") {
+    assert(UnqualifiedColumnName("col").name == "col")
+  }
+
+  test("UnqualifiedColumnName accepts a backtick-quoted name containing a 
literal dot") {
+    // Backticks make the dot part of a single name part, so this passes 
validation.
+    assert(UnqualifiedColumnName("`a.b`").name == "`a.b`")

Review Comment:
   Done, added `IncludeColumns correctly matches a backtick-quoted literal-dot 
column`.



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