hudi-agent commented on code in PR #19165:
URL: https://github.com/apache/hudi/pull/19165#discussion_r3523689250


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hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/hudi/functional/TestFileGroupReaderReadPath.scala:
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@@ -0,0 +1,315 @@
+/*
+ * 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.hudi.functional
+
+import org.apache.hudi.{DataSourceReadOptions, DataSourceWriteOptions, 
HoodieFileIndex, ScalaAssertionSupport}
+import org.apache.hudi.HoodieConversionUtils.toJavaOption
+import org.apache.hudi.common.model.HoodieTableType
+import org.apache.hudi.common.table.HoodieTableConfig
+import org.apache.hudi.config.HoodieWriteConfig
+import org.apache.hudi.testutils.{DataSourceTestUtils, 
HoodieSparkClientTestBase}
+import org.apache.hudi.util.JFunction
+
+import org.apache.spark.sql.{SaveMode, SparkSession, SparkSessionExtensions}
+import org.apache.spark.sql.catalyst.expressions.{And, AttributeReference, 
EqualTo, Literal}
+import org.apache.spark.sql.execution.datasources.PartitionDirectory
+import org.apache.spark.sql.hudi.HoodieSparkSessionExtension
+import org.apache.spark.sql.types.{DataType, DoubleType, IntegerType, 
LongType, StringType}
+import org.junit.jupiter.api.{AfterEach, BeforeEach}
+import org.junit.jupiter.api.Assertions.{assertEquals, assertFalse, assertTrue}
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.EnumSource
+
+import java.util.function.Consumer
+
+/**
+ * Functional coverage for the default (file-group reader) Spark read path.
+ *
+ * These tests keep 
[[org.apache.hudi.common.config.HoodieReaderConfig.FILE_GROUP_READER_ENABLED]]
+ * at its default (enabled) and drive read-time schema evolution, MOR base+log 
merge, partition
+ * pruning and typed partition-value projection through public DataFrame 
reads. They intentionally
+ * target branches left uncovered by the legacy-reader suite (PR #19133) and 
the existing
+ * COW/MOR/CDC functional suites: schema-on-read filter rebuilding, add-column 
/ type-promotion
+ * evolution branches, HoodieFileIndex/SparkHoodieTableFileIndex partition 
pruning decisions, and
+ * the per-version HoodiePartitionValues getters used when partition columns 
are reconstructed.
+ */
+class TestFileGroupReaderReadPath extends HoodieSparkClientTestBase with 
ScalaAssertionSupport {
+
+  var spark: SparkSession = _
+
+  private val baseOpts = Map(
+    "hoodie.insert.shuffle.parallelism" -> "2",
+    "hoodie.upsert.shuffle.parallelism" -> "2",
+    "hoodie.bulkinsert.shuffle.parallelism" -> "2",
+    "hoodie.delete.shuffle.parallelism" -> "1",
+    DataSourceWriteOptions.RECORDKEY_FIELD.key -> "id",
+    HoodieTableConfig.ORDERING_FIELDS.key -> "ts",
+    HoodieWriteConfig.TBL_NAME.key -> "hoodie_fg_reader_test",
+    // keep log files around on MOR so snapshot reads exercise base+log merge
+    "hoodie.compact.inline" -> "false"
+  )
+
+  override def getSparkSessionExtensionsInjector: 
org.apache.hudi.common.util.Option[Consumer[SparkSessionExtensions]] =
+    toJavaOption(
+      Some(
+        JFunction.toJavaConsumer((receiver: SparkSessionExtensions) =>
+          new HoodieSparkSessionExtension().apply(receiver))))
+
+  @BeforeEach
+  override def setUp(): Unit = {
+    initPath()
+    initSparkContexts()
+    spark = sqlContext.sparkSession
+    initTestDataGenerator()
+    initHoodieStorage()
+  }
+
+  @AfterEach
+  override def tearDown(): Unit = {
+    cleanupSparkContexts()
+    cleanupTestDataGenerator()
+    cleanupFileSystem()
+  }
+
+  /**
+   * Add-column schema evolution read: a column is introduced by a later 
commit while
+   * schema-on-read is enabled. The snapshot read must expose the new column 
(null for the
+   * older, un-touched rows), and pushed-down filters over both the 
pre-existing and the newly
+   * added columns must produce correct results. On MOR the update batch lands 
in log files, so
+   * the snapshot read additionally exercises the base+log merge iteration.
+   */
+  @ParameterizedTest
+  @EnumSource(classOf[HoodieTableType])
+  def testAddColumnEvolutionSnapshotAndIncrementalRead(tableType: 
HoodieTableType): Unit = {
+    val _spark = spark
+    import _spark.implicits._
+
+    val writeOpts = baseOpts ++ Map(
+      DataSourceWriteOptions.TABLE_TYPE.key -> tableType.name,
+      DataSourceWriteOptions.PARTITIONPATH_FIELD.key -> "part",
+      "hoodie.schema.on.read.enable" -> "true"

Review Comment:
   🤖 nit: `"hoodie.schema.on.read.enable"` appears five times across this file. 
Could you extract it as a `private val` at the class level (or use the constant 
from `HoodieReaderConfig` if one exists)? That way a key rename only needs one 
touch.
   
   <sub><i>⚠️ AI-generated; verify before applying. React 👍/👎 to flag 
quality.</i></sub>



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