yihua commented on code in PR #19912:
URL: https://github.com/apache/hudi/pull/19912#discussion_r4200177321


##########
hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/hudi/functional/TestIncrementalFileIndexSizeInBytes.scala:
##########
@@ -0,0 +1,106 @@
+/*
+ * 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, 
HoodieIncrementalFileIndex}
+import org.apache.hudi.common.model.HoodieTableType
+import org.apache.hudi.common.table.HoodieTableConfig
+import 
org.apache.hudi.common.testutils.HoodieTestDataGenerator.recordsToStrings
+import org.apache.hudi.config.HoodieWriteConfig
+import org.apache.hudi.testutils.HoodieSparkClientTestBase
+
+import org.apache.spark.sql.{DataFrame, SaveMode, SparkSession}
+import org.apache.spark.sql.execution.datasources.{HadoopFsRelation, 
LogicalRelation}
+import org.junit.jupiter.api.{AfterEach, BeforeEach}
+import org.junit.jupiter.api.Assertions.{assertEquals, assertTrue}
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.EnumSource
+
+import scala.collection.JavaConverters._
+
+/**
+ * Verifies the size reported to the Spark planner by 
[[HoodieIncrementalFileIndex]], which must never be 0
+ * or Spark may pick a broadcast join against the incremental source.
+ */
+class TestIncrementalFileIndexSizeInBytes extends HoodieSparkClientTestBase {
+
+  var spark: SparkSession = null
+
+  val commonOpts = Map(
+    "hoodie.insert.shuffle.parallelism" -> "4",
+    "hoodie.upsert.shuffle.parallelism" -> "4",
+    DataSourceWriteOptions.RECORDKEY_FIELD.key -> "_row_key",
+    DataSourceWriteOptions.PARTITIONPATH_FIELD.key -> "partition",
+    HoodieTableConfig.ORDERING_FIELDS.key -> "timestamp",
+    HoodieWriteConfig.TBL_NAME.key -> "hoodie_test"
+  )
+
+  @BeforeEach
+  override def setUp(): Unit = {
+    setTableName("hoodie_test")
+    initPath()
+    initSparkContexts()
+    spark = sqlContext.sparkSession
+    initTestDataGenerator()
+    initHoodieStorage()
+  }
+
+  @AfterEach
+  override def tearDown(): Unit = {
+    cleanupSparkContexts()
+    cleanupTestDataGenerator()
+    cleanupFileSystem()
+  }
+
+  @ParameterizedTest
+  @EnumSource(value = classOf[HoodieTableType])
+  def testIncrementalFileIndexSizeInBytes(tableType: HoodieTableType): Unit = {
+    val records = recordsToStrings(dataGen.generateInserts("001", 
100)).asScala.toList
+    spark.read.json(spark.sparkContext.parallelize(records, 
2)).write.format("hudi")
+      .options(commonOpts)
+      .option(DataSourceWriteOptions.TABLE_TYPE.key, tableType.name())
+      .option(DataSourceWriteOptions.OPERATION.key, 
DataSourceWriteOptions.INSERT_OPERATION_OPT_VAL)
+      .mode(SaveMode.Append)
+      .save(basePath)
+
+    // Reports Long.MaxValue by default, matching the pre-1.0 
IncrementalRelation.
+    assertEquals(Long.MaxValue, incrementalFileIndexOf(Map.empty).sizeInBytes)
+
+    // Reports the size of the files affected by the commits in range when 
disabled.
+    val fileIndex = incrementalFileIndexOf(Map(
+      DataSourceReadOptions.INCREMENTAL_REPORT_MAX_FILE_SIZE.key -> "false",
+      DataSourceReadOptions.INCREMENTAL_FALLBACK_TO_FULL_TABLE_SCAN.key -> 
"false"))
+    val size = fileIndex.sizeInBytes
+    assertTrue(size > 0 && size < Long.MaxValue, s"Expected the affected files 
size but got $size")

Review Comment:
   non-blocking: with a single commit read from `000`, the affected files are 
the whole table, and `size > 0 && size < Long.MaxValue` would also pass for the 
whole-table size or any other positive number. Could the test add a second 
commit as an upsert (so the MOR arm gets log files) and assert that the size 
for the second commit's range equals the sum of that commit's write-stat file 
sizes?



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