[HUDI-1427] Fix FileAlreadyExistsException when set HOODIE_AUTO_COMMIT_PROP to true (#2295)

hudi-spark/src/test/scala/org/apache/hudi/functional/TestCOWDataSource.scala

@@ -307,4 +307,17 @@ class TestCOWDataSource extends HoodieClientTestBase {
       }
     })
   }
+
+  @Test def testWithAutoCommitOn(): Unit = {
+    val records1 = recordsToStrings(dataGen.generateInserts("000", 100)).toList
+    val inputDF1 = spark.read.json(spark.sparkContext.parallelize(records1, 2))
+    inputDF1.write.format("org.apache.hudi")
+      .options(commonOpts)
+      .option(DataSourceWriteOptions.OPERATION_OPT_KEY, DataSourceWriteOptions.INSERT_OPERATION_OPT_VAL)
+      .option(HoodieWriteConfig.HOODIE_AUTO_COMMIT_PROP, "true")
+      .mode(SaveMode.Overwrite)
+      .save(basePath)
+
+    assertTrue(HoodieDataSourceHelpers.hasNewCommits(fs, basePath, "000"))
+  }
 }