zhangjun0x01 commented on a change in pull request #1936:
URL: https://github.com/apache/iceberg/pull/1936#discussion_r555468396
##########
File path:
flink/src/test/java/org/apache/iceberg/flink/TestFlinkTableSource.java
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@@ -103,4 +124,45 @@ public void testLimitPushDown() {
Assert.assertEquals("should have 1 record", 1, mixedResult.size());
Assert.assertArrayEquals("Should produce the expected records",
mixedResult.get(0), new Object[] {1, "a"});
}
+
+ @Test
+ public void testParallelismOptimize() {
+ sql("INSERT INTO %s VALUES (1,'hello')", TABLE_NAME);
+ sql("INSERT INTO %s VALUES (2,'iceberg')", TABLE_NAME);
+
+ TableEnvironment tenv = getTableEnv();
+
+ // empty table ,parallelism at least 1
+ Table tableEmpty = tenv.sqlQuery(String.format("SELECT * FROM %s",
TABLE_NAME));
+ testParallelismSettingTranslateAndAssert(1, tableEmpty, tenv);
+
+ // make sure to generate 2 CombinedScanTasks
+ org.apache.iceberg.Table table =
validationCatalog.loadTable(TableIdentifier.of(icebergNamespace, TABLE_NAME));
+ Stream<FileScanTask> stream =
StreamSupport.stream(table.newScan().planFiles().spliterator(), false);
+ Optional<FileScanTask> fileScanTaskOptional =
stream.max(Comparator.comparing(FileScanTask::length));
+ Assert.assertTrue(fileScanTaskOptional.isPresent());
+ long maxFileLen = fileScanTaskOptional.get().length();
+ sql("ALTER TABLE %s SET ('read.split.open-file-cost'='1',
'read.split.target-size'='%s')", TABLE_NAME, maxFileLen);
+
+ // 2 splits ,the parallelism is 2
+ Table tableSelect = tenv.sqlQuery(String.format("SELECT * FROM %s",
TABLE_NAME));
+ testParallelismSettingTranslateAndAssert(2, tableSelect, tenv);
+
+ // 2 splits and limit is 1 ,the parallelism is 1
+ Table tableLimit = tenv.sqlQuery(String.format("SELECT * FROM %s LIMIT 1",
TABLE_NAME));
+ testParallelismSettingTranslateAndAssert(1, tableLimit, tenv);
+ }
+
+ private void testParallelismSettingTranslateAndAssert(int expected, Table
table, TableEnvironment tEnv) {
Review comment:
Here we need to get the parallelism of an Operator. It is indeed get by
using the flink internal code, because I have not found other ways to obtain
the parallelism.
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