lsyldliu commented on code in PR #21601:
URL: https://github.com/apache/flink/pull/21601#discussion_r1070898438
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flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveDialectQueryITCase.java:
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@@ -1062,6 +1062,63 @@ public void testSumAggWithGroupKey() throws Exception {
tableEnv.executeSql("drop table test_sum_group");
}
+ @Test
+ public void testAvgAggFunctionPlan() {
+ // test explain
+ String actualPlan = explainSql("select x, avg(y) from foo group by x");
+
assertThat(actualPlan).isEqualTo(readFromResource("/explain/testAvgAggFunctionPlan.out"));
+ }
+
+ @Test
+ public void testAvgAggFunction() throws Exception {
+ tableEnv.executeSql(
+ "create table test_avg(a int, x string, y string, z int, f
bigint, d decimal(20, 5), e double)");
+ tableEnv.executeSql(
+ "insert into test_avg values (1, NULL, '2', 1, 2,
2.22, 2.3), "
+ + "(1, NULL, 'b', 2, NULL, 3.33, 3.4), "
+ + "(2, NULL, '4', 1, 2, 4.55, 4.5), "
+ + "(2, NULL, NULL, 4, 3, 5.66, 5.2)")
+ .await();
+
+ // test avg all element is null
+ List<Row> result =
+ CollectionUtil.iteratorToList(
+ tableEnv.executeSql("select avg(x) from
test_avg").collect());
+ assertThat(result.toString()).isEqualTo("[+I[null]]");
+
+ // test avg that some string elements can't convert to double
+ List<Row> result2 =
+ CollectionUtil.iteratorToList(
+ tableEnv.executeSql("select avg(y) from
test_avg").collect());
+ assertThat(result2.toString()).isEqualTo("[+I[3.0]]");
Review Comment:
As the following explains, it should be `[+I[3.0]]`, the null element
doesn't count.
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