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commit 01d31f6ed30d2f1ed37eaaad705797e0a46c68f4
Author: Jark Wu <[email protected]>
AuthorDate: Fri Aug 5 20:31:16 2022 +0800

    [FLINK-27217][hive] Improve default partition test cases
    
    This closes #19450
---
 .../flink/connectors/hive/HiveDialectITCase.java   | 24 ++++++++++++----------
 .../connectors/hive/HiveTableSourceITCase.java     |  2 +-
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git 
a/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveDialectITCase.java
 
b/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveDialectITCase.java
index f3975885f23..0285fc3a4c7 100644
--- 
a/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveDialectITCase.java
+++ 
b/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveDialectITCase.java
@@ -971,27 +971,29 @@ public class HiveDialectITCase {
                                 .collect());
         assertThat(partitions).hasSize(1);
         assertThat(partitions.toString()).contains("dt=2020-04-30 
01:02:03/country=china");
+
+        // set a deterministic default partition name
+        tableEnv.executeSql("set 
hiveconf:hive.exec.default.partition.name=_DEFAULT_");
         // show partitions for the table containing default partition
         tableEnv.executeSql("create table tb1 (a string) partitioned by (c 
int)");
         tableEnv.executeSql(
                         "INSERT OVERWRITE TABLE tb1 PARTITION (c) values 
('Col1', null), ('Col1', 5)")
                 .await();
-        String defaultPartitionName =
-                
hiveCatalog.getHiveConf().getVar(HiveConf.ConfVars.DEFAULTPARTITIONNAME);
-
+        // show partitions should include the null partition
         partitions =
                 CollectionUtil.iteratorToList(tableEnv.executeSql("show 
partitions tb1").collect());
-        assertThat(partitions.toString())
-                .isEqualTo(String.format("[+I[c=5], +I[c=%s]]", 
defaultPartitionName));
+        assertThat(partitions.toString()).isEqualTo("[+I[c=5], 
+I[c=_DEFAULT_]]");
+        // show specific null partition
         partitions =
                 CollectionUtil.iteratorToList(
-                        tableEnv.executeSql(
-                                        String.format(
-                                                "show partitions tb1 partition 
(c='%s')",
-                                                defaultPartitionName))
+                        tableEnv.executeSql("show partitions tb1 partition 
(c='_DEFAULT_')")
                                 .collect());
-        assertThat(partitions.toString())
-                .isEqualTo(String.format("[+I[c=%s]]", defaultPartitionName));
+        assertThat(partitions.toString()).isEqualTo("[+I[c=_DEFAULT_]]");
+        // drop null partition should also work
+        tableEnv.executeSql("ALTER TABLE tb1 DROP PARTITION (c='_DEFAULT_')");
+        partitions =
+                CollectionUtil.iteratorToList(tableEnv.executeSql("show 
partitions tb1").collect());
+        assertThat(partitions.toString()).isEqualTo("[+I[c=5]]");
     }
 
     @Test
diff --git 
a/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveTableSourceITCase.java
 
b/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveTableSourceITCase.java
index dc98c4743f0..31ee7de2113 100644
--- 
a/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveTableSourceITCase.java
+++ 
b/flink-connectors/flink-connector-hive/src/test/java/org/apache/flink/connectors/hive/HiveTableSourceITCase.java
@@ -226,7 +226,7 @@ public class HiveTableSourceITCase extends 
BatchAbstractTestBase {
                 .executeSql(
                         "insert into source_db.test_table_pt_1 values ('2014', 
1, null), ('2015', 2, null)")
                 .await();
-        // currently, the expression "is null" is supported 
HiveCatalog#listPartitionsByFilter,
+        // currently, the expression "is null" is not supported 
HiveCatalog#listPartitionsByFilter,
         // then the planer will list all partitions and then prue the 
partitions.
         // the test is to cover such case
         src =

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