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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/07/29 12:53:45 UTC
[GitHub] [spark] wangyum commented on issue #25288: [SPARK-28036] [SQL]
Built-in udf left/right has inconsistent behavior with postgresql
wangyum commented on issue #25288: [SPARK-28036] [SQL] Built-in udf left/right has inconsistent behavior with postgresql
URL: https://github.com/apache/spark/pull/25288#issuecomment-515978968
**Vertica**:
```sql
dbadmin=> select left('ahoj', -2), right('ahoj', -2);
ERROR 4039: Negative substring length not allowed
```
**DB2**:
```sql
[db2inst1@2f3c821d36b7 ~]$ db2 "select left('ahoj', -2), right('ahoj', -2) from table (sysproc.env_get_inst_info())"
SQL0138N A numeric argument of a built-in string function is out of range.
SQLSTATE=22011
```
**SQLServer**:
```sql
1> select left('ahoj', -2), right('ahoj', -2)
2> go
Msg 536, Level 16, State 6, Server 8c82b3c03354, Line 1
Invalid length parameter passed to the left function.
```
**TeraData**:
**MariaDB**:
```
MariaDB [(none)]> select left('ahoj', -2), right('ahoj', -2);
+------------------+-------------------+
| left('ahoj', -2) | right('ahoj', -2) |
+------------------+-------------------+
| | |
+------------------+-------------------+
1 row in set (0.000 sec)
```
Thank you @LiShuMing. But I'm not sure if we need this fix. Most DBs are not allowed negative
value.
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