[jira] [Created] (SPARK-32030) Support unlimited MATCHED and NOT MATCHED clauses in MERGE INTO

["Xianyin Xin (Jira)" <ji...@apache.org>]

Xianyin Xin created SPARK-32030:
-----------------------------------

             Summary: Support unlimited MATCHED and NOT MATCHED clauses in MERGE INTO
                 Key: SPARK-32030
                 URL: https://issues.apache.org/jira/browse/SPARK-32030
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.1
            Reporter: Xianyin Xin


Now the MERGE INTO syntax is,
```
MERGE INTO [db_name.]target_table [AS target_alias]
USING [db_name.]source_table [<time_travel_version>] [AS source_alias]
ON <merge_condition>
[ WHEN MATCHED [ AND <condition> ] THEN <matched_action> ]
[ WHEN MATCHED [ AND <condition> ] THEN <matched_action> ]
[ WHEN NOT MATCHED [ AND <condition> ]  THEN <not_matched_action> ]
```
It would be nice if we support unlimited MATCHED and NOT MATCHED clauses in MERGE INTO statement, because users may want to deal with different "AND <condition>"s, the result of which just like a series of "CASE WHEN"s. The expected syntax looks like
```
MERGE INTO [db_name.]target_table [AS target_alias]
USING [db_name.]source_table [<time_travel_version>] [AS source_alias]
ON <merge_condition>
[when_clause [, ...]]
```
where `when_clause` is 
```
WHEN MATCHED [ AND <condition> ] THEN <matched_action>
```
or
```
WHEN NOT MATCHED [ AND <condition> ]  THEN <not_matched_action>
```




--
This message was sent by Atlassian Jira
(v8.3.4#803005)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org