[jira] [Commented] (CALCITE-4338) Support MERGE INTO Clause

[zoucao (Jira)]

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https://issues.apache.org/jira/browse/CALCITE-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482240#comment-17482240
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zoucao commented on CALCITE-4338:
---------------------------------

This is a useful function for distributed processing engine and DataLake，big +1 
for this.
I am a new comer, but I found calcite has supported the basic merge statement, 
including parser.jj#SqlMerge, SqlMerge node, SqlValidatorImpl#validateMerge. 
Could anyone tell me the background of the above content, or should this ticket 
be 'enhance merge statement' ?
please feel free if I make some misunderstands.

> Support MERGE INTO Clause
> -------------------------
>
>                 Key: CALCITE-4338
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4338
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Forward Xu
>            Priority: Major
>
> {code:java}
> MERGE INTO target_table 
>  USING source_table 
>  ON search_condition
>  WHEN MATCHED THEN
>  UPDATE SET col1 = value1, col2 = value2,...
>  WHERE <update_condition>
>  [DELETE WHERE <delete_condition>]
>  WHEN NOT MATCHED THEN
>  INSERT (col1,col2,...)
>  values(value1,value2,...)
>  WHERE <insert_condition>;
> {code}



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