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https://issues.apache.org/jira/browse/DERBY-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750063#comment-13750063
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Knut Anders Hatlen commented on DERBY-3155:
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I noticed that JavaCC now emits a warning. Looks like it started with revision
1516157.
genParser:
[echo] Generating SQL parser...
[java] Java Compiler Compiler Version 4.0 (Parser Generator)
[java] (type "javacc" with no arguments for help)
[java] Reading from file sqlgrammar.jj . . .
[java] Note: UNICODE_INPUT option is specified. Please make sure you
create the parser/lexer using a Reader with the correct character encoding.
[java] Warning: Choice conflict in (...)* construct at line 8313, column
31.
[java] Expansion nested within construct and expansion following
construct
[java] have common prefixes, one of which is: ","
[java] Consider using a lookahead of 2 or more for nested
expansion.
[java] File "TokenMgrError.java" does not exist. Will create one.
[java] File "ParseException.java" does not exist. Will create one.
[java] File "Token.java" does not exist. Will create one.
[java] File "CharStream.java" does not exist. Will create one.
[java] Parser generated with 0 errors and 1 warnings.
> Support for SQL:2003 MERGE statement
> ------------------------------------
>
> Key: DERBY-3155
> URL: https://issues.apache.org/jira/browse/DERBY-3155
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Trejkaz
> Assignee: Rick Hillegas
> Labels: derby_triage10_10
> Attachments: derby-3155-01-ac-grammar.diff, MergeStatement.html,
> MergeStatement.html
>
>
> A relatively common piece of logic in a database application is to check for
> a row's existence and then either update or insert depending on its existence.
> SQL:2003 added a MERGE statement to perform this operation. It looks like
> this:
> MERGE INTO table_name USING table_name ON (condition)
> WHEN MATCHED THEN UPDATE SET column1 = value1 [, column2 = value2 ...]
> WHEN NOT MATCHED THEN INSERT column1 [, column2 ...] VALUES (value1 [,
> value2 ...])
> At the moment, the only workaround for this would be to write a stored
> procedure to do the same operation, or to implement the logic client-side.
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