[jira] [Created] (IGNITE-14214) Incorrect merge query when using oracle dialect

[Anton Vinogradov (Jira)]

Yaroslav Molochkov created IGNITE-14214:
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             Summary: Incorrect merge query when using oracle dialect
                 Key: IGNITE-14214
                 URL: https://issues.apache.org/jira/browse/IGNITE-14214
             Project: Ignite
          Issue Type: Bug
            Reporter: Yaroslav Molochkov
            Assignee: Yaroslav Molochkov


If table contains only keys (e.g. relationship table) then returned query contains empty update fields and resulting syntax is incorrect. 

Consider the following example:

org.apache.ignite.cache.store.jdbc.dialect.OracleDialect#mergeQuery accepts key and val collections. The problem is relevant if val collection is empty.
{code:java}
return String.format("MERGE INTO %s t" +
    " USING (SELECT %s FROM dual) v" +
    "  ON %s" +
    " WHEN MATCHED THEN" +
    "  UPDATE SET %s" +
    " WHEN NOT MATCHED THEN" +
    "  INSERT (%s) VALUES (%s)", fullTblName, selCols, match, setCols, colsLst, valuesCols);
{code}



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