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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4369) Give a more useful error message when join specification is missing
Date Sun, 06 Sep 2009 09:57:57 GMT
Give a more useful error message when join specification is missing

                 Key: DERBY-4369
                 URL: https://issues.apache.org/jira/browse/DERBY-4369
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions:
            Reporter: Knut Anders Hatlen
            Assignee: Knut Anders Hatlen
            Priority: Minor

Currently, if a join is missing a join specification, we see the following rather cryptic

ij> select * from t1 join t2;
ERROR 42X01: Syntax error: Encountered "<EOF>" at line 1, column 24.
Issue the 'help' command for general information on IJ command syntax.
Any unrecognized commands are treated as potential SQL commands and executed directly.
Consult your DBMS server reference documentation for details of the SQL syntax supported by
your server.

The parser already has code to check if the join specification is missing, but since the join
specification is required in the grammar, we'll never get to that point in the code if it
is missing. If we make the join specification optional in the grammar, the code path with
the more helpful message will be enabled, and we'll see this instead:

ij> select * from t1 join t2;
ERROR 42Y11: A join specification is required with the 'INNER JOIN' clause.

This will make it clearer what the problem is.

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