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From "Rick Hillegas (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-565) Misleading parser diagnostics
Date Tue, 13 Sep 2005 18:23:54 GMT
Misleading parser diagnostics
-----------------------------

         Key: DERBY-565
         URL: http://issues.apache.org/jira/browse/DERBY-565
     Project: Derby
        Type: Bug
    Reporter: Rick Hillegas
    Priority: Minor


Bryan Pendleton reports:

When I mistype 'join' as 'joing', the error message that I
get actually complains about the word 'left'. It ought to,
in my opinion, complain about the word 'joing', since that
is truly the word with the syntax error in it.

ij> select * from t1 left outer joing t2 on t1.c2=t2.c1;
ERROR 42X01: Syntax error: Encountered "left" at line 1, column 18.

I don't know if this is a PITA to fix or not, but I thought
I'd send it along anyway since it was so easy to reproduce. 

-------------------------------------------------------

This appears to be a problem with hand-coded lookahead logic. Although fixing this particular
lookahead issue might be trivial, this is part of a larger problem since the parser is liberally
peppered with similar hand-coded lookahead logic. Coming up with a general solution might
involve some creativity.

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