Re: A really subtle lexer bug

>>>>> "Andrew" == Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:

Andrew> select f(a =>-1); -- ERROR: column "a" does not exist

Andrew> I guess the fix is to extend the existing special case code
Andrew> that checks for one character left after removing trailing [+-]
Andrew> and also check for the two-character ops "<>" ">=" "<=" "=>"
Andrew> "!=".

Patch attached.

This fixes two bugs: first the mis-lexing of two-char ops as mentioned
originally; second, the O(N^3) lexing time of strings of - or +
characters is reduced to O(N^2) (in practice it's better than O(N^2)
once N gets large because the bison stack gets blown out, ending the
loop early).

--
Andrew (irc:RhodiumToad)