[GRASS5] PATCH: sql expression parser

[Daniel Calvelo Aros]

Hi all.

Earlier, I queried about sql expressions in where clauses. Glynn proposed a
fix for that using additional rules to cope with operator precedence. I attach
a patch that uses the precedence directives available to bison. This allows
for eg:

select cat from blah where (col1/(col2+col3)-col4)=1

However, I'm unsure about %left and ilk directives in older yaccs; could
anybody confirm this works in non-GNU yaccs? If so, please test this patch, it
is a bugfix actually.

Daniel.

-- Daniel Calvelo Aros

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