On my way to do something else entirely, I came across a couple of
things that are not very nice about psql's lexer:
1. Somebody broke the no-backtracking property back in 9.0 while adding
quoted variable substitution. According to the flex manual, use of
backtracking creates a performance
On Thu, Aug 25, 2011 at 12:47 PM, Tom Lane t...@sss.pgh.pa.us wrote:
On my way to do something else entirely, I came across a couple of
things that are not very nice about psql's lexer:
1. Somebody broke the no-backtracking property back in 9.0 while adding
quoted variable substitution.
Robert Haas robertmh...@gmail.com writes:
On Thu, Aug 25, 2011 at 12:47 PM, Tom Lane t...@sss.pgh.pa.us wrote:
1. Somebody broke the no-backtracking property back in 9.0 while adding
quoted variable substitution. According to the flex manual, use of
backtracking creates a performance penalty.
Excerpts from Tom Lane's message of jue ago 25 14:00:57 -0300 2011:
Robert Haas robertmh...@gmail.com writes:
On Thu, Aug 25, 2011 at 12:47 PM, Tom Lane t...@sss.pgh.pa.us wrote:
1. Somebody broke the no-backtracking property back in 9.0 while adding
quoted variable substitution. According
On 08/25/2011 01:16 PM, Alvaro Herrera wrote:
Excerpts from Tom Lane's message of jue ago 25 14:00:57 -0300 2011:
Robert Haasrobertmh...@gmail.com writes:
On Thu, Aug 25, 2011 at 12:47 PM, Tom Lanet...@sss.pgh.pa.us wrote:
1. Somebody broke the no-backtracking property back in 9.0 while
Andrew Dunstan and...@dunslane.net writes:
We could just add -b unconditionally to the flex flags and then count
the number of lines in lex.backup. If it's greater that 1 whine loudly,
or even fail, otherwise remove lex.backup. Would that avoid locale
dependencies?
Hm, yeah, seems like
I wrote:
Andrew Dunstan and...@dunslane.net writes:
We could just add -b unconditionally to the flex flags and then count
the number of lines in lex.backup. If it's greater that 1 whine loudly,
or even fail, otherwise remove lex.backup. Would that avoid locale
dependencies?
Hm, yeah,
While I'm looking at this ... the current implementation has got a
number of very inconsistent behaviors with respect to when it will
expand a variable reference within a psql meta-command argument.
Observe:
regression=# \set foo 'value of foo'
regression=# \set bar 'value of bar'
regression=#
On Thu, Aug 25, 2011 at 5:12 PM, Tom Lane t...@sss.pgh.pa.us wrote:
While I'm looking at this ... the current implementation has got a
number of very inconsistent behaviors with respect to when it will
expand a variable reference within a psql meta-command argument.
Observe:
regression=#
On 08/25/2011 02:45 PM, Tom Lane wrote:
I wrote:
Andrew Dunstanand...@dunslane.net writes:
We could just add -b unconditionally to the flex flags and then count
the number of lines in lex.backup. If it's greater that 1 whine loudly,
or even fail, otherwise remove lex.backup. Would that
Robert Haas robertmh...@gmail.com writes:
On Thu, Aug 25, 2011 at 5:12 PM, Tom Lane t...@sss.pgh.pa.us wrote:
ISTM the general rule ought to be that we attempt to substitute for a
colon-construct regardless of where it appears within an argument, as
long as it's not within quotes.
My main
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