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When parse.pl processes braces, it does not take into account that
braces could also be their own token if single quoted ('{', '}').
This is not currently used but a future patch wants to make use of it.
This fixes that by using lookaround assertions to detect the quotes.
To make sure all Perl versions in play support this and to avoid
surprises later on, let's give this a spin on the buildfarm now. It
can exist independently of future work.
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/a855795d-e697-4fa5-8698-d20122126567@eisentraut.org
src/interfaces/ecpg/README.dynSQL
descriptor statements have the following shortcomings
- input descriptors (USING DESCRIPTOR <name>) are not supported
Reason: to fully support dynamic SQL the frontend/backend communication
should change to recognize input parameters.
Since this is not likely to happen in the near future and you
can cover the same functionality with the existing infrastructure
(using s[n]printf), I'll leave the work to someone else.