Logging parameters values on bind error

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Hi,

We were struggling today with some java code binding values violating
some constraints in a prepared statement.

We don't own the code and couldn't make tests with it. So we tried to
find if PostgreSQL was able to log binded values when the BIND
operation fail and found that this is not possible in current release:
the error raised while planing the statement is not caught.

PFA a patch that catch any error while creating the query plan and add
parameters values to the error message if log_statement or
log_min_duration_statement would have logged it.

Comments?
- --
Jehan-Guillaume de Rorthais
http://www.dalibo.com
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