[PATCH] Return command tag 'REPLACE X' for CREATE OR REPLACE statements.

Hi list,

Often enough when developing PostgreSQL views and functions, I have
pasted the CREATE OR REPLACE commands into the wrong window/shell and
ran them there without realizing that I'm creating a function in the
wrong database, instead of replacing. Currently psql does not provide
any feedback of which action really occured.

Only after writing this patch I realized that I could instead raise a
NOTICE, like current IF EXISTS/IF NOT EXISTS clauses do. Is that a
better way to solve this?

This patch returns command tag "CREATE X" or "REPLACE X" for
LANGAUGE/VIEW/RULE/FUNCTION. This is done by passing completionTag to
from ProcessUtility to more functions, and adding a 'bool *didUpdate'
argument to some lower-level functions. I'm not sure if passing back
the status in a bool* is considered good style, but this way all the
functions look consistent.

Regards,
Marti