Patch to add support of "IF NOT EXISTS" to others "CREATE" statements

Hi all,

I working in a patch to include support of "IF NOT EXISTS" into "CREATE"
statements that not have it yet.

I started with "DefineStmt" section from "src/backend/parser/gram.y":
- CREATE AGGREGATE [ IF NOT EXISTS ] ...
- CREATE OPERATOR [ IF NOT EXISTS ] ...
- CREATE TYPE [ IF NOT EXISTS ] ... [AS [{ENUM | RANGE}] (...)]
- CREATE TEXT SEARCH {PARSER | DITIONARY | TEMPLATE | CONFIGURATION} [ IF
NOT EXISTS ] ...
- CREATE COLLATION [ IF NOT EXISTS ] ...

My intention is cover anothers CREATE statements too, not just the above.

If has no objection about this implementation I'll finish him and soon I
sent the patch.

Regards,

--
Fabrízio de Royes Mello
Consultoria/Coaching PostgreSQL
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