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Make UNKNOWN into an actual pseudo-type.

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Previously, type "unknown" was labeled as a base type in pg_type, which
perhaps had some sense to it because you were allowed to create tables with
unknown-type columns.  But now that we don't allow that, it makes more
sense to label it a pseudo-type.  This has the additional effects of
forbidding use of "unknown" as a domain base type, cast source or target
type, PL function argument or result type, or plpgsql local variable type;
all of which seem like good holes to plug.

Discussion: https://postgr.es/m/CAH2L28uwwbL9HUM-WR=hromW1Cvamkn7O-g8fPY2m=_7muJ0oA@mail.gmail.com
This commit is contained in:
Tom Lane
2017-01-25 09:27:09 -05:00
parent 1e7c4bb004
commit d8d32d9a56
12 changed files with 26 additions and 17 deletions
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2
doc/src/sgml/plhandler.sgml
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@@ -26,7 +26,7 @@
language such as C, using the version-1 interface, and registered
with <productname>PostgreSQL</productname> as taking no arguments
and returning the type <type>language_handler</type>. This
special pseudotype identifies the function as a call handler and
special pseudo-type identifies the function as a call handler and
prevents it from being called directly in SQL commands.
For more details on C language calling conventions and dynamic loading,
see <xref linkend="xfunc-c">.