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Replace the hard-wired type knowledge in TypeCategory() and IsPreferredType()

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with system catalog lookups, as was foreseen to be necessary almost since
their creation.  Instead put the information into two new pg_type columns,
typcategory and typispreferred.  Add support for setting these when
creating a user-defined base type.

The category column is just a "char" (i.e. a poor man's enum), allowing
a crude form of user extensibility of the category list: just use an
otherwise-unused character.  This seems sufficient for foreseen uses,
but we could upgrade to having an actual category catalog someday, if
there proves to be a huge demand for custom type categories.

In this patch I have attempted to hew exactly to the behavior of the
previous hardwired logic, except for introducing new type categories for
arrays, composites, and enums.  In particular the default preferred state
for user-defined types remains TRUE.  That seems worth revisiting, but it
should be done as a separate patch from introducing the infrastructure.
Likewise, any adjustment of the standard set of categories should be done
separately.
This commit is contained in:
Tom Lane
2008-07-30 17:05:05 +00:00
parent ab9907f5e5
commit bac3e83622
20 changed files with 617 additions and 497 deletions
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5
src/include/utils/lsyscache.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.123 2008/04/13 20:51:21 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.124 2008/07/30 17:05:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -106,6 +106,9 @@ extern Node *get_typdefault(Oid typid);
extern char get_typtype(Oid typid);
extern bool type_is_rowtype(Oid typid);
extern bool type_is_enum(Oid typid);
extern void get_type_category_preferred(Oid typid,
char *typcategory,
bool *typispreferred);
extern Oid get_typ_typrelid(Oid typid);
extern Oid get_element_type(Oid typid);
extern Oid get_array_type(Oid typid);