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Split out CreateCast into src/backend/catalog/pg_cast.c

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This catalog-handling code was previously together with the rest of
CastCreate() in src/backend/commands/functioncmds.c.  A future patch
will need a way to add casts internally, so this will be useful to have
separate.

Also, move the nearby get_cast_oid() function from functioncmds.c to
lsyscache.c, which seems a more natural place for it.

Author: Paul Jungwirth, minor edits by Álvaro
Discussion: https://postgr.es/m/20200309210003.GA19992@alvherre.pgsql
This commit is contained in:
Alvaro Herrera
2020-03-10 11:28:23 -03:00
parent 0a42a2e9ce
commit 40b3e2c201
8 changed files with 164 additions and 98 deletions
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src/include/utils/lsyscache.h
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@@ -90,6 +90,7 @@ extern char get_attgenerated(Oid relid, AttrNumber attnum);
extern Oid get_atttype(Oid relid, AttrNumber attnum);
extern void get_atttypetypmodcoll(Oid relid, AttrNumber attnum,
Oid *typid, int32 *typmod, Oid *collid);
extern Oid get_cast_oid(Oid sourcetypeid, Oid targettypeid, bool missing_ok);
extern char *get_collation_name(Oid colloid);
extern bool get_collation_isdeterministic(Oid colloid);
extern char *get_constraint_name(Oid conoid);