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Clarify error message and documentation related to typed tables.

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We restrict typed tables (those declared as "OF composite_type")
to be based on stand-alone composite types, not composite types
that are the implicitly-created rowtypes of other tables.
But if you tried to do that, you got the very confusing error
message "type foo is not a composite type".  Provide a more specific
message for that case.  Also clarify related documentation in the
CREATE TABLE man page.

Erik Wienhold and David G. Johnston, per complaint from Hannu Krosing.

Discussion: https://postgr.es/m/CAMT0RQRysCb_Amy5CTENSc5GfsvXL1a4qX3mv_hx31_v74P==g@mail.gmail.com
This commit is contained in:
Tom Lane
2024-07-26 12:39:45 -04:00
parent c883453cb2
commit 5d1d8b3c82
4 changed files with 26 additions and 10 deletions
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9
src/backend/commands/tablecmds.c
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@ -6962,8 +6962,15 @@ check_of_type(HeapTuple typetuple)
* the type before the typed table creation/conversion commits.
*/
relation_close(typeRelation, NoLock);
if (!typeOk)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("type %s is the row type of another table",
format_type_be(typ->oid)),
errdetail("A typed table must use a stand-alone composite type created with CREATE TYPE.")));
}
if (!typeOk)
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("type %s is not a composite type",