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Support domains over composite types.

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This is the last major omission in our domains feature: you can now
make a domain over anything that's not a pseudotype.

The major complication from an implementation standpoint is that places
that might be creating tuples of a domain type now need to be prepared
to apply domain_check().  It seems better that unprepared code fail
with an error like "<type> is not composite" than that it silently fail
to apply domain constraints.  Therefore, relevant infrastructure like
get_func_result_type() and lookup_rowtype_tupdesc() has been adjusted
to treat domain-over-composite as a distinct case that unprepared code
won't recognize, rather than just transparently treating it the same
as plain composite.  This isn't a 100% solution to the possibility of
overlooked domain checks, but it catches most places.

In passing, improve typcache.c's support for domains (it can now cache
the identity of a domain's base type), and rewrite the argument handling
logic in jsonfuncs.c's populate_record[set]_worker to reduce duplicative
per-call lookups.

I believe this is code-complete so far as the core and contrib code go.
The PLs need varying amounts of work, which will be tackled in followup
patches.

Discussion: https://postgr.es/m/4206.1499798337@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2017-10-26 13:47:45 -04:00
parent 08f1e1f0a4
commit 37a795a60b
37 changed files with 1085 additions and 293 deletions
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9
src/backend/catalog/pg_inherits.c
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@@ -301,6 +301,11 @@ has_superclass(Oid relationId)
/*
* Given two type OIDs, determine whether the first is a complex type
* (class type) that inherits from the second.
*
* This essentially asks whether the first type is guaranteed to be coercible
* to the second. Therefore, we allow the first type to be a domain over a
* complex type that inherits from the second; that creates no difficulties.
* But the second type cannot be a domain.
*/
bool
typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
@@ -314,9 +319,9 @@ typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId)
ListCell *queue_item;
/* We need to work with the associated relation OIDs */
subclassRelid = typeidTypeRelid(subclassTypeId);
subclassRelid = typeOrDomainTypeRelid(subclassTypeId);
if (subclassRelid == InvalidOid)
return false; /* not a complex type */
return false; /* not a complex type or domain over one */
superclassRelid = typeidTypeRelid(superclassTypeId);
if (superclassRelid == InvalidOid)
return false; /* not a complex type */