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Commit3752e85

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committed
Determine the set of constraints applied to a domain at executor
startup, not in the parser; this allows ALTER DOMAIN to work correctlywith domain constraint operations stored in rules. Rod Taylor;code review by Tom Lane.
1 parent464598b commit3752e85

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24 files changed

+524
-339
lines changed

24 files changed

+524
-339
lines changed

‎src/backend/commands/copy.c

Lines changed: 11 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
*
1010
*
1111
* IDENTIFICATION
12-
* $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.188 2003/01/10 22:03:27 petere Exp $
12+
* $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.189 2003/02/03 21:15:43 tgl Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -853,7 +853,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
853853
}
854854
}
855855

856-
/* If it's a domain type,get info on domain constraints */
856+
/* If it's a domain type,set up to check domain constraints */
857857
if (get_typtype(attr[i]->atttypid)=='d')
858858
{
859859
Param*prm;
@@ -863,25 +863,23 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
863863
* Easiest way to do this is to use parse_coerce.c to set up
864864
* an expression that checks the constraints. (At present,
865865
* the expression might contain a length-coercion-function call
866-
* and/orConstraintTest nodes.) The bottom of the expression
866+
* and/orCoerceToDomain nodes.) The bottom of the expression
867867
* is a Param node so that we can fill in the actual datum during
868868
* the data input loop.
869869
*/
870870
prm=makeNode(Param);
871871
prm->paramkind=PARAM_EXEC;
872872
prm->paramid=0;
873-
prm->paramtype=attr[i]->atttypid;
873+
prm->paramtype=getBaseType(attr[i]->atttypid);
874874

875-
node=coerce_type_constraints((Node*)prm,attr[i]->atttypid,
876-
COERCE_IMPLICIT_CAST);
875+
node=coerce_to_domain((Node*)prm,
876+
prm->paramtype,
877+
attr[i]->atttypid,
878+
COERCE_IMPLICIT_CAST);
877879

878-
/* check whether any constraints actually found */
879-
if (node!= (Node*)prm)
880-
{
881-
constraintexprs[i]=ExecPrepareExpr((Expr*)node,
882-
estate);
883-
hasConstraints= true;
884-
}
880+
constraintexprs[i]=ExecPrepareExpr((Expr*)node,
881+
estate);
882+
hasConstraints= true;
885883
}
886884
}
887885

‎src/backend/commands/typecmds.c

Lines changed: 125 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/commands/typecmds.c,v 1.29 2003/01/08 22:06:23 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/commands/typecmds.c,v 1.30 2003/02/03 21:15:43 tgl Exp $
1212
*
1313
* DESCRIPTION
1414
* The "DefineFoo" routines take the parse tree and pick out the
@@ -46,8 +46,10 @@
4646
#include"commands/typecmds.h"
4747
#include"executor/executor.h"
4848
#include"miscadmin.h"
49+
#include"nodes/execnodes.h"
4950
#include"nodes/nodes.h"
5051
#include"optimizer/clauses.h"
52+
#include"optimizer/planmain.h"
5153
#include"optimizer/var.h"
5254
#include"parser/parse_coerce.h"
5355
#include"parser/parse_expr.h"
@@ -1555,7 +1557,7 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
15551557
char*ccsrc;
15561558
char*ccbin;
15571559
ParseState*pstate;
1558-
ConstraintTestValue*domVal;
1560+
CoerceToDomainValue*domVal;
15591561

15601562
/*
15611563
* Assign or validate constraint name
@@ -1582,13 +1584,13 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
15821584
pstate=make_parsestate(NULL);
15831585

15841586
/*
1585-
* Set up aConstraintTestValue to represent the occurrence of VALUE
1587+
* Set up aCoerceToDomainValue to represent the occurrence of VALUE
15861588
* in the expression. Note that it will appear to have the type of the
15871589
* base type, not the domain. This seems correct since within the
15881590
* check expression, we should not assume the input value can be considered
15891591
* a member of the domain.
15901592
*/
1591-
domVal=makeNode(ConstraintTestValue);
1593+
domVal=makeNode(CoerceToDomainValue);
15921594
domVal->typeId=baseTypeOid;
15931595
domVal->typeMod=typMod;
15941596

@@ -1669,6 +1671,125 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
16691671
returnccbin;
16701672
}
16711673

1674+
/*
1675+
* GetDomainConstraints - get a list of the current constraints of domain
1676+
*
1677+
* Returns a possibly-empty list of DomainConstraintState nodes.
1678+
*
1679+
* This is called by the executor during plan startup for a CoerceToDomain
1680+
* expression node. The given constraints will be checked for each value
1681+
* passed through the node.
1682+
*/
1683+
List*
1684+
GetDomainConstraints(OidtypeOid)
1685+
{
1686+
List*result=NIL;
1687+
boolnotNull= false;
1688+
RelationconRel;
1689+
1690+
conRel=heap_openr(ConstraintRelationName,AccessShareLock);
1691+
1692+
for (;;)
1693+
{
1694+
HeapTupletup;
1695+
HeapTupleconTup;
1696+
Form_pg_typetypTup;
1697+
ScanKeyDatakey[1];
1698+
SysScanDescscan;
1699+
1700+
tup=SearchSysCache(TYPEOID,
1701+
ObjectIdGetDatum(typeOid),
1702+
0,0,0);
1703+
if (!HeapTupleIsValid(tup))
1704+
elog(ERROR,"GetDomainConstraints: failed to lookup type %u",
1705+
typeOid);
1706+
typTup= (Form_pg_type)GETSTRUCT(tup);
1707+
1708+
/* Test for NOT NULL Constraint */
1709+
if (typTup->typnotnull)
1710+
notNull= true;
1711+
1712+
/* Look for CHECK Constraints on this domain */
1713+
ScanKeyEntryInitialize(&key[0],0x0,
1714+
Anum_pg_constraint_contypid,F_OIDEQ,
1715+
ObjectIdGetDatum(typeOid));
1716+
1717+
scan=systable_beginscan(conRel,ConstraintTypidIndex, true,
1718+
SnapshotNow,1,key);
1719+
1720+
while (HeapTupleIsValid(conTup=systable_getnext(scan)))
1721+
{
1722+
Form_pg_constraintc= (Form_pg_constraint)GETSTRUCT(conTup);
1723+
Datumval;
1724+
boolisNull;
1725+
Expr*check_expr;
1726+
DomainConstraintState*r;
1727+
1728+
/* Ignore non-CHECK constraints (presently, shouldn't be any) */
1729+
if (c->contype!=CONSTRAINT_CHECK)
1730+
continue;
1731+
1732+
/* Not expecting conbin to be NULL, but we'll test for it anyway */
1733+
val=fastgetattr(conTup,Anum_pg_constraint_conbin,
1734+
conRel->rd_att,&isNull);
1735+
if (isNull)
1736+
elog(ERROR,"GetDomainConstraints: domain %s constraint %s has NULL conbin",
1737+
NameStr(typTup->typname),NameStr(c->conname));
1738+
1739+
check_expr= (Expr*)
1740+
stringToNode(DatumGetCString(DirectFunctionCall1(textout,
1741+
val)));
1742+
1743+
/* ExecInitExpr assumes we already fixed opfuncids */
1744+
fix_opfuncids((Node*)check_expr);
1745+
1746+
r=makeNode(DomainConstraintState);
1747+
r->constrainttype=DOM_CONSTRAINT_CHECK;
1748+
r->name=pstrdup(NameStr(c->conname));
1749+
r->check_expr=ExecInitExpr(check_expr,NULL);
1750+
1751+
/*
1752+
* use lcons() here because constraints of lower domains should
1753+
* be applied earlier.
1754+
*/
1755+
result=lcons(r,result);
1756+
}
1757+
1758+
systable_endscan(scan);
1759+
1760+
if (typTup->typtype!='d')
1761+
{
1762+
/* Not a domain, so done */
1763+
ReleaseSysCache(tup);
1764+
break;
1765+
}
1766+
1767+
/* else loop to next domain in stack */
1768+
typeOid=typTup->typbasetype;
1769+
ReleaseSysCache(tup);
1770+
}
1771+
1772+
heap_close(conRel,AccessShareLock);
1773+
1774+
/*
1775+
* Only need to add one NOT NULL check regardless of how many domains
1776+
* in the stack request it.
1777+
*/
1778+
if (notNull)
1779+
{
1780+
DomainConstraintState*r=makeNode(DomainConstraintState);
1781+
1782+
r->constrainttype=DOM_CONSTRAINT_NOTNULL;
1783+
r->name=pstrdup("NOT NULL");
1784+
r->check_expr=NULL;
1785+
1786+
/* lcons to apply the nullness check FIRST */
1787+
result=lcons(r,result);
1788+
}
1789+
1790+
returnresult;
1791+
}
1792+
16721793
/*
16731794
* ALTER DOMAIN .. OWNER TO
16741795
*

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