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Commit116d2bb

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Add IS UNKNOWN, IS NOT UNKNOWN boolean tests, fix the existing boolean
tests to return the correct results per SQL9x when given NULL inputs.Reimplement these tests as well as IS [NOT] NULL to have their ownexpression node types, instead of depending on special functions.From Joe Conway, with a little help from Tom Lane.
1 parent8c30aca commit116d2bb

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18 files changed

+662
-149
lines changed

18 files changed

+662
-149
lines changed

‎doc/src/sgml/func.sgml‎

Lines changed: 16 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.61 2001/06/15 21:03:07 tgl Exp $ -->
1+
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.62 2001/06/19 22:39:08 tgl Exp $ -->
22

33
<chapter id="functions">
44
<title>Functions and Operators</title>
@@ -273,6 +273,21 @@
273273
<productname>Microsoft Access</productname>) to work, but this may
274274
be discontinued in a future release.
275275
</para>
276+
277+
<para>
278+
Boolean values can be tested using the constructs
279+
<synopsis>
280+
<replaceable>expression</replaceable> IS TRUE
281+
<replaceable>expression</replaceable> IS NOT TRUE
282+
<replaceable>expression</replaceable> IS FALSE
283+
<replaceable>expression</replaceable> IS NOT FALSE
284+
<replaceable>expression</replaceable> IS UNKNOWN
285+
<replaceable>expression</replaceable> IS NOT UNKNOWN
286+
</synopsis>
287+
These are similar to <literal>IS NULL</literal> in that they will
288+
always return TRUE or FALSE, never NULL, even when the operand is NULL.
289+
A NULL input is treated as the logical value UNKNOWN.
290+
</para>
276291
</sect1>
277292

278293

‎doc/src/sgml/syntax.sgml‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.42 2001/05/12 22:51:35 petere Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.43 2001/06/19 22:39:08 tgl Exp $
33
-->
44

55
<chapter id="sql-syntax">
@@ -1060,7 +1060,7 @@ SELECT (5 !) - 6;
10601060
<row>
10611061
<entry><token>IS</token></entry>
10621062
<entry></entry>
1063-
<entry>test for TRUE, FALSE, NULL</entry>
1063+
<entry>test for TRUE, FALSE,UNKNOWN,NULL</entry>
10641064
</row>
10651065

10661066
<row>

‎src/backend/executor/execQual.c‎

Lines changed: 137 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.86 2001/04/1904:29:02 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.87 2001/06/1922:39:11 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -62,6 +62,10 @@ static Datum ExecEvalAnd(Expr *andExpr, ExprContext *econtext, bool *isNull);
6262
staticDatumExecEvalOr(Expr*orExpr,ExprContext*econtext,bool*isNull);
6363
staticDatumExecEvalCase(CaseExpr*caseExpr,ExprContext*econtext,
6464
bool*isNull,ExprDoneCond*isDone);
65+
staticDatumExecEvalNullTest(NullTest*ntest,ExprContext*econtext,
66+
bool*isNull,ExprDoneCond*isDone);
67+
staticDatumExecEvalBooleanTest(BooleanTest*btest,ExprContext*econtext,
68+
bool*isNull,ExprDoneCond*isDone);
6569

6670

6771
/*----------
@@ -1091,6 +1095,126 @@ ExecEvalCase(CaseExpr *caseExpr, ExprContext *econtext,
10911095
return (Datum)0;
10921096
}
10931097

1098+
/* ----------------------------------------------------------------
1099+
*ExecEvalNullTest
1100+
*
1101+
*Evaluate a NullTest node.
1102+
* ----------------------------------------------------------------
1103+
*/
1104+
staticDatum
1105+
ExecEvalNullTest(NullTest*ntest,
1106+
ExprContext*econtext,
1107+
bool*isNull,
1108+
ExprDoneCond*isDone)
1109+
{
1110+
Datumresult;
1111+
1112+
result=ExecEvalExpr(ntest->arg,econtext,isNull,isDone);
1113+
switch (ntest->nulltesttype)
1114+
{
1115+
caseIS_NULL:
1116+
if (*isNull)
1117+
{
1118+
*isNull= false;
1119+
returnBoolGetDatum(true);
1120+
}
1121+
else
1122+
returnBoolGetDatum(false);
1123+
caseIS_NOT_NULL:
1124+
if (*isNull)
1125+
{
1126+
*isNull= false;
1127+
returnBoolGetDatum(false);
1128+
}
1129+
else
1130+
returnBoolGetDatum(true);
1131+
default:
1132+
elog(ERROR,"ExecEvalNullTest: unexpected nulltesttype %d",
1133+
(int)ntest->nulltesttype);
1134+
return (Datum)0;/* keep compiler quiet */
1135+
}
1136+
}
1137+
1138+
/* ----------------------------------------------------------------
1139+
*ExecEvalBooleanTest
1140+
*
1141+
*Evaluate a BooleanTest node.
1142+
* ----------------------------------------------------------------
1143+
*/
1144+
staticDatum
1145+
ExecEvalBooleanTest(BooleanTest*btest,
1146+
ExprContext*econtext,
1147+
bool*isNull,
1148+
ExprDoneCond*isDone)
1149+
{
1150+
Datumresult;
1151+
1152+
result=ExecEvalExpr(btest->arg,econtext,isNull,isDone);
1153+
switch (btest->booltesttype)
1154+
{
1155+
caseIS_TRUE:
1156+
if (*isNull)
1157+
{
1158+
*isNull= false;
1159+
returnBoolGetDatum(false);
1160+
}
1161+
elseif (DatumGetBool(result))
1162+
returnBoolGetDatum(true);
1163+
else
1164+
returnBoolGetDatum(false);
1165+
caseIS_NOT_TRUE:
1166+
if (*isNull)
1167+
{
1168+
*isNull= false;
1169+
returnBoolGetDatum(true);
1170+
}
1171+
elseif (DatumGetBool(result))
1172+
returnBoolGetDatum(false);
1173+
else
1174+
returnBoolGetDatum(true);
1175+
caseIS_FALSE:
1176+
if (*isNull)
1177+
{
1178+
*isNull= false;
1179+
returnBoolGetDatum(false);
1180+
}
1181+
elseif (DatumGetBool(result))
1182+
returnBoolGetDatum(false);
1183+
else
1184+
returnBoolGetDatum(true);
1185+
caseIS_NOT_FALSE:
1186+
if (*isNull)
1187+
{
1188+
*isNull= false;
1189+
returnBoolGetDatum(true);
1190+
}
1191+
elseif (DatumGetBool(result))
1192+
returnBoolGetDatum(true);
1193+
else
1194+
returnBoolGetDatum(false);
1195+
caseIS_UNKNOWN:
1196+
if (*isNull)
1197+
{
1198+
*isNull= false;
1199+
returnBoolGetDatum(true);
1200+
}
1201+
else
1202+
returnBoolGetDatum(false);
1203+
caseIS_NOT_UNKNOWN:
1204+
if (*isNull)
1205+
{
1206+
*isNull= false;
1207+
returnBoolGetDatum(false);
1208+
}
1209+
else
1210+
returnBoolGetDatum(true);
1211+
default:
1212+
elog(ERROR,"ExecEvalBooleanTest: unexpected booltesttype %d",
1213+
(int)btest->booltesttype);
1214+
return (Datum)0;/* keep compiler quiet */
1215+
}
1216+
}
1217+
10941218
/* ----------------------------------------------------------------
10951219
*ExecEvalFieldSelect
10961220
*
@@ -1266,6 +1390,18 @@ ExecEvalExpr(Node *expression,
12661390
isNull,
12671391
isDone);
12681392
break;
1393+
caseT_NullTest:
1394+
retDatum=ExecEvalNullTest((NullTest*)expression,
1395+
econtext,
1396+
isNull,
1397+
isDone);
1398+
break;
1399+
caseT_BooleanTest:
1400+
retDatum=ExecEvalBooleanTest((BooleanTest*)expression,
1401+
econtext,
1402+
isNull,
1403+
isDone);
1404+
break;
12691405

12701406
default:
12711407
elog(ERROR,"ExecEvalExpr: unknown expression type %d",

‎src/backend/nodes/copyfuncs.c‎

Lines changed: 43 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
1515
* Portions Copyright (c) 1994, Regents of the University of California
1616
*
1717
* IDENTIFICATION
18-
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.144 2001/06/09 23:21:54 petere Exp $
18+
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.145 2001/06/19 22:39:11 tgl Exp $
1919
*
2020
*-------------------------------------------------------------------------
2121
*/
@@ -1017,6 +1017,42 @@ _copyCaseWhen(CaseWhen *from)
10171017
returnnewnode;
10181018
}
10191019

1020+
/* ----------------
1021+
*_copyNullTest
1022+
* ----------------
1023+
*/
1024+
staticNullTest*
1025+
_copyNullTest(NullTest*from)
1026+
{
1027+
NullTest*newnode=makeNode(NullTest);
1028+
1029+
/*
1030+
* copy remainder of node
1031+
*/
1032+
Node_Copy(from,newnode,arg);
1033+
newnode->nulltesttype=from->nulltesttype;
1034+
1035+
returnnewnode;
1036+
}
1037+
1038+
/* ----------------
1039+
*_copyBooleanTest
1040+
* ----------------
1041+
*/
1042+
staticBooleanTest*
1043+
_copyBooleanTest(BooleanTest*from)
1044+
{
1045+
BooleanTest*newnode=makeNode(BooleanTest);
1046+
1047+
/*
1048+
* copy remainder of node
1049+
*/
1050+
Node_Copy(from,newnode,arg);
1051+
newnode->booltesttype=from->booltesttype;
1052+
1053+
returnnewnode;
1054+
}
1055+
10201056
staticArrayRef*
10211057
_copyArrayRef(ArrayRef*from)
10221058
{
@@ -2954,6 +2990,12 @@ copyObject(void *from)
29542990
caseT_CaseWhen:
29552991
retval=_copyCaseWhen(from);
29562992
break;
2993+
caseT_NullTest:
2994+
retval=_copyNullTest(from);
2995+
break;
2996+
caseT_BooleanTest:
2997+
retval=_copyBooleanTest(from);
2998+
break;
29572999
caseT_FkConstraint:
29583000
retval=_copyFkConstraint(from);
29593001
break;

‎src/backend/nodes/equalfuncs.c‎

Lines changed: 27 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -20,7 +20,7 @@
2020
* Portions Copyright (c) 1994, Regents of the University of California
2121
*
2222
* IDENTIFICATION
23-
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.92 2001/06/09 23:21:54 petere Exp $
23+
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.93 2001/06/19 22:39:11 tgl Exp $
2424
*
2525
*-------------------------------------------------------------------------
2626
*/
@@ -1712,6 +1712,26 @@ _equalCaseWhen(CaseWhen *a, CaseWhen *b)
17121712
return true;
17131713
}
17141714

1715+
staticbool
1716+
_equalNullTest(NullTest*a,NullTest*b)
1717+
{
1718+
if (!equal(a->arg,b->arg))
1719+
return false;
1720+
if (a->nulltesttype!=b->nulltesttype)
1721+
return false;
1722+
return true;
1723+
}
1724+
1725+
staticbool
1726+
_equalBooleanTest(BooleanTest*a,BooleanTest*b)
1727+
{
1728+
if (!equal(a->arg,b->arg))
1729+
return false;
1730+
if (a->booltesttype!=b->booltesttype)
1731+
return false;
1732+
return true;
1733+
}
1734+
17151735
/*
17161736
* Stuff from pg_list.h
17171737
*/
@@ -2120,6 +2140,12 @@ equal(void *a, void *b)
21202140
caseT_CaseWhen:
21212141
retval=_equalCaseWhen(a,b);
21222142
break;
2143+
caseT_NullTest:
2144+
retval=_equalNullTest(a,b);
2145+
break;
2146+
caseT_BooleanTest:
2147+
retval=_equalBooleanTest(a,b);
2148+
break;
21232149
caseT_FkConstraint:
21242150
retval=_equalFkConstraint(a,b);
21252151
break;

‎src/backend/nodes/outfuncs.c‎

Lines changed: 33 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,7 @@
55
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
66
* Portions Copyright (c) 1994, Regents of the University of California
77
*
8-
*$Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.141 2001/05/20 20:28:18 tgl Exp $
8+
*$Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.142 2001/06/19 22:39:11 tgl Exp $
99
*
1010
* NOTES
1111
* Every (plan) node in POSTGRES has an associated "out" routine which
@@ -1259,12 +1259,6 @@ _outAExpr(StringInfo str, A_Expr *node)
12591259
caseNOT:
12601260
appendStringInfo(str,"NOT ");
12611261
break;
1262-
caseISNULL:
1263-
appendStringInfo(str,"ISNULL ");
1264-
break;
1265-
caseNOTNULL:
1266-
appendStringInfo(str,"NOTNULL ");
1267-
break;
12681262
caseOP:
12691263
_outToken(str,node->opname);
12701264
appendStringInfo(str," ");
@@ -1402,6 +1396,32 @@ _outCaseWhen(StringInfo str, CaseWhen *node)
14021396
_outNode(str,node->result);
14031397
}
14041398

1399+
/*
1400+
*NullTest
1401+
*/
1402+
staticvoid
1403+
_outNullTest(StringInfostr,NullTest*node)
1404+
{
1405+
appendStringInfo(str," NULLTEST :arg ");
1406+
_outNode(str,node->arg);
1407+
1408+
appendStringInfo(str," :nulltesttype %d ",
1409+
(int)node->nulltesttype);
1410+
}
1411+
1412+
/*
1413+
*BooleanTest
1414+
*/
1415+
staticvoid
1416+
_outBooleanTest(StringInfostr,BooleanTest*node)
1417+
{
1418+
appendStringInfo(str," BOOLEANTEST :arg ");
1419+
_outNode(str,node->arg);
1420+
1421+
appendStringInfo(str," :booltesttype %d ",
1422+
(int)node->booltesttype);
1423+
}
1424+
14051425
/*
14061426
* _outNode -
14071427
* converts a Node into ascii string and append it to 'str'
@@ -1639,7 +1659,12 @@ _outNode(StringInfo str, void *obj)
16391659
caseT_CaseWhen:
16401660
_outCaseWhen(str,obj);
16411661
break;
1642-
1662+
caseT_NullTest:
1663+
_outNullTest(str,obj);
1664+
break;
1665+
caseT_BooleanTest:
1666+
_outBooleanTest(str,obj);
1667+
break;
16431668
caseT_VariableSetStmt:
16441669
break;
16451670
caseT_SelectStmt:

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