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Fix handling of NULL constraint conditions: per SQL92 spec, a NULL result

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from a constraint condition does not violate the constraint (cf. discussion
on pghackers 12/9/99).  Implemented by adding a parameter to ExecQual,
specifying whether to return TRUE or FALSE when the qual result is
really NULL in three-valued boolean logic.  Currently, ExecRelCheck is
the only caller that asks for TRUE, but if we find any other places that
have the wrong response to NULL, it'll be easy to fix them.
This commit is contained in:
Tom Lane
2000-01-19 23:55:03 +00:00
parent 08fb7375e3
commit 6d1efd76fb
20 changed files with 143 additions and 104 deletions
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17
src/include/executor/executor.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: executor.h,v 1.40 1999/12/10 03:56:08 momjian Exp $
* $Id: executor.h,v 1.41 2000/01/19 23:55:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,17 +24,7 @@
*/
/* return: true if tuple in slot is NULL, slot is slot to test */
#define TupIsNull(slot) \
( \
((slot) == NULL) ? \
true \
: \
( \
((slot)->val == NULL) ? \
true \
: \
false \
) \
)
((slot) == NULL || (slot)->val == NULL)
/*
* prototypes from functions in execAmi.c
@@ -88,13 +78,12 @@ extern Datum ExecExtractResult(TupleTableSlot *slot, AttrNumber attnum,
extern Datum ExecEvalParam(Param *expression, ExprContext *econtext,
bool *isNull);
/* stop here */
extern char *GetAttributeByNum(TupleTableSlot *slot, AttrNumber attrno,
bool *isNull);
extern char *GetAttributeByName(TupleTableSlot *slot, char *attname, bool *isNull);
extern Datum ExecEvalExpr(Node *expression, ExprContext *econtext, bool *isNull,
bool *isDone);
extern bool ExecQual(List *qual, ExprContext *econtext);
extern bool ExecQual(List *qual, ExprContext *econtext, bool resultForNull);
extern int ExecTargetListLength(List *targetlist);
extern TupleTableSlot *ExecProject(ProjectionInfo *projInfo, bool *isDone);