diff options
Diffstat (limited to 'src/backend/executor/execQual.c')
| -rw-r--r-- | src/backend/executor/execQual.c | 138 |
1 files changed, 137 insertions, 1 deletions
diff --git a/src/backend/executor/execQual.c b/src/backend/executor/execQual.c index 84aa271629b..fb950fdfd14 100644 --- a/src/backend/executor/execQual.c +++ b/src/backend/executor/execQual.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.86 2001/04/19 04:29:02 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.87 2001/06/19 22:39:11 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -62,6 +62,10 @@ static Datum ExecEvalAnd(Expr *andExpr, ExprContext *econtext, bool *isNull); static Datum ExecEvalOr(Expr *orExpr, ExprContext *econtext, bool *isNull); static Datum ExecEvalCase(CaseExpr *caseExpr, ExprContext *econtext, bool *isNull, ExprDoneCond *isDone); +static Datum ExecEvalNullTest(NullTest *ntest, ExprContext *econtext, + bool *isNull, ExprDoneCond *isDone); +static Datum ExecEvalBooleanTest(BooleanTest *btest, ExprContext *econtext, + bool *isNull, ExprDoneCond *isDone); /*---------- @@ -1092,6 +1096,126 @@ ExecEvalCase(CaseExpr *caseExpr, ExprContext *econtext, } /* ---------------------------------------------------------------- + * ExecEvalNullTest + * + * Evaluate a NullTest node. + * ---------------------------------------------------------------- + */ +static Datum +ExecEvalNullTest(NullTest *ntest, + ExprContext *econtext, + bool *isNull, + ExprDoneCond *isDone) +{ + Datum result; + + result = ExecEvalExpr(ntest->arg, econtext, isNull, isDone); + switch (ntest->nulltesttype) + { + case IS_NULL: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(true); + } + else + return BoolGetDatum(false); + case IS_NOT_NULL: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(false); + } + else + return BoolGetDatum(true); + default: + elog(ERROR, "ExecEvalNullTest: unexpected nulltesttype %d", + (int) ntest->nulltesttype); + return (Datum) 0; /* keep compiler quiet */ + } +} + +/* ---------------------------------------------------------------- + * ExecEvalBooleanTest + * + * Evaluate a BooleanTest node. + * ---------------------------------------------------------------- + */ +static Datum +ExecEvalBooleanTest(BooleanTest *btest, + ExprContext *econtext, + bool *isNull, + ExprDoneCond *isDone) +{ + Datum result; + + result = ExecEvalExpr(btest->arg, econtext, isNull, isDone); + switch (btest->booltesttype) + { + case IS_TRUE: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(false); + } + else if (DatumGetBool(result)) + return BoolGetDatum(true); + else + return BoolGetDatum(false); + case IS_NOT_TRUE: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(true); + } + else if (DatumGetBool(result)) + return BoolGetDatum(false); + else + return BoolGetDatum(true); + case IS_FALSE: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(false); + } + else if (DatumGetBool(result)) + return BoolGetDatum(false); + else + return BoolGetDatum(true); + case IS_NOT_FALSE: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(true); + } + else if (DatumGetBool(result)) + return BoolGetDatum(true); + else + return BoolGetDatum(false); + case IS_UNKNOWN: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(true); + } + else + return BoolGetDatum(false); + case IS_NOT_UNKNOWN: + if (*isNull) + { + *isNull = false; + return BoolGetDatum(false); + } + else + return BoolGetDatum(true); + default: + elog(ERROR, "ExecEvalBooleanTest: unexpected booltesttype %d", + (int) btest->booltesttype); + return (Datum) 0; /* keep compiler quiet */ + } +} + +/* ---------------------------------------------------------------- * ExecEvalFieldSelect * * Evaluate a FieldSelect node. @@ -1266,6 +1390,18 @@ ExecEvalExpr(Node *expression, isNull, isDone); break; + case T_NullTest: + retDatum = ExecEvalNullTest((NullTest *) expression, + econtext, + isNull, + isDone); + break; + case T_BooleanTest: + retDatum = ExecEvalBooleanTest((BooleanTest *) expression, + econtext, + isNull, + isDone); + break; default: elog(ERROR, "ExecEvalExpr: unknown expression type %d", |