diff options
Diffstat (limited to 'src/include/nodes/parsenodes.h')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 51 |
1 files changed, 47 insertions, 4 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index fe2d1bb7ffe..43e64b6ad5f 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: parsenodes.h,v 1.131 2001/06/09 23:21:55 petere Exp $ + * $Id: parsenodes.h,v 1.132 2001/06/19 22:39:12 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -983,9 +983,8 @@ typedef struct ParamNo typedef struct A_Expr { NodeTag type; - int oper; /* type of operation - * {OP,OR,AND,NOT,ISNULL,NOTNULL} */ - char *opname; /* name of operator/function */ + int oper; /* type of operation (OP,OR,AND,NOT) */ + char *opname; /* name of operator */ Node *lexpr; /* left argument */ Node *rexpr; /* right argument */ } A_Expr; @@ -1054,6 +1053,50 @@ typedef struct CaseWhen Node *result; /* substitution result */ } CaseWhen; +/* ---------------- + * NullTest + * + * NullTest represents the operation of testing a value for NULLness. + * Currently, we only support scalar input values, but eventually a + * row-constructor input should be supported. + * The appropriate test is performed and returned as a boolean Datum. + * ---------------- + */ + +typedef enum NullTestType +{ + IS_NULL, IS_NOT_NULL +} NullTestType; + +typedef struct NullTest +{ + NodeTag type; + Node *arg; /* input expression */ + NullTestType nulltesttype; /* IS NULL, IS NOT NULL */ +} NullTest; + +/* ---------------- + * BooleanTest + * + * BooleanTest represents the operation of determining whether a boolean + * is TRUE, FALSE, or UNKNOWN (ie, NULL). All six meaningful combinations + * are supported. Note that a NULL input does *not* cause a NULL result. + * The appropriate test is performed and returned as a boolean Datum. + * ---------------- + */ + +typedef enum BoolTestType +{ + IS_TRUE, IS_NOT_TRUE, IS_FALSE, IS_NOT_FALSE, IS_UNKNOWN, IS_NOT_UNKNOWN +} BoolTestType; + +typedef struct BooleanTest +{ + NodeTag type; + Node *arg; /* input expression */ + BoolTestType booltesttype; /* test type */ +} BooleanTest; + /* * ColumnDef - column definition (used in various creates) * |