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Use macros to determine if an expression is always true or always false.

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FossilOrigin-Name: 6de980a09c3a7adf71f2c9a63a242673b5e1f246e8ee071b26844275f0dad0fc
This commit is contained in:
drh
2019-04-19 16:21:51 +00:00
parent d5c851c1cb
commit ad31727fc6
4 changed files with 19 additions and 41 deletions
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4
src/sqliteInt.h
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@@ -2530,6 +2530,8 @@ struct Expr {
#define EP_Subrtn 0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
#define EP_Quoted 0x4000000 /* TK_ID was originally quoted */
#define EP_Static 0x8000000 /* Held in memory not obtained from malloc() */
#define EP_IsTrue 0x10000000 /* Always has boolean value of TRUE */
#define EP_IsFalse 0x20000000 /* Always has boolean value of FALSE */
/*
** The EP_Propagate mask is a set of properties that automatically propagate
@@ -2545,6 +2547,8 @@ struct Expr {
#define ExprHasAllProperty(E,P) (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P) (E)->flags|=(P)
#define ExprClearProperty(E,P) (E)->flags&=~(P)
#define ExprAlwaysTrue(E) (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
#define ExprAlwaysFalse(E) (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)
/* The ExprSetVVAProperty() macro is used for Verification, Validation,
** and Accreditation only. It works like ExprSetProperty() during VVA