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Constant propagation is now restricted to just the WHERE clause. The

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mechanism is changed to take affinity and collation into account.  This
seems to give correct answers.  But the search for constant propagation
costs 4 million cycles in the speed test.

FossilOrigin-Name: 82c67efb723dba387964f690cd459b420e59e3367d9589016597a76531596391
This commit is contained in:
drh
2018-07-27 16:57:11 +00:00
parent 7de7602eb7
commit efad2e2366
8 changed files with 94 additions and 41 deletions
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3
src/sqliteInt.h
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@@ -2479,7 +2479,7 @@ struct Expr {
#define EP_FromJoin 0x000001 /* Originates in ON/USING clause of outer join */
#define EP_Agg 0x000002 /* Contains one or more aggregate functions */
#define EP_HasFunc 0x000004 /* Contains one or more functions of any kind */
/* 0x000008 // available for use */
#define EP_FixedCol 0x000008 /* TK_Column with a known fixed value */
#define EP_Distinct 0x000010 /* Aggregate function with DISTINCT keyword */
#define EP_VarSelect 0x000020 /* pSelect is correlated, not constant */
#define EP_DblQuoted 0x000040 /* token.z was originally in "..." */
@@ -4171,6 +4171,7 @@ int sqlite3MemdbInit(void);
const char *sqlite3ErrStr(int);
int sqlite3ReadSchema(Parse *pParse);
CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
int sqlite3IsBinary(const CollSeq*);
CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);
CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);
CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, Expr *pExpr);