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Add a new opcode to the VDBE that gives the b-tree a hint about the set

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of columns in a table or index that are actually used by the query.

FossilOrigin-Name: f167bba446b78dd7538d0b2bae3e6678f3b1ba28
This commit is contained in:
drh
2015-06-05 15:59:57 +00:00
parent d62fbb50e6
commit 97bae794c2
8 changed files with 77 additions and 29 deletions
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19
src/expr.c
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@@ -2208,17 +2208,6 @@ static void sqlite3ExprCodeIN(
}
#endif /* SQLITE_OMIT_SUBQUERY */
/*
** Duplicate an 8-byte value
*/
static char *dup8bytes(Vdbe *v, const char *in){
char *out = sqlite3DbMallocRaw(sqlite3VdbeDb(v), 8);
if( out ){
memcpy(out, in, 8);
}
return out;
}
#ifndef SQLITE_OMIT_FLOATING_POINT
/*
** Generate an instruction that will put the floating point
@@ -2231,12 +2220,10 @@ static char *dup8bytes(Vdbe *v, const char *in){
static void codeReal(Vdbe *v, const char *z, int negateFlag, int iMem){
if( ALWAYS(z!=0) ){
double value;
char *zV;
sqlite3AtoF(z, &value, sqlite3Strlen30(z), SQLITE_UTF8);
assert( !sqlite3IsNaN(value) ); /* The new AtoF never returns NaN */
if( negateFlag ) value = -value;
zV = dup8bytes(v, (char*)&value);
sqlite3VdbeAddOp4(v, OP_Real, 0, iMem, 0, zV, P4_REAL);
sqlite3VdbeAddOp4Dup8(v, OP_Real, 0, iMem, 0, (u8*)&value, P4_REAL);
}
}
#endif
@@ -2262,10 +2249,8 @@ static void codeInteger(Parse *pParse, Expr *pExpr, int negFlag, int iMem){
assert( z!=0 );
c = sqlite3DecOrHexToI64(z, &value);
if( c==0 || (c==2 && negFlag) ){
char *zV;
if( negFlag ){ value = c==2 ? SMALLEST_INT64 : -value; }
zV = dup8bytes(v, (char*)&value);
sqlite3VdbeAddOp4(v, OP_Int64, 0, iMem, 0, zV, P4_INT64);
sqlite3VdbeAddOp4Dup8(v, OP_Int64, 0, iMem, 0, (u8*)&value, P4_INT64);
}else{
#ifdef SQLITE_OMIT_FLOATING_POINT
sqlite3ErrorMsg(pParse, "oversized integer: %s%s", negFlag ? "-" : "", z);