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Consolidate more of the DISTINCT processing logic into a single spot in the

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code.  Reduce the number of OP_Column operations needed to perform a
WHERE_DISTINCT_ORDERED.

FossilOrigin-Name: 79e922f7ae29bbe06d639d648fbd72523cf9a28e
This commit is contained in:
drh
2012-09-21 00:04:28 +00:00
parent 634d81dee0
commit e8e4af7697
7 changed files with 128 additions and 113 deletions
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28
src/vdbe.c
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@@ -1020,10 +1020,10 @@ case OP_Variable: { /* out2-prerelease */
/* Opcode: Move P1 P2 P3 * *
**
** Move the values in register P1..P1+P3-1 over into
** registers P2..P2+P3-1. Registers P1..P1+P1-1 are
** Move the values in register P1..P1+P3 over into
** registers P2..P2+P3. Registers P1..P1+P3 are
** left holding a NULL. It is an error for register ranges
** P1..P1+P3-1 and P2..P2+P3-1 to overlap.
** P1..P1+P3 and P2..P2+P3 to overlap.
*/
case OP_Move: {
char *zMalloc; /* Holding variable for allocated memory */
@@ -1031,7 +1031,7 @@ case OP_Move: {
int p1; /* Register to copy from */
int p2; /* Register to copy to */
n = pOp->p3;
n = pOp->p3 + 1;
p1 = pOp->p1;
p2 = pOp->p2;
assert( n>0 && p1>0 && p2>0 );
@@ -1060,20 +1060,28 @@ case OP_Move: {
break;
}
/* Opcode: Copy P1 P2 * * *
/* Opcode: Copy P1 P2 P3 * *
**
** Make a copy of register P1 into register P2.
** Make a copy of registers P1..P1+P3 into registers P2..P2+P3.
**
** This instruction makes a deep copy of the value. A duplicate
** is made of any string or blob constant. See also OP_SCopy.
*/
case OP_Copy: { /* in1, out2 */
case OP_Copy: {
int n;
n = pOp->p3;
pIn1 = &aMem[pOp->p1];
pOut = &aMem[pOp->p2];
assert( pOut!=pIn1 );
sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem);
Deephemeralize(pOut);
REGISTER_TRACE(pOp->p2, pOut);
while( 1 ){
sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem);
Deephemeralize(pOut);
REGISTER_TRACE(pOp->p2+pOp->p3-n, pOut);
if( (n--)==0 ) break;
pOut++;
pIn1++;
}
break;
}