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The LIKE optimization must be applied twice, once for strings and a second

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time for BLOBs.  Ticket [05f43be8fdda9f].  This check-in is a proof-of-concept
of how that might be done.

FossilOrigin-Name: 5757e803cb5759b476bbc6453c58340089611420
This commit is contained in:
drh
2015-03-06 16:45:16 +00:00
parent 8dd7a6a925
commit f07cf6e2a5
5 changed files with 73 additions and 18 deletions
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16
src/vdbe.c
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@@ -1015,7 +1015,7 @@ case OP_Real: { /* same as TK_FLOAT, out2-prerelease */
** Synopsis: r[P2]='P4'
**
** P4 points to a nul terminated UTF-8 string. This opcode is transformed
** into a String before it is executed for the first time. During
** into a String opcode before it is executed for the first time. During
** this transformation, the length of string P4 is computed and stored
** as the P1 parameter.
*/
@@ -1047,10 +1047,15 @@ case OP_String8: { /* same as TK_STRING, out2-prerelease */
/* Fall through to the next case, OP_String */
}
/* Opcode: String P1 P2 * P4 *
/* Opcode: String P1 P2 P3 P4 P5
** Synopsis: r[P2]='P4' (len=P1)
**
** The string value P4 of length P1 (bytes) is stored in register P2.
**
** If P5!=0 and the content of register P3 is greater than zero, then
** the datatype of the register P2 is convert to BLOB. The content is
** the same string text, it is merely interpreted as a BLOB as if it
** had been CAST.
*/
case OP_String: { /* out2-prerelease */
assert( pOp->p4.z!=0 );
@@ -1059,6 +1064,13 @@ case OP_String: { /* out2-prerelease */
pOut->n = pOp->p1;
pOut->enc = encoding;
UPDATE_MAX_BLOBSIZE(pOut);
if( pOp->p5 ){
assert( pOp->p3>0 );
assert( pOp->p3<=(p->nMem-p->nCursor) );
pIn3 = &aMem[pOp->p3];
assert( pIn3->flags & MEM_Int );
if( pIn3->u.i ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
}
break;
}