database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-08 14:02:16 +03:00
Code Activity

About a 3% improvement in the performance of OP_Column.

Browse Source 
FossilOrigin-Name: edff9d4a995095e555fcc9aec4c56f4bcaa1557e
This commit is contained in:
drh
2011-08-28 02:15:34 +00:00
parent 4a6f3aabca
commit e6f43fc4f8
3 changed files with 11 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/vdbe.c
View File

@@ -2129,7 +2129,6 @@ case OP_Column: {
assert( pOp->p3>0 && pOp->p3<=p->nMem );
pDest = &aMem[pOp->p3];
memAboutToChange(p, pDest);
MemSetTypeFlag(pDest, MEM_Null);
zRec = 0;
/* This block sets the variable payloadSize to be the total number of
@@ -2186,9 +2185,10 @@ case OP_Column: {
payloadSize = 0;
}
/* If payloadSize is 0, then just store a NULL */
/* If payloadSize is 0, then just store a NULL. This can happen because of
** nullRow or because of a corrupt database. */
if( payloadSize==0 ){
assert( pDest->flags&MEM_Null );
MemSetTypeFlag(pDest, MEM_Null);
goto op_column_out;
}
assert( db->aLimit[SQLITE_LIMIT_LENGTH]>=0 );
@@ -2354,7 +2354,7 @@ case OP_Column: {
if( pOp->p4type==P4_MEM ){
sqlite3VdbeMemShallowCopy(pDest, pOp->p4.pMem, MEM_Static);
}else{
assert( pDest->flags&MEM_Null );
MemSetTypeFlag(pDest, MEM_Null);
}
}