1816       }else if( pMem->flags & MEM_Null ){  in sqlite3VdbeDisplayP4()
2590     initMemArray(p->aVar, nVar, db, MEM_Null);  in sqlite3VdbeMakeReady()
2720   initMemArray(p->aColName, n, db, MEM_Null);  in sqlite3VdbeSetNumCols()
3739   if( flags&MEM_Null ){
3933     pMem->flags = IsNaN(x) ? MEM_Null : MEM_Real;  in serialGet()
3944       pMem->flags = MEM_Null|MEM_Zero;  in sqlite3VdbeSerialGet()
3952       pMem->flags = MEM_Null;  in sqlite3VdbeSerialGet()
4184        && ((mem1.flags & MEM_Null) || (pPKey2->aMem[i].flags & MEM_Null))   in vdbeRecordCompareDebug()
4274     sqlite3VdbeMemInit(&c1, pMem1->db, MEM_Null);  in vdbeCompareMemString()
4275     sqlite3VdbeMemInit(&c2, pMem1->db, MEM_Null);  in vdbeCompareMemString()
4387   if( combined_flags&MEM_Null ){  in sqlite3MemCompare()
4388     return (f2&MEM_Null) - (f1&MEM_Null);  in sqlite3MemCompare()
4702            !=(serial_type==0 || (pRhs->flags&MEM_Null)))  in sqlite3VdbeRecordCompareWithSkip()
4952     testcase( flags & MEM_Null );  in sqlite3VdbeFindCompare()
4954     if( (flags & (MEM_Real|MEM_IntReal|MEM_Null|MEM_Blob))==0  in sqlite3VdbeFindCompare()
5155     if( 0==(pMem->flags & MEM_Null) ){  in sqlite3VdbeGetBoundValue()