if( sqlite3CompareAffinity(p, zAff[i])==SQLITE_AFF_BLOB
     || sqlite3ExprNeedsNoAffinityChange(p, zAff[i])
    ){
      zAff[i] = SQLITE_AFF_BLOB;
    }
  }
}






















/*
** Generate code for a single equality term of the WHERE clause.  An equality
** term can be either X=expr or X IN (...).   pTerm is the term to be 
** coded.
**
** The current value for the constraint is left in a register, the index
................................................................................
          Expr *pNewRhs = sqlite3ExprDup(db, pOrigRhs->a[iField].pExpr, 0);
          Expr *pNewLhs = sqlite3ExprDup(db, pOrigLhs->a[iField].pExpr, 0);

          pRhs = sqlite3ExprListAppend(pParse, pRhs, pNewRhs);
          pLhs = sqlite3ExprListAppend(pParse, pLhs, pNewLhs);
        }
      }








      if( !db->mallocFailed ){
        Expr *pLeft = pX->pLeft;

        if( pSelect->pOrderBy ){
          /* If the SELECT statement has an ORDER BY clause, zero the 
          ** iOrderByCol variables. These are set to non-zero when an 
          ** ORDER BY term exactly matches one of the terms of the 

    if( sqlite3CompareAffinity(p, zAff[i])==SQLITE_AFF_BLOB
     || sqlite3ExprNeedsNoAffinityChange(p, zAff[i])
    ){
      zAff[i] = SQLITE_AFF_BLOB;
    }
  }
}

#ifdef SQLITE_DEBUG
/* Return true if the pSub ExprList is a subset of pMain.  The terms
** of pSub can be in a different order from pMain.  The only requirement
** is that every term in pSub must exist somewhere in pMain.
**
** Return false if pSub contains any term that is not found in pMain.
*/
static int exprListSubset(ExprList *pSub, ExprList *pMain){
  int i, j;
  for(i=0; i<pSub->nExpr; i++){
    Expr *p = pSub->a[i].pExpr;
    for(j=0; j<pMain->nExpr; j++){
      if( sqlite3ExprCompare(0, p, pMain->a[j].pExpr, 0)==0 ) break;
    }
    if( j>=pMain->nExpr ) return 0;
  }
  return 1;
}
#endif /* SQLITE_DEBUG */


/*
** Generate code for a single equality term of the WHERE clause.  An equality
** term can be either X=expr or X IN (...).   pTerm is the term to be 
** coded.
**
** The current value for the constraint is left in a register, the index
................................................................................
          Expr *pNewRhs = sqlite3ExprDup(db, pOrigRhs->a[iField].pExpr, 0);
          Expr *pNewLhs = sqlite3ExprDup(db, pOrigLhs->a[iField].pExpr, 0);

          pRhs = sqlite3ExprListAppend(pParse, pRhs, pNewRhs);
          pLhs = sqlite3ExprListAppend(pParse, pLhs, pNewLhs);
        }
      }
 
      /* pRhs should be a subset of pOrigRhs (though possibly in a different
      ** order).  And pLhs should be a subset of pOrigLhs.  To put it 
      ** another way:  Every term of pRhs should exist in pOrigRhs and
      ** every term of pLhs should exist in pOrigLhs. */
      assert( db->mallocFailed || exprListSubset(pRhs, pOrigRhs) );
      assert( db->mallocFailed || exprListSubset(pLhs, pOrigLhs) );

      if( !db->mallocFailed ){
        Expr *pLeft = pX->pLeft;

        if( pSelect->pOrderBy ){
          /* If the SELECT statement has an ORDER BY clause, zero the 
          ** iOrderByCol variables. These are set to non-zero when an 
          ** ORDER BY term exactly matches one of the terms of the