SQLite

            pNC2 = pNC2->pNext;
          }
          assert( pDef!=0 || IN_RENAME_OBJECT );
          if( pNC2 && pDef ){
            assert( SQLITE_FUNC_MINMAX==NC_MinMaxAgg );
            testcase( (pDef->funcFlags & SQLITE_FUNC_MINMAX)!=0 );
            pNC2->ncFlags |= NC_HasAgg | (pDef->funcFlags & SQLITE_FUNC_MINMAX);

          }
        }
        pNC->ncFlags |= savedAllowFlags;
      }
      /* FIX ME:  Compute pExpr->affinity based on the expected return
      ** type of the function 
      */

      sqlite3WindowCodeInit(pParse, p);
    }
#endif
    assert( WHERE_USE_LIMIT==SF_FixedLimit );


    /* Begin the database scan. */
    SELECTTRACE(1,pParse,p,("WhereBegin-A\n"));
    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, sSort.pOrderBy,
                               p->pEList, wctrlFlags, p->nSelectRow);
    if( pWInfo==0 ) goto select_end;
    if( sqlite3WhereOutputRowCount(pWInfo) < p->nSelectRow ){
      p->nSelectRow = sqlite3WhereOutputRowCount(pWInfo);
    }
    if( sDistinct.isTnct && sqlite3WhereIsDistinct(pWInfo) ){

      /* Begin a loop that will extract all source rows in GROUP BY order.
      ** This might involve two separate loops with an OP_Sort in between, or
      ** it might be a single loop that uses an index to extract information
      ** in the right order to begin with.
      */
      sqlite3VdbeAddOp2(v, OP_Gosub, regReset, addrReset);
      SELECTTRACE(1,pParse,p,("WhereBegin-B\n"));
      pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, pGroupBy, 0,
          WHERE_GROUPBY | (orderByGrp ? WHERE_SORTBYGROUP : 0), 0
      );
      if( pWInfo==0 ) goto select_end;
      if( sqlite3WhereIsOrdered(pWInfo)==pGroupBy->nExpr ){
        /* The optimizer is able to deliver rows in group by order so
        ** we do not have to sort.  The OP_OpenEphemeral table will be

        ** minMaxFlag will have been previously set to either
        ** WHERE_ORDERBY_MIN or WHERE_ORDERBY_MAX and pMinMaxOrderBy will
        ** be an appropriate ORDER BY expression for the optimization.
        */
        assert( minMaxFlag==WHERE_ORDERBY_NORMAL || pMinMaxOrderBy!=0 );
        assert( pMinMaxOrderBy==0 || pMinMaxOrderBy->nExpr==1 );

        SELECTTRACE(1,pParse,p,("WhereBegin-C\n"));
        pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, pMinMaxOrderBy,
                                   0, minMaxFlag, 0);
        if( pWInfo==0 ){
          goto select_end;
        }
        updateAccumulator(pParse, regAcc, &sAggInfo);
        if( regAcc ) sqlite3VdbeAddOp2(v, OP_Integer, 1, regAcc);

/*
** When rewriting a query, if the new subquery in the FROM clause
** contains TK_AGG_FUNCTION nodes that refer to an outer query,
** then we have to increase the Expr->op2 values of those nodes
** due to the extra subquery layer that was added.
**
** See also the incrAggDepth() routine in resolve.c
**
** In addition to increasing pExpr->op2, set pWalker->eCode to 1 if
** any top-level aggregate functions are encountered.  This is needed
** to accurately set the SF_Aggregate flag on the new window-function
** subquery.
*/
static int sqlite3WindowExtraAggFuncDepth(Walker *pWalker, Expr *pExpr){
  if( pExpr->op==TK_AGG_FUNCTION ){
    if( pExpr->op2>=pWalker->walkerDepth ){

      pExpr->op2++;
    }else if( pExpr->op2==pWalker->walkerDepth-1 ){
      pWalker->eCode = 1;
    }
  }
  return WRC_Continue;
}

/*
** If the SELECT statement passed as the second argument does not invoke
** any SQL window functions, this function is a no-op. Otherwise, it 

    Expr *pHaving = p->pHaving;
    ExprList *pSort = 0;

    ExprList *pSublist = 0;       /* Expression list for sub-query */
    Window *pMWin = p->pWin;      /* Master window object */
    Window *pWin;                 /* Window object iterator */
    Table *pTab;


    pTab = sqlite3DbMallocZero(db, sizeof(Table));
    if( pTab==0 ){
      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
    }

    p->pSrc = 0;

    if( p->pSrc ){
      Table *pTab2;
      Walker w;
      p->pSrc->a[0].pSelect = pSub;
      sqlite3SrcListAssignCursors(pParse, p->pSrc);
      pSub->selFlags |= SF_Expanded;
      pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);

      if( pTab2==0 ){
        /* Might actually be some other kind of error, but in that case
        ** pParse->nErr will be set, so if SQLITE_NOMEM is set, we will get
        ** the correct error message regardless. */
        rc = SQLITE_NOMEM;
      }else{
        memcpy(pTab, pTab2, sizeof(Table));
        pTab->tabFlags |= TF_Ephemeral;
        assert( pTab->zName==0 );
        pTab->zName = sqlite3MPrintf(db, "$wintab_%p", pTab);
        p->pSrc->a[0].pTab = pTab;
        pTab = pTab2;
        memset(&w, 0, sizeof(w));
        w.xExprCallback = sqlite3WindowExtraAggFuncDepth;
        w.xSelectCallback = sqlite3WalkerDepthIncrease;
        w.xSelectCallback2 = sqlite3WalkerDepthDecrease;
        sqlite3WalkSelect(&w, pSub);
        if( w.eCode ) pSub->selFlags |= SF_Aggregate;
      }
    }else{
      sqlite3SelectDelete(db, pSub);
    }
    if( db->mallocFailed ) rc = SQLITE_NOMEM;
    sqlite3DbFree(db, pTab);
  }

      SELECT c AS x FROM t4
      UNION
      SELECT d FROM t4
      ORDER BY (SELECT e FROM t4)
    )
  );
} {1 {1st ORDER BY term does not match any column in the result set}}

# 2020-06-06 various dbsqlfuzz finds and
# ticket 0899cf62f597d7e7
#
reset_db
do_execsql_test 57.1 {
  CREATE TABLE t1(a, b, c);
  INSERT INTO t1 VALUES(NULL,NULL,NULL);
  SELECT 
    sum(a),
    min(b) OVER (),
    count(c) OVER (ORDER BY b)
  FROM t1;
} {{} {} 0}
do_execsql_test 57.2 {
  CREATE TABLE v0 ( v1 INTEGER PRIMARY KEY ) ; 
  INSERT INTO v0 VALUES ( 10 ) ; 
  SELECT DISTINCT v1, lead(v1) OVER() FROM v0 GROUP BY v1 ORDER BY 2;
} {10 {}}

finish_test