SQLite

  char const *zOrigDb = 0;
  char const *zOrigTab = 0;
  char const *zOrigCol = 0;
#endif

  assert( pExpr!=0 );
  assert( pNC->pSrcList!=0 );


  switch( pExpr->op ){
    case TK_COLUMN: {
      /* The expression is a column. Locate the table the column is being
      ** extracted from in NameContext.pSrcList. This table may be real
      ** database table or a subquery.
      */
      Table *pTab = 0;            /* Table structure column is extracted from */

      /* If the column contains an "AS <name>" phrase, use <name> as the name */
    }else{
      Expr *pColExpr = sqlite3ExprSkipCollate(pEList->a[i].pExpr);
      while( pColExpr->op==TK_DOT ){
        pColExpr = pColExpr->pRight;
        assert( pColExpr!=0 );
      }

      if( pColExpr->op==TK_COLUMN ){
        /* For columns use the column name name */
        int iCol = pColExpr->iColumn;
        Table *pTab = pColExpr->y.pTab;
        assert( pTab!=0 );
        if( iCol<0 ) iCol = pTab->iPKey;
        zName = iCol>=0 ? pTab->aCol[iCol].zName : "rowid";

        pLimit = p->pLimit;
        p->pLimit = 0;
        uniondest.eDest = op;
        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
                          selectOpName(p->op)));
        rc = sqlite3Select(pParse, p, &uniondest);
        testcase( rc!=SQLITE_OK );


        assert( p->pOrderBy==0 );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        p->pOrderBy = 0;
        if( p->op==TK_UNION ){
          p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
        }
        sqlite3ExprDelete(db, p->pLimit);

    **   SELECT a+5, b*10 FROM (SELECT x*3 AS a, y+10 AS b FROM t1) WHERE a>b;
    **   \                     \_____________ subquery __________/          /
    **    \_____________________ outer query ______________________________/
    **
    ** We look at every expression in the outer query and every place we see
    ** "a" we substitute "x*3" and every place we see "b" we substitute "y+10".
    */
    if( pSub->pOrderBy && (pParent->selFlags & SF_NoopOrderBy)==0 ){
      /* At this point, any non-zero iOrderByCol values indicate that the
      ** ORDER BY column expression is identical to the iOrderByCol'th
      ** expression returned by SELECT statement pSub. Since these values
      ** do not necessarily correspond to columns in SELECT statement pParent,
      ** zero them before transfering the ORDER BY clause.
      **
      ** Not doing this may cause an error if a subsequent call to this

           pDest->eDest==SRT_Queue  || pDest->eDest==SRT_DistFifo ||
           pDest->eDest==SRT_DistQueue || pDest->eDest==SRT_Fifo);
    /* If ORDER BY makes no difference in the output then neither does
    ** DISTINCT so it can be removed too. */
    sqlite3ExprListDelete(db, p->pOrderBy);
    p->pOrderBy = 0;
    p->selFlags &= ~SF_Distinct;
    p->selFlags |= SF_NoopOrderBy;
  }
  sqlite3SelectPrep(pParse, p, 0);
  if( pParse->nErr || db->mallocFailed ){
    goto select_end;
  }
  assert( p->pEList!=0 );
#if SELECTTRACE_ENABLED

#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */
#define SF_MaybeConvert   0x08000  /* Need convertCompoundSelectToSubquery() */
#define SF_Converted      0x10000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x20000  /* Include hidden columns in output */
#define SF_ComplexResult  0x40000  /* Result contains subquery or function */
#define SF_NoopOrderBy   0x0400000 /* ORDER BY is ignored for this query */

/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index

} {Bbb 123}
ifcapable vtab {
  do_execsql_test colname-9.320 {
    CREATE TABLE t2 AS SELECT BBb FROM (SELECT aaa AS Bbb FROM t1);
    SELECT name FROM pragma_table_info('t2');
  } {Bbb}
}
do_execsql_test colname-9.330 { -- added 2019-08-10 to invalidate
  DROP TABLE IF EXISTS t1;      -- a couple assert()s that were
  CREATE TABLE t1(a);           -- added by ticket 3b44500725
  INSERT INTO t1 VALUES(17),(2),(99),(-3),(7);
  SELECT (SELECT avg(a) UNION SELECT min(a) OVER()) FROM t1;
} {17}

# Issue detected by OSSFuzz on 2017-12-24 (Christmas Eve)
# caused by check-in https://sqlite.org/src/info/6b2ff26c25
#
# Prior to being fixed, the following CREATE TABLE was dereferencing
# a NULL pointer and segfaulting.
#

  DROP TABLE IF EXISTS t2;
  CREATE TABLE t1(a INTEGER);
  CREATE TABLE t2(b TEXT);
  INSERT INTO t2(b) VALUES('12345');
  SELECT * FROM (SELECT a FROM t1 UNION SELECT b FROM t2) WHERE a=a;
} {12345}

# 2020-06-15 ticket 8f157e8010b22af0
#
reset_db
do_execsql_test 7.1 {
  CREATE TABLE t1(c1);     INSERT INTO t1 VALUES(12),(123),(1234),(NULL),('abc');
  CREATE TABLE t2(c2);     INSERT INTO t2 VALUES(44),(55),(123);
  CREATE TABLE t3(c3,c4);  INSERT INTO t3 VALUES(66,1),(123,2),(77,3);
  CREATE VIEW t4 AS SELECT c3 FROM t3;
  CREATE VIEW t5 AS SELECT c3 FROM t3 ORDER BY c4;
}
do_execsql_test 7.2 {
  SELECT * FROM t1, t2 WHERE c1=(SELECT 123 INTERSECT SELECT c2 FROM t4) AND c1=123;
} {123 123}
do_execsql_test 7.3 {
  SELECT * FROM t1, t2 WHERE c1=(SELECT 123 INTERSECT SELECT c2 FROM t5) AND c1=123;
} {123 123}
do_execsql_test 7.4 {
  CREATE TABLE a(b);
  CREATE VIEW c(d) AS SELECT b FROM a ORDER BY b;
  SELECT sum(d) OVER( PARTITION BY(SELECT 0 FROM c JOIN a WHERE b =(SELECT b INTERSECT SELECT d FROM c) AND b = 123)) FROM c;
} {}

finish_test

  13 M cc NULL JM | 
  3 C cc 1 {} | 
  4 D cc 8.25 {} | 
  12 L cc 'xyZ' L | 
  11 K cc 'xyz' K |
}


#-------------------------------------------------------------------------
# Test that the SQL in ticket [c8d3b9f0a75] - CVE-2020-13871 - does not
# cause a problem for this version.
#
reset_db
do_execsql_test 30.0 {
  CREATE TABLE a(b);
}

do_execsql_test 30.1 {
  SELECT(SELECT b FROM a GROUP BY b HAVING(NULL AND b IN((SELECT COUNT() OVER(ORDER BY b) = lead(b) OVER(ORDER BY 3.100000 * SUM(DISTINCT CASE WHEN b LIKE 'SM PACK' THEN b * b ELSE 0 END) / b))))) FROM a EXCEPT SELECT b FROM a ORDER BY b, b, b;
}


finish_test