SQLite

   $(TOP)/ext/fts5/fts5_unicode2.c \
   $(TOP)/ext/fts5/fts5_varint.c \
   $(TOP)/ext/fts5/fts5_vocab.c  \

fts5parse.c:	$(TOP)/ext/fts5/fts5parse.y lemon 
	cp $(TOP)/ext/fts5/fts5parse.y .
	rm -f fts5parse.h
	./lemon$(BEXE) $(OPTS) fts5parse.y

fts5parse.h: fts5parse.c

fts5.c: $(FTS5_SRC)
	$(TCLSH_CMD) $(TOP)/ext/fts5/tool/mkfts5c.tcl
	cp $(TOP)/ext/fts5/fts5.h .

  sqlite3 *db,          /* The database connection (for malloc()) */
  Select *pSubq,        /* The subquery whose WHERE clause is to be augmented */
  Expr *pWhere,         /* The WHERE clause of the outer query */
  int iCursor           /* Cursor number of the subquery */
){
  Expr *pNew;
  int nChng = 0;
  Select *pX;           /* For looping over compound SELECTs in pSubq */
  if( pWhere==0 ) return 0;
  for(pX=pSubq; pX; pX=pX->pPrior){
    if( (pX->selFlags & (SF_Aggregate|SF_Recursive))!=0 ){
      testcase( pX->selFlags & SF_Aggregate );
      testcase( pX->selFlags & SF_Recursive );
      testcase( pX!=pSubq );
      return 0; /* restrictions (1) and (2) */
    }
  }
  if( pSubq->pLimit!=0 ){
    return 0; /* restriction (3) */
  }
  while( pWhere->op==TK_AND ){
    nChng += pushDownWhereTerms(db, pSubq, pWhere->pRight, iCursor);
    pWhere = pWhere->pLeft;
  }
  if( ExprHasProperty(pWhere,EP_FromJoin) ) return 0; /* restriction 5 */
  if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){

  SELECT t3.c FROM 
    (SELECT a,max(b) AS m FROM t1 WHERE a>=5 GROUP BY a) AS t2
    LEFT JOIN t1 AS t3
  WHERE t2.a=t3.a AND t2.m=t3.b
  ORDER BY t3.a;
} {95 96 97 98 99}

# Ticket https://www.sqlite.org/src/tktview/f7f8c97e975978d45  on 2016-04-25
#
# The where push-down optimization from 2015-06-02 is suppose to disable
# on aggregate subqueries.  But if the subquery is a compound where the
# last SELECT is non-aggregate but some other SELECT is an aggregate, the
# test is incomplete and the optimization is not properly disabled.
# 
# The following test cases verify that the fix works.
#
do_execsql_test select4-17.1 {
  DROP TABLE IF EXISTS t1;
  CREATE TABLE t1(a int, b int);
  INSERT INTO t1 VALUES(1,2),(1,18),(2,19);
  SELECT x, y FROM (
    SELECT 98 AS x, 99 AS y
    UNION
    SELECT a AS x, sum(b) AS y FROM t1 GROUP BY a
  ) AS w WHERE y>=20
  ORDER BY +x;
} {1 20 98 99}
do_execsql_test select4-17.2 {
  SELECT x, y FROM (
    SELECT a AS x, sum(b) AS y FROM t1 GROUP BY a
    UNION
    SELECT 98 AS x, 99 AS y
  ) AS w WHERE y>=20
  ORDER BY +x;
} {1 20 98 99}
do_catchsql_test select4-17.3 {
  SELECT x, y FROM (
    SELECT a AS x, sum(b) AS y FROM t1 GROUP BY a LIMIT 3
    UNION
    SELECT 98 AS x, 99 AS y
  ) AS w WHERE y>=20
  ORDER BY +x;
} {1 {LIMIT clause should come after UNION not before}}



finish_test