diff options
Diffstat (limited to 'test/select4.test')
| -rw-r--r-- | test/select4.test | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/test/select4.test b/test/select4.test index be8d0e0ab..1f29f2907 100644 --- a/test/select4.test +++ b/test/select4.test @@ -12,7 +12,6 @@ # focus of this file is testing UNION, INTERSECT and EXCEPT operators # in SELECT statements. # -# $Id: select4.test,v 1.30 2009/04/16 00:24:24 drh Exp $ set testdir [file dirname $argv0] source $testdir/tester.tcl @@ -936,4 +935,40 @@ do_execsql_test select4-15.1 { ORDER BY 1; } {1 33 456 2 33 789} +# Enhancement (2016-03-15): Use a co-routine for subqueries if the +# subquery is guaranteed to be the outer-most query +# +do_execsql_test select4-16.1 { + DROP TABLE IF EXISTS t1; + CREATE TABLE t1(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z, + PRIMARY KEY(a,b DESC)) WITHOUT ROWID; + + WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100) + INSERT INTO t1(a,b,c,d) + SELECT x%10, x/10, x, printf('xyz%dabc',x) FROM c; + + SELECT t3.c FROM + (SELECT a,max(b) AS m FROM t1 WHERE a>=5 GROUP BY a) AS t2 + JOIN t1 AS t3 + WHERE t2.a=t3.a AND t2.m=t3.b + ORDER BY t3.a; +} {95 96 97 98 99} +do_execsql_test select4-16.2 { + SELECT t3.c FROM + (SELECT a,max(b) AS m FROM t1 WHERE a>=5 GROUP BY a) AS t2 + CROSS JOIN t1 AS t3 + WHERE t2.a=t3.a AND t2.m=t3.b + ORDER BY t3.a; +} {95 96 97 98 99} +do_execsql_test select4-16.3 { + 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} + + + + finish_test |