Reduce runtimes for some qp_* tests.

Before:
     qp_functions             ... ok (76.24 sec)  (diff:0.06 sec)
     qp_gist_indexes4         ... ok (88.46 sec)  (diff:0.07 sec)
     qp_with_clause           ... ok (130.70 sec)  (diff:0.32 sec)

After:
     qp_functions             ... ok (4.49 sec)  (diff:0.06 sec)
     qp_gist_indexes4         ... ok (16.18 sec)  (diff:0.06 sec)
     qp_with_clause           ... ok (54.41 sec)  (diff:0.30 sec)

src/test/regress/expected/qp_functions.out

@@ -1065,17 +1065,19 @@ drop type sum_prod cascade;
 NOTICE:  drop cascades to function num_add_prod(integer,integer)
 drop table bank_ac;
 drop table emp_fun cascade;
-NOTICE:  drop cascades to function get_emp_name(emp_fun)
-NOTICE:  drop cascades to function new_emp_fun()
-NOTICE:  drop cascades to function increment(emp_fun)
+NOTICE:  drop cascades to 3 other objects
+DETAIL:  drop cascades to function increment(emp_fun)
+drop cascades to function new_emp_fun()
+drop cascades to function get_emp_name(emp_fun)
 drop table tab_sour cascade;
-NOTICE:  drop cascades to function set_tab2()
-NOTICE:  drop cascades to function set_tab(integer)
-NOTICE:  drop cascades to function get_tab(integer)
+NOTICE:  drop cascades to 3 other objects
+DETAIL:  drop cascades to function get_tab(integer)
+drop cascades to function set_tab(integer)
+drop cascades to function set_tab2()
 drop table fun_tree;
 drop table logtable;
 drop table db;
-create table stress_source as select a from generate_series(1,12000) a;
+create table stress_source as select a from generate_series(1,100) a;
 NOTICE:  Table doesn't have 'DISTRIBUTED BY' clause -- Using column(s) named 'a' as the Greenplum Database data distribution key for this table.
 HINT:  The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew.
 create table stress_table (a int primary key, b int);

src/test/regress/expected/qp_gist_indexes4.out

@@ -170,7 +170,7 @@ INSERT INTO geometricTypes (seed, c, b, p)
    SeedToCircle(x), 
    SeedToBox(x), 
    SeedToPolygon(x)
-  FROM generate_series(1, 300000)x
+  FROM generate_series(1, 20000)x
  ;
 -- ----------------------------------------------------------------------
 -- Test: test05_select.sql

src/test/regress/expected/qp_gist_indexes4_optimizer.out

@@ -170,7 +170,7 @@ INSERT INTO geometricTypes (seed, c, b, p)
    SeedToCircle(x), 
    SeedToBox(x), 
    SeedToPolygon(x)
-  FROM generate_series(1, 300000)x
+  FROM generate_series(1, 20000)x
  ;
 -- ----------------------------------------------------------------------
 -- Test: test05_select.sql

src/test/regress/sql/qp_functions.sql

@@ -503,7 +503,7 @@ drop table tab_sour cascade;
 drop table fun_tree;
 drop table logtable;
 drop table db;
-create table stress_source as select a from generate_series(1,12000) a;
+create table stress_source as select a from generate_series(1,100) a;
 create table stress_table (a int primary key, b int);
 create or replace function stress_test() returns text as
                                         $body$

src/test/regress/sql/qp_gist_indexes4.sql

@@ -194,7 +194,7 @@ INSERT INTO geometricTypes (seed, c, b, p)
    SeedToCircle(x), 
    SeedToBox(x), 
    SeedToPolygon(x)
-  FROM generate_series(1, 300000)x
+  FROM generate_series(1, 20000)x
  ;
 
 

src/test/regress/sql/qp_with_clause.sql

@@ -9838,7 +9838,7 @@ CREATE TABLE foo (key INTEGER, value INTEGER);
 INSERT INTO foo SELECT i, i % 10 from generate_series(1, 100) i;
 
 CREATE TABLE bar(bar_key INTEGER, bar_value INTEGER);
-INSERT INTO bar SELECT i, i % 5 FROM generate_series(1, 100000) i;
+INSERT INTO bar SELECT i, i % 5 FROM generate_series(1, 1000) i;
 
 SET enable_hashjoin = OFF;
 SET enable_mergejoin = OFF;
@@ -10080,7 +10080,7 @@ SET gp_cte_sharing = ON;
 -------------------------------------------------------------------------------------------------------------------------------
 
 CREATE TABLE emp (ename CHARACTER VARYING(50), empno INTEGER, mgr INTEGER, deptno INTEGER);
-INSERT INTO emp SELECT i || 'NAME', i, i%6, i%16 FROM generate_series(1, 10000) i;
+INSERT INTO emp SELECT i || 'NAME', i, i%6, i%16 FROM generate_series(1, 100) i;
 
 CREATE TABLE manager (dept_mgr_no INTEGER);
 INSERT INTO manager SELECT i FROM generate_series(1, 100) i;