Stop enumerating plans in gp_optimizer [#143522031]

Now that we don't use optimizer_plan_id, also stop setting
optimizer_enable_space_pruning and optimizer_enumerate_plans. This
should speed up our test quite a bit.

(cherry picked from commit 74b90db3281c6e7fb3240a4ad565d3ebbd46b0a5)

src/test/regress/expected/gp_optimizer.out

@@ -8228,9 +8228,7 @@ insert into orca.t_date values('01-03-2012'::date,6,'tag1','tag2');
 insert into orca.t_date values('01-03-2012'::date,7,'tag1','tag2');
 insert into orca.t_date values('01-03-2012'::date,8,'tag1','tag2');
 insert into orca.t_date values('01-03-2012'::date,9,'tag1','tag2');
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
-set optimizer_enumerate_plans=on;
 explain select * from orca.t_date where user_id=9;
                                               QUERY PLAN                                              
 ------------------------------------------------------------------------------------------------------
@@ -8250,8 +8248,6 @@ select * from orca.t_date where user_id=9;
  01-03-2012 |       9 | tag1  | tag2 
 (1 row)
 
-reset optimizer_enable_space_pruning;
-set optimizer_enumerate_plans=off;
 set optimizer_enable_constant_expression_evaluation=off;
 drop table if exists orca.t_text;
 NOTICE:  table "t_text" does not exist, skipping
@@ -8278,9 +8274,7 @@ insert into orca.t_text values('01-03-2012'::date,6,'ugly','tag2');
 insert into orca.t_text values('01-03-2012'::date,7,'good','tag2');
 insert into orca.t_text values('01-03-2012'::date,8,'bad','tag2');
 insert into orca.t_text values('01-03-2012'::date,9,'ugly','tag2');
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
-set optimizer_enumerate_plans=on;
 explain select * from orca.t_text where user_id=9;
                                               QUERY PLAN                                              
 ------------------------------------------------------------------------------------------------------
@@ -8300,8 +8294,6 @@ select * from orca.t_text where user_id=9;
  01-03-2012 |       9 | ugly  | tag2 
 (1 row)
 
-reset optimizer_enable_space_pruning;
-set optimizer_enumerate_plans=off;
 set optimizer_enable_constant_expression_evaluation=off;
 -- create a user defined type and only define equality on it
 -- the type can be used in the partitioning list, but Orca is not able to pick a heterogenous index
@@ -8390,10 +8382,8 @@ insert into orca.t_ceeval_ints values(2, 100, 'tag1', 'tag2');
 insert into orca.t_ceeval_ints values(3, 100, 'tag1', 'tag2');
 insert into orca.t_ceeval_ints values(4, 101, 'tag1', 'tag2');
 insert into orca.t_ceeval_ints values(5, 102, 'tag1', 'tag2');
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
 set optimizer_use_external_constant_expression_evaluation_for_ints = on;
-set optimizer_enumerate_plans=on;
 explain select * from orca.t_ceeval_ints where user_id=4;
                                                  QUERY PLAN                                                  
 -------------------------------------------------------------------------------------------------------------
@@ -8413,8 +8403,6 @@ select * from orca.t_ceeval_ints where user_id=4;
        4 |         101 | tag1  | tag2 
 (1 row)
 
-reset optimizer_enable_space_pruning;
-reset optimizer_enumerate_plans;
 reset optimizer_use_external_constant_expression_evaluation_for_ints;
 reset optimizer_enable_constant_expression_evaluation;
 -- test project elements in TVF

src/test/regress/sql/gp_optimizer.sql

@@ -522,14 +522,10 @@ insert into orca.t_date values('01-03-2012'::date,7,'tag1','tag2');
 insert into orca.t_date values('01-03-2012'::date,8,'tag1','tag2');
 insert into orca.t_date values('01-03-2012'::date,9,'tag1','tag2');
 
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
-set optimizer_enumerate_plans=on;
 explain select * from orca.t_date where user_id=9;
 select * from orca.t_date where user_id=9;
 
-reset optimizer_enable_space_pruning;
-set optimizer_enumerate_plans=off;
 set optimizer_enable_constant_expression_evaluation=off;
 
 drop table if exists orca.t_text;
@@ -557,15 +553,11 @@ insert into orca.t_text values('01-03-2012'::date,7,'good','tag2');
 insert into orca.t_text values('01-03-2012'::date,8,'bad','tag2');
 insert into orca.t_text values('01-03-2012'::date,9,'ugly','tag2');
 
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
-set optimizer_enumerate_plans=on;
 
 explain select * from orca.t_text where user_id=9;
 select * from orca.t_text where user_id=9;
 
-reset optimizer_enable_space_pruning;
-set optimizer_enumerate_plans=off;
 set optimizer_enable_constant_expression_evaluation=off;
 
 -- create a user defined type and only define equality on it
@@ -628,16 +620,12 @@ insert into orca.t_ceeval_ints values(3, 100, 'tag1', 'tag2');
 insert into orca.t_ceeval_ints values(4, 101, 'tag1', 'tag2');
 insert into orca.t_ceeval_ints values(5, 102, 'tag1', 'tag2');
 
-set optimizer_enable_space_pruning=off;
 set optimizer_enable_constant_expression_evaluation=on;
 set optimizer_use_external_constant_expression_evaluation_for_ints = on;
-set optimizer_enumerate_plans=on;
 
 explain select * from orca.t_ceeval_ints where user_id=4;
 select * from orca.t_ceeval_ints where user_id=4;
 
-reset optimizer_enable_space_pruning;
-reset optimizer_enumerate_plans;
 reset optimizer_use_external_constant_expression_evaluation_for_ints;
 reset optimizer_enable_constant_expression_evaluation;