Parsed test spec with 2 sessions

starting permutation: rxy1 wx1 c1 rxy2 wy2 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2233750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;

starting permutation: rxy2 wy2 c2 rxy1 wx1 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
316250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;

starting permutation: rxy3 wx3 c1 rxy4 wy4 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;

starting permutation: rxy4 wy4 c2 rxy3 wx3 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;

starting permutation: rxy1 wx1 rxy2 c1 wy2 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step c1: commit;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c2: commit;

starting permutation: rxy1 wx1 rxy2 wy2 c1 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 wx1 rxy2 wy2 c2 c1
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 rxy2 wx1 c1 wy2 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c2: commit;

starting permutation: rxy1 rxy2 wx1 wy2 c1 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 rxy2 wx1 wy2 c2 c1
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 rxy2 wy2 wx1 c1 c2
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 rxy2 wy2 wx1 c2 c1
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy1 rxy2 wy2 c2 wx1 c1
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c1: commit;

starting permutation: rxy2 rxy1 wx1 c1 wy2 c2
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c2: commit;

starting permutation: rxy2 rxy1 wx1 wy2 c1 c2
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 rxy1 wx1 wy2 c2 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 rxy1 wy2 wx1 c1 c2
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 rxy1 wy2 wx1 c2 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 rxy1 wy2 c2 wx1 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step c2: commit;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c1: commit;

starting permutation: rxy2 wy2 rxy1 wx1 c1 c2
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c1: commit;
step c2: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 wy2 rxy1 wx1 c2 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
step c2: commit;
step c1: commit;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxy2 wy2 rxy1 c2 wx1 c1
step rxy2: select sum(p[0]) from gist_point_tbl where p >> point(7500,7500);
    sum
-------
2188750
(1 row)

step wy2: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(1, 5) g;
step rxy1: select sum(p[0]) from gist_point_tbl where p << point(2500, 2500);
   sum
------
311250
(1 row)

step c2: commit;
step wx1: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(15, 20) g;
ERROR:  could not serialize access due to read/write dependencies among transactions
step c1: commit;

starting permutation: rxy3 wx3 rxy4 c1 wy4 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step c1: commit;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;

starting permutation: rxy3 wx3 rxy4 wy4 c1 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c1: commit;
step c2: commit;

starting permutation: rxy3 wx3 rxy4 wy4 c2 c1
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step c1: commit;

starting permutation: rxy3 rxy4 wx3 c1 wy4 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;

starting permutation: rxy3 rxy4 wx3 wy4 c1 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c1: commit;
step c2: commit;

starting permutation: rxy3 rxy4 wx3 wy4 c2 c1
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step c1: commit;

starting permutation: rxy3 rxy4 wy4 wx3 c1 c2
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step c2: commit;

starting permutation: rxy3 rxy4 wy4 wx3 c2 c1
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c2: commit;
step c1: commit;

starting permutation: rxy3 rxy4 wy4 c2 wx3 c1
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;

starting permutation: rxy4 rxy3 wx3 c1 wy4 c2
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;

starting permutation: rxy4 rxy3 wx3 wy4 c1 c2
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c1: commit;
step c2: commit;

starting permutation: rxy4 rxy3 wx3 wy4 c2 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step c1: commit;

starting permutation: rxy4 rxy3 wy4 wx3 c1 c2
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step c2: commit;

starting permutation: rxy4 rxy3 wy4 wx3 c2 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c2: commit;
step c1: commit;

starting permutation: rxy4 rxy3 wy4 c2 wx3 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step c2: commit;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;

starting permutation: rxy4 wy4 rxy3 wx3 c1 c2
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;
step c2: commit;

starting permutation: rxy4 wy4 rxy3 wx3 c2 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c2: commit;
step c1: commit;

starting permutation: rxy4 wy4 rxy3 c2 wx3 c1
step rxy4: select sum(p[0]) from gist_point_tbl where p << point(1000,1000);
  sum
-----
49500
(1 row)

step wy4: insert into gist_point_tbl (id, p)
			  select g, point(g*50, g*50) from generate_series(1, 20) g;
step rxy3: select sum(p[0]) from gist_point_tbl where p >> point(6000,6000);
    sum
-------
3202000
(1 row)

step c2: commit;
step wx3: insert into gist_point_tbl (id, p)
			  select g, point(g*500, g*500) from generate_series(12, 18) g;
step c1: commit;