Parsed test spec with 2 sessions

starting permutation: s2_vacuum s2_mod s1_explain s1_begin s1_prepare s1_fetch_1 s2_vacuum s1_fetch_all s1_commit
step s2_vacuum: 
    VACUUM (TRUNCATE false) ios_bitmap;

step s2_mod: 
  DELETE FROM ios_bitmap WHERE a > 1;

step s1_explain: 
    EXPlAIN (COSTS OFF) DECLARE foo NO SCROLL CURSOR FOR SELECT row_number() OVER () FROM ios_bitmap WHERE a > 0 or b > 0;

QUERY PLAN                                         
---------------------------------------------------
WindowAgg                                          
  Window: w1 AS (ROWS UNBOUNDED PRECEDING)         
  ->  Bitmap Heap Scan on ios_bitmap               
        Recheck Cond: ((a > 0) OR (b > 0))         
        ->  BitmapOr                               
              ->  Bitmap Index Scan on ios_bitmap_a
                    Index Cond: (a > 0)            
              ->  Bitmap Index Scan on ios_bitmap_b
                    Index Cond: (b > 0)            
(9 rows)

step s1_begin: BEGIN;
step s1_prepare: 
    DECLARE foo NO SCROLL CURSOR FOR SELECT row_number() OVER () FROM ios_bitmap WHERE a > 0 or b > 0;

step s1_fetch_1: 
    FETCH FROM foo;

row_number
----------
         1
(1 row)

step s2_vacuum: 
    VACUUM (TRUNCATE false) ios_bitmap;

step s1_fetch_all: 
    FETCH ALL FROM foo;

row_number
----------
(0 rows)

step s1_commit: COMMIT;