1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
|
Parsed test spec with 2 sessions
starting permutation: pruner_create_perm ll_start pruner_query_plan pruner_query pruner_query pruner_delete pruner_query pruner_query ll_commit pruner_drop
step pruner_create_perm:
CREATE TABLE horizons_tst (data int unique) WITH (autovacuum_enabled = off);
INSERT INTO horizons_tst(data) VALUES(1),(2);
step ll_start:
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SELECT 1;
?column?
--------
1
(1 row)
step pruner_query_plan:
EXPLAIN (COSTS OFF) SELECT * FROM horizons_tst ORDER BY data;
QUERY PLAN
-----------------------------------------------------------
Index Only Scan using horizons_tst_data_key on horizons_tst
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_delete:
DELETE FROM horizons_tst;
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step ll_commit: COMMIT;
step pruner_drop:
DROP TABLE horizons_tst;
starting permutation: pruner_create_temp ll_start pruner_query_plan pruner_query pruner_query pruner_delete pruner_query pruner_query ll_commit pruner_drop
step pruner_create_temp:
CREATE TEMPORARY TABLE horizons_tst (data int unique) WITH (autovacuum_enabled = off);
INSERT INTO horizons_tst(data) VALUES(1),(2);
step ll_start:
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SELECT 1;
?column?
--------
1
(1 row)
step pruner_query_plan:
EXPLAIN (COSTS OFF) SELECT * FROM horizons_tst ORDER BY data;
QUERY PLAN
-----------------------------------------------------------
Index Only Scan using horizons_tst_data_key on horizons_tst
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_delete:
DELETE FROM horizons_tst;
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
0
(1 row)
step ll_commit: COMMIT;
step pruner_drop:
DROP TABLE horizons_tst;
starting permutation: pruner_create_temp ll_start pruner_query pruner_query pruner_begin pruner_delete pruner_query pruner_query ll_commit pruner_commit pruner_drop
step pruner_create_temp:
CREATE TEMPORARY TABLE horizons_tst (data int unique) WITH (autovacuum_enabled = off);
INSERT INTO horizons_tst(data) VALUES(1),(2);
step ll_start:
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SELECT 1;
?column?
--------
1
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_begin: BEGIN;
step pruner_delete:
DELETE FROM horizons_tst;
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step ll_commit: COMMIT;
step pruner_commit: COMMIT;
step pruner_drop:
DROP TABLE horizons_tst;
starting permutation: pruner_create_perm ll_start pruner_query pruner_query pruner_delete pruner_vacuum pruner_query pruner_query ll_commit pruner_drop
step pruner_create_perm:
CREATE TABLE horizons_tst (data int unique) WITH (autovacuum_enabled = off);
INSERT INTO horizons_tst(data) VALUES(1),(2);
step ll_start:
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SELECT 1;
?column?
--------
1
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_delete:
DELETE FROM horizons_tst;
step pruner_vacuum:
VACUUM horizons_tst;
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step ll_commit: COMMIT;
step pruner_drop:
DROP TABLE horizons_tst;
starting permutation: pruner_create_temp ll_start pruner_query pruner_query pruner_delete pruner_vacuum pruner_query pruner_query ll_commit pruner_drop
step pruner_create_temp:
CREATE TEMPORARY TABLE horizons_tst (data int unique) WITH (autovacuum_enabled = off);
INSERT INTO horizons_tst(data) VALUES(1),(2);
step ll_start:
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SELECT 1;
?column?
--------
1
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
2
(1 row)
step pruner_delete:
DELETE FROM horizons_tst;
step pruner_vacuum:
VACUUM horizons_tst;
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
0
(1 row)
step pruner_query:
SELECT explain_json($$
EXPLAIN (FORMAT json, BUFFERS, ANALYZE)
SELECT * FROM horizons_tst ORDER BY data;$$)->0->'Plan'->'Heap Fetches';
?column?
--------
0
(1 row)
step ll_commit: COMMIT;
step pruner_drop:
DROP TABLE horizons_tst;
|
