Subject: Re: Missed compiler optimization issue in function select_rtable_names_for_explain

From: Alvaro Herrera <[email-masked]>
Date: Wed, 22 May 2024 13:00:12 +0200

On 2024-May-22, XChy wrote:

> Hi everyone,
> 
> I'm a compiler developer working on detecting missed optimization in
> real-world applications. Recently, we found that LLVM missed a dead store
> elimination optimization in the PostgreSQL code <https://github.com/postgres/postgres/blob/c37267162e889fe783786b9e28d1b65b82365a00/src/backend/utils/adt/ruleutils.c#L3794> (https://github.com/postgres/postgres/blob/master/src/backend/utils/adt/ruleutils.c#L3794)
> in the master branch.

I think if we want to improve how this code is seen by the compiler by
modifying it, we should just remove the NULL/NIL assignments.  It's a
pretty arbitrary (and rather small) subset of fields being initialized,
fields which very obviously have been zeroed by memset already, so I
don't see any value in the explicit assignments.

The criteria may be different in cases where some struct has all of its
members initialized to something, because at least you can use that kind
of thing to find places you need to modify when adding new struct
members.  Not so in select_rtable_names_for_explain.

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/
"I can see support will not be a problem.  10 out of 10."    (Simon Wittber)
      (http://archives.postgresql.org/pgsql-general/2004-12/msg00159.php)

---

From: Daniel Gustafsson <[email-masked]>
Date: Wed, 22 May 2024 20:12:36 +0200

> On 22 May 2024, at 13:00, Alvaro Herrera <[email-masked]> wrote:

> modifying it, we should just remove the NULL/NIL assignments.

*If* the optimization is measurable, IMHO.

> It's a

My personal opinion is that there is value in immediately knowing the type of
the members from the inits, in this case I know without looking up the
definition that some of the members are list.  I like that readability.  That
being said, I for sure won't fight if there is concensus to remove.

--
Daniel Gustafsson

---

From: Tom Lane <[email-masked]>
Date: Wed, 22 May 2024 16:05:32 -0400

> don't see any value in the explicit assignments.

I have to concede that it's unclear why we're filling just these
fields explicitly and not any others.  We're at least consistent:
all the callers of select_rtable_names do it the same way.

			regards, tom lane

---

From: "Dirschel, Steve" <[email-masked]>
Date: Wed, 22 May 2024 20:42:39 +0000

The query and execution plan are shown below.  My question is related to the result set the optimizer is choosing to build the hash table from.  My understanding is for a hash join you want to build the hash table out of the smaller result set.  If you look at the execution plan below you can see the optimizer estimates 1000 rows from the seq scan of table collection and 120,000 rows from the seq scan of table docloc_test but is building the hash buckets from those 120000 rows rather than from the 1000 rows.  In our case under certain volume that causes that to spill to temp and under high load it hangs up the Aurora Postgres database.  But if it were to build the hash table out of those 1000 rows it would fit in work_mem so no problems.  Why is it picking the larger result set?

Another funky thing here-  here are the table definitions:

pgcci01ap=> \d CCI.COLLECTION

        Column        |              Type              | Collation | Nullable |                Default
----------------------+--------------------------------+-----------+----------+----------------------------------------
 collection_name      | character varying(40)          |           | not null |
 l_stage              | numeric(11,0)                  |           |          |
 p_stage              | numeric(11,0)                  |           |          |
 t_stage              | numeric(11,0)                  |           |          |
 last_upd_datetime    | timestamp(6) without time zone |           | not null |
 last_upd_inits       | character varying(30)          |           | not null |
 owner_name           | character varying(30)          |           |          |
 password             | character varying(30)          |           |          |
 email_address        | character varying(2000)        |           |          |
 available_flag       | character(1)                   |           |          |
 collection_id        | numeric(11,0)                  |           | not null |
 collection_type      | character varying(20)          |           |          |
 retrieval_password   | character varying(40)          |           |          |
 partner_coll_name    | character varying(40)          |           |          |
 relation2partner     | character varying(20)          |           |          |
 reload_flag          | character(1)                   |           |          | 'N'::bpchar
 partner_id           | character varying(40)          |           |          |
 content_timezone     | character varying(40)          |           | not null | 'America/Chicago'::character varying
 token_type           | character varying(30)          |           |          |
 cc_collection_dest   | character varying(40)          |           |          |
 auto_reclaim_enabled | character(1)                   |           | not null | 'N'::bpchar
 collection_family    | character varying(40)          |           | not null | '<COLLECTION NAME>'::character varying
 access_password      | character(40)                  |           |          |
 mic_group            | character varying(40)          |           |          |
 mic_type             | character varying(10)          |           |          |
 retrieval_source     | character varying(40)          |           | not null | 'DOC1'::character varying
Indexes:
    "xpkcollection" PRIMARY KEY, btree (collection_name)
    "xak1collection" UNIQUE CONSTRAINT, btree (collection_id)
    "xie1collection" btree (relation2partner)
    "xie2collection" btree (collection_family, collection_name)
    "xie3collection" btree (mic_group)
Referenced by:
    TABLE "cci.index_update_proc" CONSTRAINT "rfk12_index_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.authority_update_proc" CONSTRAINT "rfk1_authority_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.collection_event" CONSTRAINT "rfk1_collection_event" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.collection_pit" CONSTRAINT "rfk1_collection_pit" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.collection_stage" CONSTRAINT "rfk1_collection_stage" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.csloc_update_proc" CONSTRAINT "rfk1_csloc_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.docloc_update_proc" CONSTRAINT "rfk1_docloc_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.index_set_mrg" CONSTRAINT "rfk1_index_set_mrg" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.index_set_stats" CONSTRAINT "rfk1_index_set_stats" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.index_system_attr" CONSTRAINT "rfk1_index_system_attr" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.load_update_proc" CONSTRAINT "rfk1_load_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.metadoc_update_proc" CONSTRAINT "rfk1_metadoc_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.mm_update_process" CONSTRAINT "rfk1_mm_update_process" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.reclaim" CONSTRAINT "rfk1_reclaim" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.rel_grp_upd_proc" CONSTRAINT "rfk1_rel_grp_upd_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.toc_update_process" CONSTRAINT "rfk1_toc_update_process" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.view_definition" CONSTRAINT "rfk1_view_definition" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.dcsloc_collection_stats" CONSTRAINT "rfk1dcsloc_collection_stats" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.doc_data_domain" CONSTRAINT "rfk1doc_data_domain" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.doc_update_process" CONSTRAINT "rfk2_doc_update_process" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.dcsloc_partition_map" CONSTRAINT "rfk2dcsloc_partition_map" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
    TABLE "cci.meta_update_proc" CONSTRAINT "rfk3_metadoc_update_proc" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)

pgcci01ap=> \d docloc_test

      Column       |              Type              | Collation | Nullable |   Default
-------------------+--------------------------------+-----------+----------+-------------
 collection_name   | character varying(40)          |           | not null |
 stage_id          | numeric(11,0)                  |           | not null |
 begin_stage_id    | numeric(11,0)                  |           |          |
 last_upd_datetime | timestamp(6) without time zone |           |          |
 last_upd_inits    | character varying(30)          |           |          |
 docloc_check_type | character(1)                   |           | not null | 'S'::bpchar
 replicate_done    | character(1)                   |           | not null | 'N'::bpchar
 docloc_id         | numeric(11,0)                  |           |          |
Indexes:
    "xpkdocloc" PRIMARY KEY, btree (collection_name, stage_id)
Foreign-key constraints:
    "rfk1_docloc" FOREIGN KEY (collection_name, stage_id) REFERENCES cci.collection_stage(collection_name, stage_id)

pgcci01ap=> \d CCI.COLLECTION_PIT

      Column       |              Type              | Collation | Nullable | Default
-------------------+--------------------------------+-----------+----------+---------
 collection_name   | character varying(40)          |           | not null |
 pit_id            | numeric(11,0)                  |           | not null |
 stage_code        | character(1)                   |           | not null |
 stage_id          | numeric(11,0)                  |           | not null |
 last_upd_datetime | timestamp(6) without time zone |           | not null |
 last_upd_inits    | character varying(30)          |           | not null |
Indexes:
    "xpkcollection_pit" PRIMARY KEY, btree (collection_name, stage_code, pit_id, stage_id)
    "xak1collection_pit" UNIQUE, btree (collection_name, stage_code, pit_id, stage_id, last_upd_datetime DESC, last_upd_inits DESC)
    "xak2collection_pit" btree (collection_name, stage_code, stage_id)
Foreign-key constraints:
    "rfk1_collection_pit" FOREIGN KEY (collection_name) REFERENCES cci.collection(collection_name)
Triggers:
    td_collection_pit AFTER DELETE ON cci.collection_pit FOR EACH ROW EXECUTE FUNCTION cci."td_collection_pit$collection_pit"()

When running some tests I forgot to create the PK on table docloc_test.  When the PK was not on the table the optimizer decided to create the hash table off the 1000 rows from collection.  But as soon as I put the PK on that table it then decides to use docloc_test to build the hash table.  I can understand how the PK missing or not could impact the execution plan (full scanning the table and hash join vs nested looping to it) but in both cases docloc_test and collection were hash joined and the difference was which result set was used to build the hash table.  I cannot come up with any theory on why the existence of non-existence of this PK would impact which result set the hash table was built from.  In both cases the row estimates from collection and docloc_test were exactly the same in both plans (1000 from collection, 120000 fro mdocloc_test).

explain (analyze, buffers)
SELECT  DOCLOC.BEGIN_STAGE_ID, DOCLOC.COLLECTION_NAME, DOCLOC.DOCLOC_CHECK_TYPE, DOCLOC.DOCLOC_ID, DOCLOC.LAST_UPD_DATETIME, DOCLOC.LAST_UPD_INITS,
DOCLOC.REPLICATE_DONE, DOCLOC.STAGE_ID, COLLECTION.ACCESS_PASSWORD, COLLECTION.AUTO_RECLAIM_ENABLED, COLLECTION.AVAILABLE_FLAG, COLLECTION.CC_COLLECTION_DEST,
COLLECTION.COLLECTION_FAMILY, COLLECTION.COLLECTION_ID, COLLECTION.COLLECTION_NAME, COLLECTION.COLLECTION_TYPE, COLLECTION.CONTENT_TIMEZONE, COLLECTION.EMAIL_ADDRESS,
COLLECTION.LAST_UPD_DATETIME, COLLECTION.LAST_UPD_INITS, COLLECTION.L_STAGE, COLLECTION.MIC_GROUP, COLLECTION.MIC_TYPE, COLLECTION.OWNER_NAME,
COLLECTION.PARTNER_COLL_NAME, COLLECTION.PARTNER_ID, COLLECTION.PASSWORD, COLLECTION.P_STAGE, COLLECTION.RELATION2PARTNER, COLLECTION.RELOAD_FLAG,
COLLECTION.RETRIEVAL_PASSWORD, COLLECTION.RETRIEVAL_SOURCE, COLLECTION.TOKEN_TYPE, COLLECTION.T_STAGE
FROM DOCLOC_test docloc, CCI.COLLECTION
WHERE  COLLECTION.COLLECTION_ID IN (2188,15418,1427,1425,4584,1424,1429,1426,1638,1639,1640,1641,1642,1684,1685,1686,1428,13727,7421,7422,2189,5145,2599,2992,9245,9246,9247,9248,9249,9250,9251,9252,5121,19614,-6322,928,1544,-14765,929,-6323,930,931,932,1542,3890,6594,8986,-6279,19631,1466,19639,1467,1468,1475,1540,3892,-6348,
-6358,4753,1978,1977,1966,2687,2686,2674,-6350,3060,3600,426,3654,2718,1824,445,496,556,432,421,423,471,16152,16362,16154,16155,16156,16157,16799,507,573,574,404,524,743,15388,694,3537,1408,10097,9376,9375,10098,9377,8559,8557,1599,1963,1976,8551,8555,8848,8552,8554,8734,8735,10306,8739,8736,
8737,9253,9254,9255,9256,9257,9258,9063,9194,9065,9066,9067,9068,9069,9070,9071,9072,9177,9178,9179,9180,9181,9182,9183,9184,9093,4222,3048,3116,6971,6972,6973,6974,2675,8387,2360,2672,2673,2681,2682,2683,1528,2671,2676,7438,2678,2677,2679,2685,2684,2361,2680,2688,3533,10605,349,385,396,631,
2541,1396,1979,3022,1980,138,12,6835,10609,7164,5307,6863,6864,20444,695,1815,514,600,601,602,603,604,605,3069,2321,790,446,490,6520,2006,3157,3158,3917,419,461,437,555,748,464,427,3539,16158,8738,8733,18,3628,3626,3627,4805,4806,5054,3630,3629,3631,4807,3634,4714,240,13710,7227,8909,8910,
8911,10730,8912,8951,2019,7315,7078,7930,7928,7929,693,7261,7262,239,242,8952,7228,330,328,7079,4812,4813,6975,14410,6976,6977,6978,6979,6980,6981,6982,6983,6984,6985,6986,6987,6988,6989,6990,6991,6992,6993,6994,6995,6996,6997,6998,6999,7000,7001,7002,7003,7004,7828,7829,4479,6544,10706,
10707,6545,4010,4011,6598,6847,6850,6848,6851,2892,6484,6486,6485,4009,4012,3040,3039,10746,8233,4476,4477,7255,6889,5139,7464,7465,7466,8388,7469,16159,16160,752,3540,831,3147,3148,3149,3137,5481,9161,1825,2028,9230,460,642,1827,8950,751,2833,3162,1990,1523,755,2013,754,1829,467,753,474,
2793,703,1632,412,4814,4815,4816,540,541,1406,2020,6795,7220,9554,9555,9556,2999,17387,17388,17443,17444,10682,10681,10683,10686,10684,10687,10685,10688,20,2510,155,21,22,26,27,28,29,30,31,32,33,7005,7006,7007,7008,7009,7010,7011,7125,7013,7014,7015,7016,7017,7018,7019,7020,6970,1512,2439,
17844,2959,16211,2506,1450,3211,1598,2037,3587,8563,8564,8565,8566,7468,8393,7467,8276,8392,3575,3576,9576,10516,3557,6900,1819,1809,1808,1805,1804,1807,1806,8558,10610,16806,16807,16808,16809,16810,2523,16811,16812,2522,3907,15,17,3817,3798,3810,3794,3821,3808,837,758,15389,757,814,548,
1419,3163,2957,15498,15499,2539,10295,16381,2032,1315,716,1421,16800,762,1833,8612,2039,17684,17685,15500,1834,1566,425,468,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,19880,379,19881,19884,19885,383,19886,19888,203,50,51,52,53,54,55,8567,8568,8569,8570,8571,8572,8573,8574,8575,8576,
8577,8578,8579,8580,8581,8582,8583,8584,8585,8586,8587,8588,8589,8590,8591,8592,8593,8594,8595,8596,8953,3811,7196,3784,3785,7216,7211,3800,9175,4701,3781,7215,7210,3813,3828,3789,7217,7212,3818,3792,3832,3829,3804,3807,7218,7213,5102,3809,7214,5095,3830,10034,4988,2924,2925,4553,4554,7221,
7222,7869,8271,8275,8410,16161,16162,8411,9428,414,476,935,20533,20534,20668,20679,20680,710,1401,433,2040,1838,3164,1853,8835,20681,2844,3165,16163,16164,771,56,2499,2501,235,57,58,59,60,61,62,63,141,202,2502,190,191,192,189,140,534,535,2508,139,533,536,199,200,2500,304,305,306,307,8597,
8598,8599,8600,8601,8602,8785,3586,3585,1612,1613,1614,1616,1617,1647,1648,1649,1652,1820,16375,13728,14411,2046,2047,2186,2263,2318,2432,2448,2442,2487,2525,2527,2535,2537,2544,22013,22014,22015,22016,769,2794,2200,484,1949,7360,8896,1812,3139,7115,2660,6912,659,3071,8647,711,1962,4002,16801,
705,6911,774,16166,16167,4495,778,7205,706,672,3054,449,2958,308,309,310,311,312,313,314,315,316,317,318,319,15400,15401,15402,15403,16685,15405,15406,15407,15408,15409,15410,15411,15412,15413,15414,16210,233,2507,2691,2692,2695,2801,2805,2806,2818,2905,2845,2987,2995,3026,3049,3050,3052,3066,
3091,3095,3186,3526,3649,3888,3884,3886,4288,4378,4517,4916,4917,5003,8561,21903,21911,21927,14644,1411,707,463,15501,1950,405,671,3055,15394,1170,1168,3152,9163,16382,16217,1844,417,2444,1841,2035,781,16363,2721,684,784,10571,782,462,646,3056,443,479,2007,3167,3168,118,2509,17019,17020,17021,
17022,17023,17445,17446,14395,17447,17448,17449,1447,247,3908,2187,1646,2511,3974,3975,3982,3983,3984,3985,3986,3987,3988,3989,3990,3991,3992,21880,21881,21885,21886,21887,21889,21890,21891,21939,21942,13714,21943,21945,21946,21962,4556,16218,4557,6539,4555,7452,1410,420,454,16169,16170,16171,
16172,16173,1872,16174,785,1847,1454,16175,-703,406,525,526,788,470,742,1947,7195,793,3153,503,563,564,2834,444,3993,3994,3995,3996,3997,3998,3999,4297,4298,4299,4300,4301,4302,4303,4434,4435,4436,4437,4438,4439,4440,4441,4442,4443,4444,4445,4446,4447,4448,4449,4450,4451,4452,4453,21940,21941,
21975,21977,21978,21979,21981,18232,8054,8055,8060,8058,8059,8056,8057,18233,18234,18235,18236,18237,8042,8043,8044,8045,8046,8047,8048,8049,8050,8051,8052,21985,21986,21969,21982,21983,4481,2720,741,16176,15395,3602,409,1811,16365,599,3072,4044,799,1869,3141,403,480)
AND COLLECTION.COLLECTION_NAME=DOCLOC.COLLECTION_NAME
AND DOCLOC.STAGE_ID=
    (SELECT MAX (STAGE_ID)
       FROM CCI.COLLECTION_PIT
      WHERE COLLECTION_PIT.COLLECTION_NAME=COLLECTION.COLLECTION_NAME
        AND COLLECTION_PIT.PIT_ID<=2147483647
        AND COLLECTION_PIT.STAGE_CODE='F');

The plan below was executed with work_mem at 12 MB so it's not spilling to temp but this is only for my session.  At 4MB it will spill to temp.

Hash Join  (cost=4302.50..5658.10 rows=1 width=529) (actual time=67.959..81.185 rows=496 loops=1)
   Hash Cond: (((collection.collection_name)::text = (docloc.collection_name)::text) AND ((SubPlan 2) = docloc.stage_id))
   Buffers: shared hit=7735
   ->  Seq Scan on collection  (cost=2.50..1040.08 rows=1000 width=478) (actual time=0.058..4.327 rows=1000 loops=1)
         Filter: (collection_id = ANY ('{2188,15418,1427,1425,4584,1424,1429,1426,1638,1639,1640,1641,1642,1684,1685,1686,1428,13727,7421,7422,2189,5145,2599,2992,9245,9246,9247,9248,9249,9250,9251,9252,5
121,19614,-6322,928,1544,-14765,929,-6323,930,931,932,1542,3890,6594,8986,-6279,19631,1466,19639,1467,1468,1475,1540,3892,-6348,-6358,4753,1978,1977,1966,2687,2686,2674,-6350,3060,3600,426,3654,2718,1824,
445,496,556,432,421,423,471,16152,16362,16154,16155,16156,16157,16799,507,573,574,404,524,743,15388,694,3537,1408,10097,9376,9375,10098,9377,8559,8557,1599,1963,1976,8551,8555,8848,8552,8554,8734,8735,103
06,8739,8736,8737,9253,9254,9255,9256,9257,9258,9063,9194,9065,9066,9067,9068,9069,9070,9071,9072,9177,9178,9179,9180,9181,9182,9183,9184,9093,4222,3048,3116,6971,6972,6973,6974,2675,8387,2360,2672,2673,2
681,2682,2683,1528,2671,2676,7438,2678,2677,2679,2685,2684,2361,2680,2688,3533,10605,349,385,396,631,2541,1396,1979,3022,1980,138,12,6835,10609,7164,5307,6863,6864,20444,695,1815,514,600,601,602,603,604,6
05,3069,2321,790,446,490,6520,2006,3157,3158,3917,419,461,437,555,748,464,427,3539,16158,8738,8733,18,3628,3626,3627,4805,4806,5054,3630,3629,3631,4807,3634,4714,240,13710,7227,8909,8910,8911,10730,8912,8
951,2019,7315,7078,7930,7928,7929,693,7261,7262,239,242,8952,7228,330,328,7079,4812,4813,6975,14410,6976,6977,6978,6979,6980,6981,6982,6983,6984,6985,6986,6987,6988,6989,6990,6991,6992,6993,6994,6995,6996
,6997,6998,6999,7000,7001,7002,7003,7004,7828,7829,4479,6544,10706,10707,6545,4010,4011,6598,6847,6850,6848,6851,2892,6484,6486,6485,4009,4012,3040,3039,10746,8233,4476,4477,7255,6889,5139,7464,7465,7466,
8388,7469,16159,16160,752,3540,831,3147,3148,3149,3137,5481,9161,1825,2028,9230,460,642,1827,8950,751,2833,3162,1990,1523,755,2013,754,1829,467,753,474,2793,703,1632,412,4814,4815,4816,540,541,1406,2020,6
795,7220,9554,9555,9556,2999,17387,17388,17443,17444,10682,10681,10683,10686,10684,10687,10685,10688,20,2510,155,21,22,26,27,28,29,30,31,32,33,7005,7006,7007,7008,7009,7010,7011,7125,7013,7014,7015,7016,7
017,7018,7019,7020,6970,1512,2439,17844,2959,16211,2506,1450,3211,1598,2037,3587,8563,8564,8565,8566,7468,8393,7467,8276,8392,3575,3576,9576,10516,3557,6900,1819,1809,1808,1805,1804,1807,1806,8558,10610,1
6806,16807,16808,16809,16810,2523,16811,16812,2522,3907,15,17,3817,3798,3810,3794,3821,3808,837,758,15389,757,814,548,1419,3163,2957,15498,15499,2539,10295,16381,2032,1315,716,1421,16800,762,1833,8612,203
9,17684,17685,15500,1834,1566,425,468,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,19880,379,19881,19884,19885,383,19886,19888,203,50,51,52,53,54,55,8567,8568,8569,8570,8571,8572,8573,8574,8575,8576,85
77,8578,8579,8580,8581,8582,8583,8584,8585,8586,8587,8588,8589,8590,8591,8592,8593,8594,8595,8596,8953,3811,7196,3784,3785,7216,7211,3800,9175,4701,3781,7215,7210,3813,3828,3789,7217,7212,3818,3792,3832,3
829,3804,3807,7218,7213,5102,3809,7214,5095,3830,10034,4988,2924,2925,4553,4554,7221,7222,7869,8271,8275,8410,16161,16162,8411,9428,414,476,935,20533,20534,20668,20679,20680,710,1401,433,2040,1838,3164,18
53,8835,20681,2844,3165,16163,16164,771,56,2499,2501,235,57,58,59,60,61,62,63,141,202,2502,190,191,192,189,140,534,535,2508,139,533,536,199,200,2500,304,305,306,307,8597,8598,8599,8600,8601,8602,8785,3586
,3585,1612,1613,1614,1616,1617,1647,1648,1649,1652,1820,16375,13728,14411,2046,2047,2186,2263,2318,2432,2448,2442,2487,2525,2527,2535,2537,2544,22013,22014,22015,22016,769,2794,2200,484,1949,7360,8896,181
2,3139,7115,2660,6912,659,3071,8647,711,1962,4002,16801,705,6911,774,16166,16167,4495,778,7205,706,672,3054,449,2958,308,309,310,311,312,313,314,315,316,317,318,319,15400,15401,15402,15403,16685,15405,154
06,15407,15408,15409,15410,15411,15412,15413,15414,16210,233,2507,2691,2692,2695,2801,2805,2806,2818,2905,2845,2987,2995,3026,3049,3050,3052,3066,3091,3095,3186,3526,3649,3888,3884,3886,4288,4378,4517,491
6,4917,5003,8561,21903,21911,21927,14644,1411,707,463,15501,1950,405,671,3055,15394,1170,1168,3152,9163,16382,16217,1844,417,2444,1841,2035,781,16363,2721,684,784,10571,782,462,646,3056,443,479,2007,3167,
3168,118,2509,17019,17020,17021,17022,17023,17445,17446,14395,17447,17448,17449,1447,247,3908,2187,1646,2511,3974,3975,3982,3983,3984,3985,3986,3987,3988,3989,3990,3991,3992,21880,21881,21885,21886,21887,
21889,21890,21891,21939,21942,13714,21943,21945,21946,21962,4556,16218,4557,6539,4555,7452,1410,420,454,16169,16170,16171,16172,16173,1872,16174,785,1847,1454,16175,-703,406,525,526,788,470,742,1947,7195,
793,3153,503,563,564,2834,444,3993,3994,3995,3996,3997,3998,3999,4297,4298,4299,4300,4301,4302,4303,4434,4435,4436,4437,4438,4439,4440,4441,4442,4443,4444,4445,4446,4447,4448,4449,4450,4451,4452,4453,2194
0,21941,21975,21977,21978,21979,21981,18232,8054,8055,8060,8058,8059,8056,8057,18233,18234,18235,18236,18237,8042,8043,8044,8045,8046,8047,8048,8049,8050,8051,8052,21985,21986,21969,21982,21983,4481,2720,
741,16176,15395,3602,409,1811,16365,599,3072,4044,799,1869,3141,403,480}'::numeric[]))
         Rows Removed by Filter: 15110
         Buffers: shared hit=598
   ->  Hash  (cost=2500.00..2500.00 rows=120000 width=51) (actual time=67.466..67.467 rows=120000 loops=1)
         Buckets: 131072  Batches: 1  Memory Usage: 11485kB
         Buffers: shared hit=1300
         ->  Seq Scan on docloc_test docloc  (cost=0.00..2500.00 rows=120000 width=51) (actual time=0.004..22.313 rows=120000 loops=1)
               Buffers: shared hit=1300
   SubPlan 2
     ->  Result  (cost=6.25..6.26 rows=1 width=32) (actual time=0.005..0.005 rows=1 loops=1496)
           Buffers: shared hit=5837
           InitPlan 1 (returns $1)
             ->  Limit  (cost=0.42..6.25 rows=1 width=6) (actual time=0.005..0.005 rows=1 loops=1496)
                   Buffers: shared hit=5837
                   ->  Index Scan Backward using xak2collection_pit on collection_pit  (cost=0.42..64.50 rows=11 width=6) (actual time=0.004..0.004 rows=1 loops=1496)
                         Index Cond: (((collection_name)::text = (collection.collection_name)::text) AND (stage_code = 'F'::bpchar) AND (stage_id IS NOT NULL))
                         Filter: (pit_id <= '2147483647'::numeric)
                         Buffers: shared hit=5837
 Planning:
   Buffers: shared hit=78
 Planning Time: 2.287 ms
 Execution Time: 83.361 ms

Thanks in advance.
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