Hash join and picking which result set to build the hash table with.

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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