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Fix LOCF with out-of-order columns error #8545

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Merged
merged 1 commit into from
Aug 27, 2025
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Fix LOCF with out-of-order columns error #8545

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2 changes: 2 additions & 0 deletions .unreleased/pr_8545
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fixes: #8545 Error in LOCF/Interpolate with out-of-order and repeated columns
Thanks: @moodgorning for reporting a bug in queries with LOCF/Interpolate using out-of-order columns
1 change: 1 addition & 0 deletions tsl/src/nodes/gapfill/gapfill_exec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1420,6 +1420,7 @@ gapfill_adjust_varnos(GapFillState *state, Expr *expr)
if (IsA(tle->expr, Var) && castNode(Var, tle->expr)->varattno == var->varattno)
{
var->varattno = tle->resno;
break;
}
}
}
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118 changes: 118 additions & 0 deletions tsl/test/shared/expected/gapfill_bug.out
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Original file line number Diff line number Diff line change
Expand Up @@ -108,3 +108,121 @@ FROM data GROUP BY 1,2,3 ORDER BY 1,2,3;

drop table tw cascade;
RESET timezone;
-- Fix for 2nd issue reported in #4894: "time_bucket_gapfil" with "locf/interpolate"
-- using out-of-order and repeated columns, resulting in below error:
-- ERROR: attribute 5 of type record has wrong type
-- Should return correct data with no error
WITH el_data(time,position_id,measurement_value,measurement_type,src_mac_id,stream_index,delta) AS(
VALUES
('2025-07-05 23:57:19.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:12:19.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-901),
('2025-07-06 00:27:20.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110560),
('2025-07-06 00:06:12.000000 +00:00'::timestamptz,'9f2e566b-8c26-4ead-ad24-12841c79a932'::uuid,25.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:21:12.000000 +00:00'::timestamptz,'9f2e566b-8c26-4ead-ad24-12841c79a932'::uuid,25.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110928),
('2025-07-06 00:02:57.000000 +00:00'::timestamptz,'09ca0d92-1eb5-4d07-adbc-2bb500817cc7'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-901),
('2025-07-06 00:17:58.000000 +00:00'::timestamptz,'09ca0d92-1eb5-4d07-adbc-2bb500817cc7'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3111122),
('2025-07-06 00:06:02.000000 +00:00'::timestamptz,'e0145b95-6faa-4eb3-815d-5d0a91ba909c'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:21:02.000000 +00:00'::timestamptz,'e0145b95-6faa-4eb3-815d-5d0a91ba909c'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110938),
('2025-07-06 00:04:48.000000 +00:00'::timestamptz,'d439a8fc-7285-4d32-82bc-2105c9ed2d52'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:19:48.000000 +00:00'::timestamptz,'d439a8fc-7285-4d32-82bc-2105c9ed2d52'::uuid,24.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3111012),
('2025-07-06 00:07:00.000000 +00:00'::timestamptz,'4aa9b368-b9c4-4b15-bfcc-c67b1931dd11'::uuid,25::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:22:00.000000 +00:00'::timestamptz,'4aa9b368-b9c4-4b15-bfcc-c67b1931dd11'::uuid,24.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110880),
('2025-07-06 00:08:03.000000 +00:00'::timestamptz,'64dc15d6-3988-4320-8f18-16ef8512990e'::uuid,30.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:23:03.000000 +00:00'::timestamptz,'64dc15d6-3988-4320-8f18-16ef8512990e'::uuid,30.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110817),
('2025-07-05 23:57:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300),
('2025-07-06 00:02:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300),
('2025-07-06 00:07:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300)
)
,
el_nodes_data(time,src_mac_id,stream_index,position_id,measurement_type,measurement_value) as(
VALUES
('2025-07-05 23:42:20.000000 +00:00'::timestamptz,'FFFF000D6F4DA7B2',3,'2da82d12-5ceb-4470-b60b-9660b755d052','temperature_ambient',26::numeric),
('2025-07-06 00:51:09.000000 +00:00'::timestamptz,'FFFF000D6F4DA7B2',3,'2da82d12-5ceb-4470-b60b-9660b755d052','temperature_ambient',26::numeric)
)
SELECT
time_bucket_gapfill('5 minutes', m.time,
start := '2025-07-05 23:55:00+00:00'::timestamptz, finish := '2025-07-06 00:30:00+00:00'::timestamptz) AS intervals,
m.position_id,
m.src_mac_id,
m.stream_index,
m.measurement_type,
m.stream_index,
locf(last(m.measurement_value, m.time)
,
(SELECT d2.measurement_value FROM el_nodes_data d2
WHERE d2.measurement_type = m.measurement_type
AND d2.src_mac_id = m.src_mac_id
AND d2.stream_index = m.stream_index
AND d2.time < '2025-07-05 23:55:00+00:00'
AND d2.time > '2025-07-05 23:55:00+00:00'::timestamptz - INTERVAL '30 minutes'
ORDER BY d2.time DESC LIMIT 1)
) AS locf_measurement_value
FROM el_data m
GROUP BY
time_bucket_gapfill('5 minutes', m.time, start := '2025-07-05 23:55:00+00:00'::timestamptz,
finish := '2025-07-06 00:30:00+00:00'::timestamptz), -- avoid alias here
m.position_id,m.src_mac_id, m.stream_index, m.measurement_type
ORDER BY
time_bucket_gapfill('5 minutes', m.time, start := '2025-07-05 23:55:00+00:00'::timestamptz,
finish := '2025-07-06 00:30:00+00:00'::timestamptz), -- avoid alias here
m.position_id,m.src_mac_id, m.stream_index, m.measurement_type;
intervals | position_id | src_mac_id | stream_index | measurement_type | stream_index | locf_measurement_value
------------------------------+--------------------------------------+------------------+--------------+---------------------+--------------+------------------------
Sat Jul 05 16:55:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 16:55:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 16:55:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 16:55:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 16:55:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 16:55:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 16:55:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 16:55:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 17:00:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:00:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:00:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 17:00:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 17:00:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 17:00:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:00:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:00:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26
Sat Jul 05 17:05:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:05:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:05:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25
Sat Jul 05 17:05:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 30.5
Sat Jul 05 17:05:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25.5
Sat Jul 05 17:05:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:05:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:05:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:10:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:10:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:10:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25
Sat Jul 05 17:10:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 30.5
Sat Jul 05 17:10:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25.5
Sat Jul 05 17:10:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:10:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:10:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:15:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:15:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:15:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25
Sat Jul 05 17:15:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 30.5
Sat Jul 05 17:15:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25.5
Sat Jul 05 17:15:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:15:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24.5
Sat Jul 05 17:15:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:20:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:20:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:20:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24.5
Sat Jul 05 17:20:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 30.5
Sat Jul 05 17:20:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25.5
Sat Jul 05 17:20:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:20:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24.5
Sat Jul 05 17:20:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
Sat Jul 05 17:25:00 2025 PDT | 09ca0d92-1eb5-4d07-adbc-2bb500817cc7 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:25:00 2025 PDT | 2da82d12-5ceb-4470-b60b-9660b755d052 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 26.5
Sat Jul 05 17:25:00 2025 PDT | 4aa9b368-b9c4-4b15-bfcc-c67b1931dd11 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24.5
Sat Jul 05 17:25:00 2025 PDT | 64dc15d6-3988-4320-8f18-16ef8512990e | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 30.5
Sat Jul 05 17:25:00 2025 PDT | 9f2e566b-8c26-4ead-ad24-12841c79a932 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 25.5
Sat Jul 05 17:25:00 2025 PDT | bb044d29-c136-412d-a193-354f090dafcb | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 23
Sat Jul 05 17:25:00 2025 PDT | d439a8fc-7285-4d32-82bc-2105c9ed2d52 | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24.5
Sat Jul 05 17:25:00 2025 PDT | e0145b95-6faa-4eb3-815d-5d0a91ba909c | FFFF000D6F4DA7B2 | 3 | temperature_ambient | 3 | 24
(56 rows)

60 changes: 60 additions & 0 deletions tsl/test/shared/sql/gapfill_bug.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -73,3 +73,63 @@ FROM data GROUP BY 1,2,3 ORDER BY 1,2,3;

drop table tw cascade;
RESET timezone;

-- Fix for 2nd issue reported in #4894: "time_bucket_gapfil" with "locf/interpolate"
-- using out-of-order and repeated columns, resulting in below error:
-- ERROR: attribute 5 of type record has wrong type

-- Should return correct data with no error
WITH el_data(time,position_id,measurement_value,measurement_type,src_mac_id,stream_index,delta) AS(
VALUES
('2025-07-05 23:57:19.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:12:19.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-901),
('2025-07-06 00:27:20.000000 +00:00'::timestamptz,'2da82d12-5ceb-4470-b60b-9660b755d052'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110560),
('2025-07-06 00:06:12.000000 +00:00'::timestamptz,'9f2e566b-8c26-4ead-ad24-12841c79a932'::uuid,25.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:21:12.000000 +00:00'::timestamptz,'9f2e566b-8c26-4ead-ad24-12841c79a932'::uuid,25.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110928),
('2025-07-06 00:02:57.000000 +00:00'::timestamptz,'09ca0d92-1eb5-4d07-adbc-2bb500817cc7'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-901),
('2025-07-06 00:17:58.000000 +00:00'::timestamptz,'09ca0d92-1eb5-4d07-adbc-2bb500817cc7'::uuid,26.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3111122),
('2025-07-06 00:06:02.000000 +00:00'::timestamptz,'e0145b95-6faa-4eb3-815d-5d0a91ba909c'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:21:02.000000 +00:00'::timestamptz,'e0145b95-6faa-4eb3-815d-5d0a91ba909c'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110938),
('2025-07-06 00:04:48.000000 +00:00'::timestamptz,'d439a8fc-7285-4d32-82bc-2105c9ed2d52'::uuid,24::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:19:48.000000 +00:00'::timestamptz,'d439a8fc-7285-4d32-82bc-2105c9ed2d52'::uuid,24.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3111012),
('2025-07-06 00:07:00.000000 +00:00'::timestamptz,'4aa9b368-b9c4-4b15-bfcc-c67b1931dd11'::uuid,25::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:22:00.000000 +00:00'::timestamptz,'4aa9b368-b9c4-4b15-bfcc-c67b1931dd11'::uuid,24.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110880),
('2025-07-06 00:08:03.000000 +00:00'::timestamptz,'64dc15d6-3988-4320-8f18-16ef8512990e'::uuid,30.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-900),
('2025-07-06 00:23:03.000000 +00:00'::timestamptz,'64dc15d6-3988-4320-8f18-16ef8512990e'::uuid,30.5::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-3110817),
('2025-07-05 23:57:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300),
('2025-07-06 00:02:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300),
('2025-07-06 00:07:13.000000 +00:00'::timestamptz,'bb044d29-c136-412d-a193-354f090dafcb'::uuid,23::numeric,'temperature_ambient','FFFF000D6F4DA7B2',3,-300)
)
,
el_nodes_data(time,src_mac_id,stream_index,position_id,measurement_type,measurement_value) as(
VALUES
('2025-07-05 23:42:20.000000 +00:00'::timestamptz,'FFFF000D6F4DA7B2',3,'2da82d12-5ceb-4470-b60b-9660b755d052','temperature_ambient',26::numeric),
('2025-07-06 00:51:09.000000 +00:00'::timestamptz,'FFFF000D6F4DA7B2',3,'2da82d12-5ceb-4470-b60b-9660b755d052','temperature_ambient',26::numeric)
)
SELECT
time_bucket_gapfill('5 minutes', m.time,
start := '2025-07-05 23:55:00+00:00'::timestamptz, finish := '2025-07-06 00:30:00+00:00'::timestamptz) AS intervals,
m.position_id,
m.src_mac_id,
m.stream_index,
m.measurement_type,
m.stream_index,
locf(last(m.measurement_value, m.time)
,
(SELECT d2.measurement_value FROM el_nodes_data d2
WHERE d2.measurement_type = m.measurement_type
AND d2.src_mac_id = m.src_mac_id
AND d2.stream_index = m.stream_index
AND d2.time < '2025-07-05 23:55:00+00:00'
AND d2.time > '2025-07-05 23:55:00+00:00'::timestamptz - INTERVAL '30 minutes'
ORDER BY d2.time DESC LIMIT 1)
) AS locf_measurement_value
FROM el_data m
GROUP BY
time_bucket_gapfill('5 minutes', m.time, start := '2025-07-05 23:55:00+00:00'::timestamptz,
finish := '2025-07-06 00:30:00+00:00'::timestamptz), -- avoid alias here
m.position_id,m.src_mac_id, m.stream_index, m.measurement_type
ORDER BY
time_bucket_gapfill('5 minutes', m.time, start := '2025-07-05 23:55:00+00:00'::timestamptz,
finish := '2025-07-06 00:30:00+00:00'::timestamptz), -- avoid alias here
m.position_id,m.src_mac_id, m.stream_index, m.measurement_type;
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