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Set columns to null instead of dropping to avoid pg_deadlock during updates (#1710)

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This PR addresses a pg_deadlock error that would cause an update to fail if a `select getmvt` was queried during update. The deadlock occurred due to an ALTER TABLE DROP COLUMN operation on temporary columns  ( `new_source_ids` and `old_source_ids`) in some linestring tables.

**Changes:**
*  instead of adding/dropping the columns during update, they are now updated and set to NULL. 
* Added new indexes on the source_ids columns  to speed up the UPDATE. 
* Will refresh `osm_park_polygon_dissolve_z4` concurrently in `park_polygon.refresh()` to avoid blocking. 

Co-authored-by: Patrik Sylve <patrik.sylve@t-kartor.com>
This commit is contained in:
Patrik Sylve
2025-02-28 13:27:52 +01:00
committed by GitHub
parent e6a1000155
commit f70ae783b2
4 changed files with 65 additions and 44 deletions
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layers/park/update_park_polygon.sql
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@@ -149,7 +149,7 @@ BEGIN
-- Analyze tracking and source tables before performing update
ANALYZE osm_park_polygon_gen_z4;
REFRESH MATERIALIZED VIEW osm_park_polygon_dissolve_z4;
REFRESH MATERIALIZED VIEW CONCURRENTLY osm_park_polygon_dissolve_z4;
-- noinspection SqlWithoutWhere
DELETE FROM park_polygon.updates;