* All functions that access database must be declared as `STABLE`, not `IMMUTABLE` -- because database can change at any moment, e.g. during an update
* there are a few functions that could be made `STRICT` -- passing `NULL` as a parameter will always result in a `NULL`, but for some reason that causes a significant decrease in perf.
* tagged one function as parallel safe
NOTE: somehow `ST_AsMVT()` method of tile generation is showing 70-90% slowdown with this patch. I am not sure of why this is happening. If the reason is the `IMMUTABLE` -> `STABLE` change, we may have to dig deeper into PG optimization
I would like to reformat all of our SQL to have a concise coding style.
This makes it far easier to understand the code for a casual contributor,
and lets us spot errors more easily.
Most importantly, it makes it much easier to grep (search) the code because it is more likely to be in the same syntax
Some key changes:
* SQL keywords are always UPPERCASE, e.g. `SELECT WHEN AS END ...`
* types, variables, aliases, and field names (identifiers) are always lower case
* `LANGUAGE 'plpgsql'` is now `LANGUAGE plpgsql` (no quotes)
* a few minor spacing/semicolon cleanups
P.S. Per @TomPohys request, `TABLE` is spelled using upper case despite being a type for consistency with PG Docs. Same for `LANGUAGE SQL` vs `LANGUAGE plpgsql`.
Change the feature_id of objects in the tiles from arbitrary number to osm_id.
From discussion here https://github.com/openmaptiles/openmaptiles/pull/725#issuecomment-619059931
Note the multiploygon building are load with negative relation osm_id. But the use in feature_id do an overflow (eg -7980888 -> 18446744073701570000). We can keep as is or not.
No stats done for yet. Trying to let the CI do it.
`nullif(as_numeric(height),-1)` is doing a double conversion -- null into -1 followed by -1 back into null. Remove that, and delete unused `as_numeric`
layer_building uses osm_all_buildings, which uses a
non-parallel-safe as_numeric. Marking it as non-parallel safe
for now until we switch to CleanNumeric later.
Replacing materialized view by a tables with update from trigger on change only.
Start with the most simple cases.
Just replicate the change on:
* `osm_water_polygon` to `osm_water_lakeline`,
* `osm_water_polygon` to `osm_water_point`.
Use a view to factorize the `osm_water_lakeline` and `osm_water_point_view` definition and reuse it in the trigger.
The update of `osm_important_waterway_linestring` is more complex, as it is a merge of `osm_waterway_linestring`. It not done in the same way. At the end of the transaction we remove impacted and recompute them.
The goal is to update more quickly the content of derivated table by just updating the changing content. It replaces the update of materialized view because their need a full recompute (with lock issue).
Note, an advanced version of differential update over materialized view as already implemented in the building cluster PR #725.
It addresses #814 and a part of #809.
Update to tools v5. See https://github.com/openmaptiles/openmaptiles-tools/releases/tag/v5.0.0 for the list of all changes. Other OMT-repo specific changes:
* removes `import-osm` docker usage, replacing it with `openmaptiles-tools`
* quickstart builds faster because it uses postgres with preloaded water, natural earth, and lake centerlines tables.
### Makefile targets
* `tools-dev` will open a shell in a docker to experiment and debug (instead of `import-sql-dev` and `import-osm-dev`)
* separated `start-maputnik` from `start-postserve`
* renamed `clean-docker` into `db-destroy` to make it more explicit
* cleaner `db-start`, `db-stop`, `db-destroy` targets
* `db-start-preloaded` is the same as `db-start`, except that it uses `postgis-preloaded` -- an image with preloaded water, natural-earth, and lake centerline data
* `db-start` will not recreate the container if it already exists -- this way if it was started as preloaded, it will not be rebuilt.
* better output messages
### Quickstart
* uses `postgis-preloaded` image by default to make quickstart quicker. To start with a clean db, pass 2 parameters to quickstart, e.g. `./quickstart.sh albania empty`
Build on top of PR #755, to be merged first.
Since we want every thing from osm_building_polygon (osm_id >= 0 and osm_id < 0), we can merge the two queries.
Note: the obp.osm_id >= 0 on the left join only apply to the left join part.
