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https://github.com/maplibre/martin.git
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b3fb720a94
If a PostgreSQL function has an SQL comment, it will try to parse as
JSON and use its values to override the auto-generated TileJSON. It is
recommended to use this form when creating comments to ensure valid JSON
values.
```sql
DO $do$ BEGIN
EXECUTE 'COMMENT ON FUNCTION YOUR_FUNCTION (ARG1_TYPE,ARG2_TYPE,..ARGN_TYPE) IS $tj$' || $$
{
"description": "description override",
...
}
$$::json || '$tj$';
END $do$;
```
Partially implements #822
28 lines
851 B
PL/PgSQL
28 lines
851 B
PL/PgSQL
DROP FUNCTION IF EXISTS public.function_zxy_query;
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CREATE OR REPLACE FUNCTION public.function_zxy_query(z integer, x integer, y integer, query json) RETURNS bytea AS $$
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DECLARE
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mvt bytea;
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BEGIN
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RAISE NOTICE 'query: %', query;
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SELECT INTO mvt ST_AsMVT(tile, 'public.function_zxy_query', 4096, 'geom') FROM (
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SELECT
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ST_AsMVTGeom(ST_Transform(ST_CurveToLine(geom), 3857), ST_TileEnvelope(z, x, y), 4096, 64, true) AS geom
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FROM public.table_source
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WHERE geom && ST_Transform(ST_TileEnvelope(z, x, y), 4326)
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) as tile WHERE geom IS NOT NULL;
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RETURN mvt;
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END
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$$ LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE;
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DO $do$ BEGIN
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EXECUTE 'COMMENT ON FUNCTION public.function_zxy_query (INT4, INT4, INT4, JSON) IS $tj$' || $$
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{
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"description": null,
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"foo": {"bar": "foo"}
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}
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$$::json || '$tj$';
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END $do$;
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