martin/tests/fixtures/function_source_query_params.sql

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DROP FUNCTION IF EXISTS public.function_source_query_params;
CREATE OR REPLACE FUNCTION public.function_source_query_params(z integer, x integer, y integer, query_params json) RETURNS bytea AS $$
DECLARE
mvt bytea;
BEGIN
RAISE DEBUG 'query_params: %', query_params;
IF (query_params->>'token')::varchar IS NULL THEN
RAISE EXCEPTION 'the `token` json parameter does not exist in `query_params`';
END IF;
SELECT INTO mvt ST_AsMVT(tile, 'public.function_source_query_params', 4096, 'geom') FROM (
SELECT
ST_AsMVTGeom(ST_Transform(ST_CurveToLine(geom), 3857), TileBBox(z, x, y, 3857), 4096, 64, true) AS geom
FROM public.table_source
WHERE geom && TileBBox(z, x, y, 4326)
) as tile WHERE geom IS NOT NULL;
RETURN mvt;
END
$$ LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE;