Add function to drop the osm chunk

sql/chunk.sql

@@ -75,3 +75,9 @@ CREATE OR REPLACE FUNCTION _timescaledb_functions.attach_osm_table_chunk(
    hypertable REGCLASS,
    chunk REGCLASS)
 RETURNS BOOL AS '@MODULE_PATHNAME@', 'ts_chunk_attach_osm_table_chunk' LANGUAGE C VOLATILE;
+
+-- internal API used by OSM extension to drop an OSM chunk table from the hypertable
+CREATE OR REPLACE FUNCTION _timescaledb_functions.drop_osm_table_chunk(
+   hypertable REGCLASS,
+   chunk REGCLASS)
+RETURNS BOOL AS '@MODULE_PATHNAME@', 'ts_chunk_drop_osm_table_chunk' LANGUAGE C VOLATILE;

sql/updates/latest-dev.sql

@@ -329,3 +329,8 @@ ANALYZE _timescaledb_catalog.continuous_agg;
 --
 -- END Rebuild the catalog table `_timescaledb_catalog.continuous_agg`
 --
+
+CREATE FUNCTION _timescaledb_functions.drop_osm_table_chunk(
+   hypertable REGCLASS,
+   chunk REGCLASS)
+RETURNS BOOL AS '@MODULE_PATHNAME@', 'ts_chunk_drop_osm_table_chunk' LANGUAGE C VOLATILE;

sql/updates/reverse-dev.sql

@@ -206,4 +206,4 @@ CREATE FUNCTION _timescaledb_functions.get_chunk_colstats(relid REGCLASS)
 RETURNS TABLE(chunk_id INTEGER, hypertable_id INTEGER, att_num INTEGER, nullfrac REAL, width INTEGER, distinctval REAL, slotkind INTEGER[], slotopstrings CSTRING[], slotcollations OID[], slot1numbers FLOAT4[], slot2numbers FLOAT4[], slot3numbers FLOAT4[], slot4numbers FLOAT4[], slot5numbers FLOAT4[], slotvaluetypetrings CSTRING[], slot1values CSTRING[], slot2values CSTRING[], slot3values CSTRING[], slot4values CSTRING[], slot5values CSTRING[])
 AS $$BEGIN END$$ LANGUAGE plpgsql SET search_path = pg_catalog, pg_temp;
 
-
+DROP FUNCTION IF EXISTS _timescaledb_functions.drop_osm_table_chunk(REGCLASS, REGCLASS);

src/chunk.c

@@ -80,6 +80,7 @@ TS_FUNCTION_INFO_V1(ts_chunk_id_from_relid);
 TS_FUNCTION_INFO_V1(ts_chunk_show);
 TS_FUNCTION_INFO_V1(ts_chunk_create);
 TS_FUNCTION_INFO_V1(ts_chunk_status);
+TS_FUNCTION_INFO_V1(ts_chunk_drop_osm_table_chunk);
 
 static bool ts_chunk_add_status(Chunk *chunk, int32 status);
 
@@ -5189,3 +5190,30 @@ get_chunks_in_creation_time_range(Hypertable *ht, int64 older_than, int64 newer_
 
 	return chunks;
 }
+
+
+Datum
+ts_chunk_drop_osm_table_chunk(PG_FUNCTION_ARGS)
+{
+	Oid hypertable_relid = PG_ARGISNULL(0) ? InvalidOid : PG_GETARG_OID(0);
+	Cache *hcache = ts_hypertable_cache_pin();
+	Hypertable *ht = ts_resolve_hypertable_from_table_or_cagg(hcache, hypertable_relid, true);
+
+	Oid chunk_relid = PG_ARGISNULL(1) ? InvalidOid : PG_GETARG_OID(1);
+	char *chunk_table_name = get_rel_name(chunk_relid);
+	char *chunk_schema_name = get_namespace_name(get_rel_namespace(chunk_relid));
+
+	const Chunk *ch = ts_chunk_get_by_name_with_memory_context(chunk_schema_name,
+															   chunk_table_name,
+															   CurrentMemoryContext,
+															   true);
+	Assert(ch != NULL);
+	ts_chunk_validate_chunk_status_for_operation(ch, CHUNK_DROP, true /*throw_error */);
+	/* do not drop any chunk dependencies */
+	ts_chunk_drop(ch, DROP_RESTRICT, LOG);
+	/* reset hypertable OSM status */
+	ht->fd.status = HYPERTABLE_STATUS_DEFAULT;
+	ts_hypertable_update(ht);
+	ts_cache_release(hcache);
+	PG_RETURN_BOOL(true);
+}

tsl/test/shared/expected/extension.out

@@ -60,6 +60,7 @@ ORDER BY pronamespace::regnamespace::text COLLATE "C", p.oid::regprocedure::text
  _timescaledb_functions.dimension_info_in(cstring)
  _timescaledb_functions.dimension_info_out(_timescaledb_internal.dimension_info)
  _timescaledb_functions.drop_chunk(regclass)
+ _timescaledb_functions.drop_osm_table_chunk(regclass,regclass)
  _timescaledb_functions.finalize_agg(text,name,name,name[],bytea,anyelement)
  _timescaledb_functions.finalize_agg_ffunc(internal,text,name,name,name[],bytea,anyelement)
  _timescaledb_functions.finalize_agg_sfunc(internal,text,name,name,name[],bytea,anyelement)