Fix ANALYZE crash with custom types

Extensions like PostGIS introduce custom datatypes for columns. They
also have custom statistics for such custom types. We already state in
our comments that stats for custom types are not supported but it was
never tested. Fix that now.

Fixes #3733

tsl/src/chunk_api.c

@@ -757,7 +757,14 @@ collect_colstat_slots(const HeapTuple tuple, const Form_pg_statistic formdata, D
 		slot_collation[i] = ObjectIdGetDatum(((Oid *) &formdata->stacoll1)[i]);
 
 		slotkind[i] = ObjectIdGetDatum(kind);
-		if (kind == InvalidOid)
+
+		/*
+		 * As per comments in pg_statistic_d.h, "kind" codes from 0 - 99 are reserved
+		 * for assignment by the core PostgreSQL project. Beyond that are for PostGIS
+		 * and other projects
+		 */
+#define PG_STATS_KINDS_MAX 99
+		if (kind == InvalidOid || kind > PG_STATS_KINDS_MAX)
 		{
 			nulls[numbers_idx] = true;
 			nulls[values_idx] = true;
@@ -1175,7 +1182,12 @@ chunk_process_remote_colstats_row(StatsProcessContext *ctx, TupleFactory *tf, Tu
 		value_arrays[i] = NULL;
 		valtype_oids[i] = InvalidOid;
 
-		if (slot_kinds[i] == InvalidOid)
+		/*
+		 * As per comments in pg_statistic_d.h, "kind" codes from 0 - 99 are reserved
+		 * for assignment by the core PostgreSQL project. Beyond that are for PostGIS
+		 * and other projects
+		 */
+		if (slot_kinds[i] == InvalidOid || slot_kinds[i] > PG_STATS_KINDS_MAX)
 			continue;
 
 		for (k = 0; k < STRINGS_PER_OP_OID; ++k)