Function construct_empty_expanded_array

src/backend/utils/adt/arrayfuncs.c:3556–3567

* construct_empty_expanded_array: make an empty expanded array * given only type information. (metacache can be NULL if not needed.) */

 * given only type information.  (metacache can be NULL if not needed.)
 */
ExpandedArrayHeader *
construct_empty_expanded_array(Oid element_type,
							   MemoryContext parentcontext,
							   ArrayMetaState *metacache)
{
	ArrayType  *array = construct_empty_array(element_type);
	Datum		d;

	d = expand_array(PointerGetDatum(array), parentcontext, metacache);
	pfree(array);
	return (ExpandedArrayHeader *) DatumGetEOHP(d);
}

/*
 * deconstruct_array  --- simple method for extracting data from an array