CREATE FUNCTION "URX_PUBLIC"."_raster_constraint_info_index"(rastschema name, rasttable name, rastcolumn name) 
 RETURNS boolean AS 
$BODY$
		SELECT
			TRUE
		FROM pg_catalog.pg_class c
		JOIN pg_catalog.pg_index i
			ON i.indexrelid = c.oid
		JOIN pg_catalog.pg_class c2
			ON i.indrelid = c2.oid
		JOIN pg_catalog.pg_namespace n
			ON n.oid = c.relnamespace
		JOIN pg_am am
			ON c.relam = am.oid
		JOIN pg_attribute att
			ON att.attrelid = c2.oid
				AND pg_catalog.format_type(att.atttypid, att.atttypmod) = 'raster'
		WHERE c.relkind IN ('i')
			AND n.nspname = $1
			AND c2.relname = $2
			AND att.attname = $3
			AND am.amname = 'gist'
			AND strpos(pg_catalog.pg_get_expr(i.indexprs, i.indrelid), att.attname) > 0;
	$BODY$
 LANGUAGE 'sql' STABLESTRICT ;