PG_FUNCTION_INFO_V1() [12/23]

PG_FUNCTION_INFO_V1

(

LWGEOM_interiorringn_polygon

)

InteriorRingN(GEOMETRY) – find the first polygon in GEOMETRY, Index is 1-based.

Returns

its Nth interior ring (as a linestring). Return NULL if there is no POLYGON(..) in (first level of) GEOMETRY.