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PostGIS 1.5.8 Manual223 / 310DescriptionThis set-returning function (SRF) returns a set of geometry_dump rows formed by a geometry (geom) and an array of integers(path).The geom component of geometry_dump are all the POINTs that make up the supplied geometryThe path component of geometry_dump (an integer[]) is an index reference enumerating the POINTs of the suppliedgeometry. For example, if a LINESTRING is supplied, a path of {i} is returned where i is the nth coordinate in the LIN-ESTRING. If a POLYGON is supplied, a path of {i,j} is returned where i is the outer ring followed by the inner rings and jenumerates the POINTs.Availability: 1.5.0This function supports 3d and will not drop the z-index.This method supports Circular Strings and CurvesExamplesSELECT path, ST_AsText(geom)FROM (SELECT (ST_DumpPoints(g.geom)).*FROM(SELECT’GEOMETRYCOLLECTION(POINT ( 0 1 ),LINESTRING ( 0 3, 3 4 ),POLYGON (( 2 0, 2 3, 0 2, 2 0 )),POLYGON (( 3 0, 3 3, 6 3, 6 0, 3 0 ),( 5 1, 4 2, 5 2, 5 1 )),MULTIPOLYGON ((( 0 5, 0 8, 4 8, 4 5, 0 5 ),( 1 6, 3 6, 2 7, 1 6 )),(( 5 4, 5 8, 6 7, 5 4 ))))’::geometry AS geom) AS g) j;