ST_Split using MULTILINESTRING blade

[mwtoews]

Attempting to split a POLYGON with a MULTILINESTRING in PostGIS 2.1 yields an error:

SELECT ST_AsText(ST_Split(poly, blade))
FROM (
  SELECT
    'POLYGON((20 30, 100 180, 160 20, 20 30),(70 70, 92 105, 110 50, 70 70))'::geometry poly,
    'MULTILINESTRING((150 90, 90 70, 60 20),(50 140, 90 70))'::geometry blade
) f;

ERROR:  Splitting a Polygon by a MultiLineString is unsupported

This enhancement is to allow ST_Split to allow a MULTILINESTRING as a blade.

See UsersWikiSplitPolygonWithLineString for a ST_SplitPolygon which can complete the above example as expected.

[strk]

Implemented with r13433, thanks Regione Toscana!

[WS90]

Hello,

I'm working on Postgis "2.3 USE_GEOS=1 USE_PROJ=1 USE_STATS=1" and when I execute the following request :

SELECT ST_AsText(ST_Split(poly, blade))
FROM (
  SELECT
    'POLYGON((20 30, 100 180, 160 20, 20 30),(70 70, 92 105, 110 50, 70 70))'::geometry poly,
    'MULTILINESTRING((150 90, 90 70, 60 20),(50 140, 90 70))'::geometry blade
) f;

I get the error : "Splitting a Polygon by a MultiLineString is unsupported"

[pramsey]

Confirmed on trunk as well. The referenced patch covered a number of cases, but not the case in this actual ticket.

[pramsey]

In 16127:

Allow multi-linestring to be used as blade in line/poly splitting,
References #3097

[robe]

pramsey sorry to be such a nag.

Don't forget the NEWS item and Enhanced: note in docs. I reopened ticket for that cause I'm so petty.

[pramsey]

In 16128:

Doco on "enhancement" per robe, closes #3097

[pramsey]

In 16129:

Clarify docs, References #3097