ST_Line_Interpolate_Point doesn't interpolate M-values

[rkail]

the documentation of ST_Line_Interpolate_Point states that "this function also interpolates M and Z values ".

using the sample from the manual:

SELECT ST_AsEWKT(ST_Line_Interpolate_Point(the_line, 0.5))
FROM (SELECT ST_GeomFromEWKT('LINESTRING(1 2 3, 4 5 6, 6 7 8)')
as the_line) As foo;

st_asewkt
POINT(3.5 4.5 5.5)

is working. Using M-values:

SELECT ST_AsEWKT(ST_Line_Interpolate_Point(the_line, 0.5))
FROM (SELECT ST_GeomFromEWKT('LINESTRINGM(1 2 3, 4 5 6, 6 7 8)')
 as the_line) As foo;

st_asewkt
POINTM(3.5 4.5 0)

returns 0 as m-value.

btw, ST_Line_SubString works as expected, even if start and end have the same value.

[pramsey]

I think this was already fixed for 1.4 and 1.5 in ticket #1120. It's now also fixed in trunk (don't know how I missed that) at r8986