ST_Split returning NaN coordinates

[strk]

strk=# select ST_AsText(ST_Split( 'LINESTRING(0 1, 0 1, 0 1)', 'POINT(0 1)' ));
                           st_astext                           
---------------------------------------------------------------
 GEOMETRYCOLLECTION(LINESTRING(0 1),LINESTRING(-nan -nan,0 1))
(1 row)

The correct answer may be this one:

strk=# select ST_AsText(ST_Split( 'LINESTRING(0 1, 0 1)', 'POINT(0 1)' ));
                st_astext                
-----------------------------------------
 GEOMETRYCOLLECTION(LINESTRING(0 1,0 1))
(1 row)

[strk]

See #1771 for origin

[strk]

Corollary:

select ST_Line_Locate_Point( 'LINESTRING(0 1, 0 1, 0 1)', 'POINT(0 1)');
 NaN

[strk]

Fixed by r9630 -- to be backported to 1.5 (the ST_Line_Locate_Point part)

[strk]

r9631 is the backport to 1.5