ST_MLineFromWKB(wkb[, srid]), ST_MultiLineStringFromWKB(wkb[, srid])

Constructs a MultiLineString value using its WKB representation and
SRID.

The result is NULL if the WKB or SRID argument is NULL.

URL: http://dev.mysql.com/doc/refman/5.7/en/gis-wkb-functions.html

