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I try to split a line into 2m segments but somehow the function ST_SEGMENTIZE returns the whole line assigning just one id.

An example:

CREATE TABLE line(name char(10), geom geometry);


INSERT INTO line VALUES('line','SRID=32637;LINESTRING(1 1, 1 3, 2 3, 3 3, 3 2, 4 2, 5 3)');


SELECT ROW_NUMBER() OVER() AS id, ST_AsText(ST_SEGMENTIZE(geom, 2)) AS geom FROM line;

Output:

id  geom
1   LINESTRING(1 1,1 3,2 3,3 3,3 2,4 2,5 3)

How can I achieve to get 2m segments from my line-input using PostGIS 2.5.1?

1

ST_Segmentize will not split the input, it will add vertices to the original geometry so that the distance between vertices is the specified distance.

You may be looking for ST_LineSubstring instead, like in this answer

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