Kontinuation commented on issue #2137:
URL: https://github.com/apache/sedona/issues/2137#issuecomment-3105377594
> IN org.apache.sedona.common.Functions.lineMerge when
(merger.getMergedLineStrings().size() > 1) , the output may be multiple
separate linestrings belongs to the merger result, it makes mistake when return
the input geometry :
>
> else { // if the merger couldn't join the lines, it will contain the
individual lines, so return // the input return geometry; }
>
> =>>
>
> else { Object[] mergedlinestrings =
merger.getMergedLineStrings().toArray(new LineString[]{}); MultiLineString
multiLineString = geometry.getFactory().createMultiLineString((LineString[])
mergedlinestrings); return multiLineString; }
Looking at the
[documentation](https://sedona.apache.org/latest/api/sql/Function/?h=st_linemerge#st_linemerge),
the current behavior seems to be intentional.
I think the change you proposed make sense, We can make this behavior change
to be semantically consistent with [ST_LineMerge in
PostGIS](https://postgis.net/docs/ST_LineMerge.html).
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