describe behaviour in case of LineStrings

2021-09-23 11:56:05 -07:00
1 changed files with 3 additions and 0 deletions
--- a/doc/reference_overlay.xml
+++ b/doc/reference_overlay.xml
@ -974,6 +974,9 @@ on that same grid. (Requires GEOS-3.9.0 or higher)
        </para></note>

    <para>Performed by the GEOS module.</para>
+    <para>ST_Union creates MultiLineString and does not sew LineStrings into a single LineString.
+        Use <xref linkend="ST_LineMerge" /> to sew LineStrings.</para>
+        
    <para>NOTE: this function was formerly called GeomUnion(), which
        was renamed from "Union" because UNION is an SQL reserved
        word.</para>