@leijurv commented on this pull request.
> + // endpoint equality, not ST_Intersects, to avoid deleting unrelated
+ // same-group lines that cross a component. A second pass over the changed
+ // region cleans up outputs of components that disappeared entirely (all
+ // their lines deleted), which leave no reached nodes behind; that pass is
+ // self-correcting because anything it removes either vanished or has a
+ // surviving line in the region and is regenerated below.
+ timer(m_timer_delete).start();
+ auto deleted = dbexec(R"(
+DELETE FROM {dest} d
+ USING _glm_nodes n
+ WHERE {group_join_dn}
+ AND ( (ST_X(ST_StartPoint(d."{geom_column}")) = n.x
+ AND ST_Y(ST_StartPoint(d."{geom_column}")) = n.y)
+ OR (ST_X(ST_EndPoint(d."{geom_column}")) = n.x
+ AND ST_Y(ST_EndPoint(d."{geom_column}")) = n.y) )
+)");
The point is that if all I know is "something happened in this tile", I will
explore every network of ways, some of which have changed, most of which
haven't, but I don't know the difference.
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