From 661647bf4892c7017108326a1204c9c253e3f220 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= <motiejus@uber.com>
Date: Fri, 16 Apr 2021 07:31:11 +0300
Subject: [PATCH] construct the polygon only if there are enough points

---
 IV/wm.sql | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/IV/wm.sql b/IV/wm.sql
index 871ee6a..9aebf41 100644
--- a/IV/wm.sql
+++ b/IV/wm.sql
@@ -111,6 +111,7 @@ create or replace function fix_gentle_inflections(
 declare
   len int4;
   bends1 geometry[];
+  dbgpolygon geometry;
 begin
   len = array_length(bends, 1);
 
@@ -133,12 +134,18 @@ begin
         i,
         bends[i]
       );
+
+      dbgpolygon = null;
+      if st_npoints(bends[i]) >= 3 then
+          dbgpolygon = st_makepolygon(st_addpoint(bends[i], st_startpoint(bends[i])));
+      end if;
+
       insert into wm_debug(stage, name, gen, nbend, way) values(
         'cinflections-polygon',
         dbgname,
         dbgstagenum,
         i,
-        st_makepolygon(st_addpoint(bends[i], st_startpoint(bends[i])))
+        dbgpolygon
       );
     end loop;
   end if;