MDEV-11881 Empty coordinates must be rejected in GeoJSON objects.

        Check for the empty 'coordinates' array.

mysql-test/r/gis-json.result

@@ -89,6 +89,21 @@ ST_AsGeoJSON(ST_GeomFromText("POINT(10 11)"), 100, 1)
 SELECT ST_AsGeoJSON(ST_GeomFromText("POINT(10 11)"), 100, 5);
 ST_AsGeoJSON(ST_GeomFromText("POINT(10 11)"), 100, 5)
 {"bbox": [10, 11, 10, 11], "type": "Point", "coordinates": [10, 11]}
+SELECT st_astext(st_geomfromgeojson('{"type": "MultiLineString","coordinates": []}')) as a;
+a
+NULL
+Warnings:
+Warning	4076	Incorrect GeoJSON format - empty 'coordinates' array.
+SELECT st_astext(st_geomfromgeojson('{"type": "Polygon","coordinates": []}')) as a;
+a
+NULL
+Warnings:
+Warning	4076	Incorrect GeoJSON format - empty 'coordinates' array.
+SELECT st_astext(st_geomfromgeojson('{"type": "MultiPolygon","coordinates": []}')) as a;
+a
+NULL
+Warnings:
+Warning	4076	Incorrect GeoJSON format - empty 'coordinates' array.
 #
 # End of 10.2 tests
 #

mysql-test/t/gis-json.test

@@ -40,6 +40,10 @@ SELECT ST_AsGeoJSON(ST_GeomFromText('POINT(5.363 7.266)'),10);
 SELECT ST_AsGeoJSON(ST_GeomFromText("POINT(10 11)"), 100, 1);
 SELECT ST_AsGeoJSON(ST_GeomFromText("POINT(10 11)"), 100, 5);
 
+SELECT st_astext(st_geomfromgeojson('{"type": "MultiLineString","coordinates": []}')) as a;
+SELECT st_astext(st_geomfromgeojson('{"type": "Polygon","coordinates": []}')) as a;
+SELECT st_astext(st_geomfromgeojson('{"type": "MultiPolygon","coordinates": []}')) as a;
+
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/item_geofunc.cc

@@ -174,6 +174,9 @@ String *Item_func_geometry_from_json::val_str(String *str)
     case Geometry::GEOJ_TOO_FEW_POINTS:
       code= ER_GEOJSON_TOO_FEW_POINTS;
       break;
+    case Geometry::GEOJ_EMPTY_COORDINATES:
+      code= ER_GEOJSON_EMPTY_COORDINATES;
+      break;
     case Geometry::GEOJ_POLYGON_NOT_CLOSED:
       code= ER_GEOJSON_NOT_CLOSED;
       break;

sql/share/errmsg-utf8.txt

@@ -7746,3 +7746,6 @@ ER_SUM_FUNC_WITH_WINDOW_FUNC_AS_ARG
 
 ER_NET_OK_PACKET_TOO_LARGE
   eng "OK packet too large"
+
+ER_GEOJSON_EMPTY_COORDINATES
+        eng "Incorrect GeoJSON format - empty 'coordinates' array."

sql/spatial.cc

@@ -1041,7 +1041,7 @@ bool Gis_line_string::init_from_json(json_engine_t *je, bool er_on_3D,
   }
   if (n_points < 1)
   {
-    je->s.error= GEOJ_TOO_FEW_POINTS;
+    je->s.error= Geometry::GEOJ_TOO_FEW_POINTS;
     return TRUE;
   }
   wkb->write_at_position(np_pos, n_points);
@@ -1440,6 +1440,15 @@ bool Gis_polygon::init_from_json(json_engine_t *je, bool er_on_3D, String *wkb)
     }
     n_linear_rings++;
   }
+
+  if (je->s.error)
+    return TRUE;
+
+  if (n_linear_rings == 0)
+  {
+    je->s.error= Geometry::GEOJ_EMPTY_COORDINATES;
+    return TRUE;
+  }
   wkb->write_at_position(lr_pos, n_linear_rings);
   return FALSE;
 }
@@ -1945,6 +1954,14 @@ bool Gis_multi_point::init_from_json(json_engine_t *je, bool er_on_3D,
     n_points++;
   }
 
+  if (je->s.error)
+    return TRUE;
+  if (n_points == 0)
+  {
+    je->s.error= Geometry::GEOJ_EMPTY_COORDINATES;
+    return TRUE;
+  }
+
   wkb->write_at_position(np_pos, n_points);
   return FALSE;
 }
@@ -2214,6 +2231,15 @@ bool Gis_multi_line_string::init_from_json(json_engine_t *je, bool er_on_3D,
 
     n_line_strings++;
   }
+  if (je->s.error)
+    return TRUE;
+
+  if (n_line_strings == 0)
+  {
+    je->s.error= Geometry::GEOJ_EMPTY_COORDINATES;
+    return TRUE;
+  }
+
   wkb->write_at_position(ls_pos, n_line_strings);
   return FALSE;
 }
@@ -2603,6 +2629,13 @@ bool Gis_multi_polygon::init_from_json(json_engine_t *je, bool er_on_3D,
 
     n_polygons++;
   }
+  if (je->s.error)
+    return TRUE;
+  if (n_polygons == 0)
+  {
+    je->s.error= Geometry::GEOJ_EMPTY_COORDINATES;
+    return TRUE;
+  }
   wkb->write_at_position(np_pos, n_polygons);
   return FALSE;
 }

sql/spatial.h

@@ -256,6 +256,7 @@ class Geometry
     GEOJ_TOO_FEW_POINTS= 2,
     GEOJ_POLYGON_NOT_CLOSED= 3,
     GEOJ_DIMENSION_NOT_SUPPORTED= 4,
+    GEOJ_EMPTY_COORDINATES= 5,
   };