Test for ST_Buffer NPE fix

Upgrading to Esri 2.2.3 included the fix in Esri/geometry-api-java#243
Fixes prestodb#13194

presto-docs/src/main/sphinx/functions/geospatial.rst

@@ -186,7 +186,9 @@ Operations
 .. function:: ST_Buffer(Geometry, distance) -> Geometry
 
     Returns the geometry that represents all points whose distance from the
-    specified geometry is less than or equal to the specified distance.
+    specified geometry is less than or equal to the specified distance.  If the
+    points of the geometry are extremely close together (``delta < 1e-8``), this
+    might return an empty geometry.
 
 .. function:: ST_Difference(Geometry, Geometry) -> Geometry
 

presto-geospatial/src/test/java/com/facebook/presto/plugin/geospatial/TestGeoFunctions.java

@@ -193,6 +193,16 @@ public void testSTBuffer()
         // infinity() and nan() distance
         assertFunction("ST_AsText(ST_Buffer(ST_Point(0, 0), infinity()))", VARCHAR, "MULTIPOLYGON EMPTY");
         assertInvalidFunction("ST_Buffer(ST_Point(0, 0), nan())", "distance is NaN");
+
+        // For small polygons, there was a bug in ESRI that throw an NPE.  This
+        // was fixed (https://github.com/Esri/geometry-api-java/pull/243) to
+        // return an empty geometry instead. Ideally, these would return
+        // something approximately like `ST_Buffer(ST_Centroid(geometry))`.
+        assertFunction("ST_IsEmpty(ST_Buffer(ST_Buffer(ST_Point(177.50102959662, 64.726807421691), 0.0000000001), 0.00005))",
+                BOOLEAN, true);
+        assertFunction("ST_IsEmpty(ST_Buffer(ST_GeometryFromText(" +
+                "'POLYGON ((177.0 64.0, 177.0000000001 64.0, 177.0000000001 64.0000000001, 177.0 64.0000000001, 177.0 64.0))'" +
+                "), 0.01))", BOOLEAN, true);
     }
 
     @Test