Compensate for bbox lack of accuracy

lib/cartodb/models/aggregation/aggregation-query.js

@@ -274,20 +274,23 @@ const spatialFilter = `
 // * This queries are used for rendering and the_geom is omitted in the results for better performance
 // * If the MVT extent or tile buffer was 0 or a multiple of the resolution we could use directly
 //   the bbox for them, but in general we need to find the nearest cell limits inside the bbox.
+// * bbox coordinates can have an error in the last digites; we apply a small correction before
+//   applying CEIL or FLOOR to compensate for this.
 const sqlParams = (ctx) => `
 _cdb_res AS (
     SELECT
     ${gridResolution(ctx)} AS res,
-    !bbox! AS bbox
+    !bbox! AS bbox,
+    (2*2.220446049250313e-16::double precision) AS eps
 ),
 _cdb_params AS (
     SELECT
       res,
       bbox,
-      CEIL(ST_XMIN(bbox)/res)*res AS xmin,
-      FLOOR(ST_XMAX(bbox)/res)*res AS xmax,
-      CEIL(ST_YMIN(bbox)/res)*res AS ymin,
-      FLOOR(ST_YMAX(bbox)/res)*res AS ymax
+      CEIL((ST_XMIN(bbox) - eps*ABS(ST_XMIN(bbox)))/res)*res AS xmin,
+      FLOOR((ST_XMAX(bbox) + eps*ABS(ST_XMAX(bbox)))/res)*res AS xmax,
+      CEIL((ST_YMIN(bbox) - eps*ABS(ST_YMIN(bbox)))/res)*res AS ymin,
+      FLOOR((ST_YMAX(bbox) + eps*ABS(ST_YMAX(bbox)))/res)*res AS ymax
       FROM _cdb_res
 )
 `;

test/acceptance/aggregation.js

@@ -2455,7 +2455,7 @@ describe('aggregation', function () {
                     });
                 });
 
-                it.skip(`for ${placement} points aggregated into corner cluster`, function (done) {
+                it(`for ${placement} points aggregated into corner cluster`, function (done) {
                     // this test will fail due to !bbox! lack of accuracy if strict cell filtering is in place
                     this.mapConfig = {
                         version: '1.6.0',