COMPASS-3498: Handle in range queries

Author: durran

lib/inValueRange.js

@@ -47,6 +47,9 @@ const inValueRange = (field, d) => {
     },
     $exists: function(a, b) {
       return (a || b);
+    },
+    $eq: function(a, b) {
+      return a === b;
     }
   };
 

test/inValueRange.test.js

@@ -270,6 +270,20 @@ describe('inValueRange [Util]', () => {
     });
   });
 
+  describe('ranges with $eq', () => {
+    beforeEach(() => {
+      query = {$eq: 5};
+    });
+
+    it('should detect a match for a range', () => {
+      expect(inValueRange(query, {value: 5, dx: 5})).to.equal('partial');
+    });
+
+    it('should detect a match for single value', () => {
+      expect(inValueRange(query, {value: 10, dx: 0})).to.equal('no');
+    });
+  });
+
   describe('non-numeric types', () => {
     it('should work for dates', () => {
       query = {$gte: new Date('2011-01-01'), $lte: new Date('2013-01-01')};