Fix to issue 2524 by limiting number of returned measurements for display. (#8092)

public/app/plugins/datasource/influxdb/query_builder.js

@@ -91,7 +91,13 @@ function (_) {
         query +=  ' WHERE ' + whereConditions.join(' ');
       }
     }
-
+    if (type === 'MEASUREMENTS')
+    {
+      query += ' LIMIT 100';
+      //Solve issue #2524 by limiting the number of measurements returned
+      //LIMIT must be after WITH MEASUREMENT and WHERE clauses
+      //This also could be used for TAG KEYS and TAG VALUES, if desired
+    }
     return query;
   };
 

public/app/plugins/datasource/influxdb/specs/query_builder_specs.ts

@@ -34,31 +34,31 @@ describe('InfluxQueryBuilder', function() {
     it('should have no conditions in measurement query for query with no tags', function() {
       var builder = new InfluxQueryBuilder({ measurement: '', tags: [] });
       var query = builder.buildExploreQuery('MEASUREMENTS');
-      expect(query).to.be('SHOW MEASUREMENTS');
+      expect(query).to.be('SHOW MEASUREMENTS LIMIT 100');
     });
 
     it('should have no conditions in measurement query for query with no tags and empty query', function() {
       var builder = new InfluxQueryBuilder({ measurement: '', tags: [] });
       var query = builder.buildExploreQuery('MEASUREMENTS', undefined, '');
-      expect(query).to.be('SHOW MEASUREMENTS');
+      expect(query).to.be('SHOW MEASUREMENTS LIMIT 100');
     });
 
     it('should have WITH MEASUREMENT in measurement query for non-empty query with no tags', function() {
       var builder = new InfluxQueryBuilder({ measurement: '', tags: [] });
       var query = builder.buildExploreQuery('MEASUREMENTS', undefined, 'something');
-      expect(query).to.be('SHOW MEASUREMENTS WITH MEASUREMENT =~ /something/');
+      expect(query).to.be('SHOW MEASUREMENTS WITH MEASUREMENT =~ /something/ LIMIT 100');
     });
 
     it('should have WITH MEASUREMENT WHERE in measurement query for non-empty query with tags', function() {
           var builder = new InfluxQueryBuilder({ measurement: '', tags: [{key: 'app', value: 'email'}] });
           var query = builder.buildExploreQuery('MEASUREMENTS', undefined, 'something');
-          expect(query).to.be("SHOW MEASUREMENTS WITH MEASUREMENT =~ /something/ WHERE \"app\" = 'email'");
+          expect(query).to.be("SHOW MEASUREMENTS WITH MEASUREMENT =~ /something/ WHERE \"app\" = 'email' LIMIT 100");
     });
 
     it('should have where condition in measurement query for query with tags', function() {
       var builder = new InfluxQueryBuilder({measurement: '', tags: [{key: 'app', value: 'email'}]});
       var query = builder.buildExploreQuery('MEASUREMENTS');
-      expect(query).to.be("SHOW MEASUREMENTS WHERE \"app\" = 'email'");
+      expect(query).to.be("SHOW MEASUREMENTS WHERE \"app\" = 'email' LIMIT 100");
     });
 
     it('should have where tag name IN filter in tag values query for query with one tag', function() {