Use string templates to build categories CTE sql

lib/cartodb/models/dataview/aggregation.js

@@ -251,37 +251,35 @@ Aggregation.prototype.sql = function(psql, override, callback) {
 };
 
 Aggregation.prototype.getCategoriesCTESql = function(query, column, aggregation, aggregationColumn, isFloatColumn) {
-    return [
-        "WITH",
-        [
-            filteredQueryTpl({
+    return `
+        WITH
+            ${filteredQueryTpl({
                 _isFloatColumn: isFloatColumn,
                 _query: this.query,
                 _column: this.column,
                 _aggregationColumn: aggregation !== 'count' ? aggregationColumn : null
-            }),
-            summaryQueryTpl({
+            })},
+            ${summaryQueryTpl({
                 _isFloatColumn: isFloatColumn,
                 _query: query,
                 _column: column,
                 _aggregationColumn: aggregation !== 'count' ? aggregationColumn : null
-            }),
-            rankedCategoriesQueryTpl({
+            })},
+            ${rankedCategoriesQueryTpl({
                 _query: query,
                 _column: column,
                 _aggregation: this.getAggregationSql(),
                 _aggregationColumn: aggregation !== 'count' ? aggregationColumn : null
-            }),
-            categoriesSummaryMinMaxQueryTpl({
+            })},
+            ${categoriesSummaryMinMaxQueryTpl({
                 _query: query,
                 _column: column
-            }),
-            categoriesSummaryCountQueryTpl({
+            })},
+            ${categoriesSummaryCountQueryTpl({
                 _query: query,
                 _column: column
-            })
-        ].join(',\n')
-    ].join('\n');
+            })}
+    `;
 };
 
 const aggregationFnQueryTpl = ctx => `${ctx._aggregationFn}(${ctx._aggregationColumn})`;