From 8a1d5d3a489cc26e94a4c181f99c64f33adea303 Mon Sep 17 00:00:00 2001
From: Javier Goizueta <jgoizueta@gmail.com>
Date: Mon, 28 May 2018 17:36:58 +0200
Subject: [PATCH] Be careful and detect type invalid types

---
 lib/cartodb/utils/query-utils.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/cartodb/utils/query-utils.js b/lib/cartodb/utils/query-utils.js
index ae1a2e2d..867db0cd 100644
--- a/lib/cartodb/utils/query-utils.js
+++ b/lib/cartodb/utils/query-utils.js
@@ -92,10 +92,13 @@ function columnSelector(columns) {
     if (!columns) {
         return '*';
     }
-    if (typeof(columns) === 'string') {
+    if (typeof columns === 'string') {
         return columns;
     }
-    return columns.map(name => `"${name}"`).join(', ');
+    if (Array.isArray(columns)) {
+        return columns.map(name => `"${name}"`).join(', ');
+    }
+    throw new TypeError(`Bad argument type for columns: ${typeof columns}`);
 }
 
 module.exports.getQuerySample = function(query, sampleProb, limit = null, randomSeed = 0.5, columns = null) {