From 44a5483b5085ada64bb7d9c587557fbba2be014c Mon Sep 17 00:00:00 2001
From: Chad Huntley <chadhuntley@gmail.com>
Date: Thu, 26 Jul 2018 23:01:31 -0700
Subject: [PATCH] Fixed out of memory issue with array concat

---
 packages/gatsby/src/schema/data-tree-utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/gatsby/src/schema/data-tree-utils.js b/packages/gatsby/src/schema/data-tree-utils.js
index d53a33be41384..fae402fd49c24 100644
--- a/packages/gatsby/src/schema/data-tree-utils.js
+++ b/packages/gatsby/src/schema/data-tree-utils.js
@@ -163,7 +163,7 @@ const extractFromEntries = (
     return getExampleScalarFromArray(values)
   } else if (_.isObject(exampleValue)) {
     if (Array.isArray(exampleValue)) {
-      const concatanedItems = [].concat(...values)
+      const concatanedItems = _.flatten(values)
       // Linked node arrays don't get reduced further as we
       // want to preserve all the linked node types.
       if (key.includes(`___NODE`)) {