From f9c8ca5df2457a541f70923a406719c3706c9d6d Mon Sep 17 00:00:00 2001
From: Erik Ritter <erik.ritter@airbnb.com>
Date: Sun, 2 Feb 2020 09:13:25 -0800
Subject: [PATCH] [SQL Lab] Improve autocomplete performance (#9064)

---
 superset/assets/src/SqlLab/components/AceEditorWrapper.jsx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/superset/assets/src/SqlLab/components/AceEditorWrapper.jsx b/superset/assets/src/SqlLab/components/AceEditorWrapper.jsx
index 3c2101e1b..aa31827d6 100644
--- a/superset/assets/src/SqlLab/components/AceEditorWrapper.jsx
+++ b/superset/assets/src/SqlLab/components/AceEditorWrapper.jsx
@@ -155,7 +155,12 @@ class AceEditorWrapper extends React.PureComponent {
         });
       },
     };
-    const words = this.state.words.map(word => ({ ...word, completer }));
+    // Mutate instead of object spread here for performance
+    const words = this.state.words.map(word => {
+      /* eslint-disable-next-line no-param-reassign */
+      word.completer = completer;
+      return word;
+    });
     callback(null, words);
   }
   setAutoCompleter(props) {