From 136139abab94112e5dc3d1791ed8dbb22032230e Mon Sep 17 00:00:00 2001
From: Kalyan Kanuri <kkalyan@yahoo-inc.com>
Date: Wed, 27 Jul 2016 06:24:46 -0700
Subject: [PATCH] showing NULL

---
 caravel/models.py | 4 ++--
 caravel/viz.py    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/caravel/models.py b/caravel/models.py
index 008a3f0d820b7..4d41716c1311f 100644
--- a/caravel/models.py
+++ b/caravel/models.py
@@ -1410,8 +1410,8 @@ def get_filters(raw_filters):
                         fields.append(Dimension(col) == s)
                     cond = Filter(type="or", fields=fields)
                 else:
-                    #allows setting filter to query that value of dimension is null 
-                    if eq == 'null' or eq == 'NULL':
+                    #allows setting filter to query that value of dimension is NULL 
+                    if eq == 'NULL':
                         eq = None
                     cond = Dimension(col) == eq
                 if op == 'not in':
diff --git a/caravel/viz.py b/caravel/viz.py
index 3259280adb9ea..28ef014d6d829 100755
--- a/caravel/viz.py
+++ b/caravel/viz.py
@@ -177,7 +177,7 @@ def get_df(self, query_obj=None):
                 if self.datasource.offset:
                     df.timestamp += timedelta(hours=self.datasource.offset)
         df.replace([np.inf, -np.inf], np.nan)
-        df = df.fillna(0)
+        df = df.fillna('NULL')
         return df
 
     @property