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The following commit(s) were added to refs/heads/master by this push:
     new d2d9731  Unset 'series limit' default from 50 to null (#4410)
d2d9731 is described below

commit d2d973153f2efc9e64420d295f1d61dc02fc5867
Author: Maxime Beauchemin <>
AuthorDate: Tue Feb 13 11:17:19 2018 -0800

    Unset 'series limit' default from 50 to null (#4410)
    Setting "Series Limit" by default results in a subquery (or 2 phase)
    which can be suboptimal / unecessary where low cardinality dims
    are used.
 superset/assets/javascripts/explore/stores/controls.jsx | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/superset/assets/javascripts/explore/stores/controls.jsx 
index e8a34d9..007523c 100644
--- a/superset/assets/javascripts/explore/stores/controls.jsx
+++ b/superset/assets/javascripts/explore/stores/controls.jsx
@@ -870,8 +870,11 @@ export const controls = {
     label: t('Series limit'),
     validators: [v.integer],
     choices: formatSelectOptions(SERIES_LIMITS),
-    default: 50,
-    description: t('Limits the number of time series that get displayed'),
+    description: t(
+      'Limits the number of time series that get displayed. A sub query ' +
+      '(or an extra phase where sub queries are not supported) is applied to 
limit ' +
+      'the number of time series that get fetched and displayed. This feature 
is useful ' +
+      'when grouping by high cardinality dimension(s).'),
   timeseries_limit_metric: {

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