Fix query aliases

lib/cartodb/models/dataview/histogram.js

@@ -134,7 +134,7 @@ var infinitiesQueryTpl = dot.template([
     '__cdb_infinities AS (',
     '  SELECT',
     '    count(*) AS infinities_count',
-    '  FROM ({{=it._query}}) _cdb_histogram_infinities',
+    '  FROM ({{=it._query}}) __cdb_infinities_query',
     '  WHERE',
     '    {{=it._column}} = \'infinity\'::float',
     '  OR',
@@ -146,7 +146,7 @@ var nansQueryTpl = dot.template([
     'nans AS (',
     '  SELECT',
     '    count(*) AS nans_count',
-    '  FROM ({{=it._query}}) _cdb_histogram_infinities',
+    '  FROM ({{=it._query}}) __cdb_nans_query',
     '  WHERE {{=it._column}} = \'NaN\'::float',
     ')'
 ].join('\n'));