Prefix with double underscore

lib/cartodb/models/dataview/histogram.js

@@ -54,7 +54,7 @@ var BIN_MAX_NUMBER = 48;
 var filteredQueryTpl = dot.template([
     '__cdb_filtered_source AS (',
     '  SELECT *',
-    '  FROM ({{=it._query}}) _cdb_filtered_source_query',
+    '  FROM ({{=it._query}}) __cdb_filtered_source_query',
     '  WHERE',
     '    {{=it._column}} IS NOT NULL',
     '  {{?it._isFloatColumn}}AND',
@@ -94,7 +94,7 @@ var iqrQueryTpl = dot.template([
     '    FROM __cdb_filtered_source) _cdb_quartiles',
     '    WHERE quartile = 1 or quartile = 3',
     '    GROUP BY quartile',
-    '  ) _cdb_iqr',
+    '  ) __cdb_iqr',
     ')'
 ].join('\n'));
 
@@ -125,7 +125,7 @@ var nullsQueryTpl = dot.template([
     '__cdb_nulls AS (',
     '  SELECT',
     '    count(*) AS __cdb_nulls_count',
-    '  FROM ({{=it._query}}) _cdb_histogram_nulls',
+    '  FROM ({{=it._query}}) __cdb_histogram_nulls',
     '  WHERE {{=it._column}} IS NULL',
     ')'
 ].join('\n'));
@@ -230,7 +230,7 @@ var dateBinsQueryTpl = dot.template([
     '                )',
     '           ) AS __cdb_bins_array',
     '       FROM __cdb_basics',
-    '    ) _cdb_bins_array_query',
+    '    ) __cdb_bins_array_query',
     ')'
 ].join('\n'));