Prevent using cast column from alias `__ctx_query`

Fixes #1160 by keep the original name of the column and using it if the
column type is date.

lib/models/dataview/histograms/numeric-histogram.js

@@ -52,10 +52,18 @@ Numeric histogram:
 */
 module.exports = class NumericHistogram extends BaseHistogram {
     _buildQuery (psql, override, callback) {
+        let column = this.column;
+        let query = this.query;
+        // for date type we have to cast the column using an alias
+        // and using that alias to prevent multiple calls to the cast
+        if (this._columnType === 'date') {
+            query = `(SELECT *, ${utils.columnCastTpl({ column })} as __cdb_cast_date FROM (${this.query}) __cdb_original_query)`;
+            column = '__cdb_cast_date';
+        }
         const histogramSql = this._buildQueryTpl({
-            column: this._columnType === 'date' ? utils.columnCastTpl({ column: this.column }) : this.column,
+            column,
             isFloatColumn: this._columnType === 'float',
-            query: this.query,
+            query,
             start: this._getBinStart(override),
             end: this._getBinEnd(override),
             bins: this._getBinsCount(override),