make any column searchable in postgres

src/Illuminate/Database/Query/Grammars/PostgresGrammar.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Database\Query\Grammars;
 
 use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
 use Illuminate\Database\Query\Builder;
 
 class PostgresGrammar extends Grammar
@@ -20,6 +21,43 @@ class PostgresGrammar extends Grammar
         'is distinct from', 'is not distinct from',
     ];
 
+    /**
+     * {@inheritdoc}
+     *
+     * @param Builder $query
+     * @param array   $where
+     *
+     * @return string
+     */
+    protected function whereBasic(Builder $query, $where)
+    {
+        // Special treatment for like clauses. In order to make
+        // any column searchable, we need to convert it to text.
+        if (Str::contains($where['operator'], 'like')) {
+            return $this->whereBasicLike($query, $where);
+        }
+
+        $value = $this->parameter($where['value']);
+
+        return $this->wrap($where['column']).' '.$where['operator'].' '.$value;
+    }
+
+    /**
+     * Compile a "where like" clause. Suffix column with text conversion
+     * to make numeric columns searchable.
+     *
+     * @param Builder $query
+     * @param array   $where
+     *
+     * @return string
+     */
+    protected function whereBasicLike(Builder $query, $where)
+    {
+        $value = $this->parameter($where['value']);
+
+        return $this->wrap($where['column']).' :: text '.$where['operator'].' '.$value;
+    }
+
     /**
      * Compile a "where date" clause.
      *