$data = "kirill@oracle.com";
$hash = sha1($data) + md5($data);
scala> spark.sql("select count(*) from(select distinct v1,v2 from graph_df)").show()
+--------+
|count(1)|
+--------+
| 1343124|
+--------+
scala> spark.sql("select count(*) from (select v1 from graph_df union select v2 from graph_df)").show()
+--------+
|count(1)|
+--------+
| 166061|
+--------+