caoxuewen created SPARK-20850:
---------------------------------

             Summary: Improve division and multiplication mixing process the 
data
                 Key: SPARK-20850
                 URL: https://issues.apache.org/jira/browse/SPARK-20850
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: caoxuewen



spark-sql> select  (1234567890123456789012 / 12345678901234567890120) * 
12345678901234567890120;
NULL
spark-sql> select  (12345678901234567890 / 123) * 123;
NULL

when the length of the getText is greater than 19, The result is not what we 
expected.
but mysql handle the value is ok.

mysql> select (1234567890123456789012 / 12345678901234567890120) * 
12345678901234567890120;
+------------------------------------------------------------------------------+
| (1234567890123456789012 / 12345678901234567890120) * 12345678901234567890120 |
+------------------------------------------------------------------------------+
|                                                  1234567890123456789012.0000 |
+------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> select (12345678901234567890 / 123) * 123;
+------------------------------------+
| (12345678901234567890 / 123) * 123 |
+------------------------------------+
|          12345678901234567890.0000 |
+------------------------------------+
1 row in set (0.00 sec)



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