Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/21010
> Basically LGTM, but I'm wondering what if the expr2 is not like a format
string?
The same as Hive:
```sql
spark-sql> SELECT format_number(12332.123456, 'abc');
abc12332
```
```sql
hive> SELECT format_number(12332.123456, 'abc');
OK
abc12332
Time taken: 0.218 seconds, Fetched: 1 row(s)
```
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