yaooqinn commented on issue #26626: [SPARK-29986][SQL] Introduce java like 
string trim to UTF8String
URL: https://github.com/apache/spark/pull/26626#issuecomment-557053311
 
 
   > can you try `select trim('2019-10-10\t')` in other databases?
   
   we are not changing string trim here, but here is the test result.
   ```sql
   postgres=# select length(trim(E'2019-10-10\t'));
    length
   --------
        11
   (1 row)
   ```
   
   ```
   presto> select length(trim('2019-10-10' || CHR(09)));
    _col0
   -------
       10
   (1 row)
   ```
   ```
   hive
   select length(trim('2019-10-10\t')) 
   "_c0"
   "11"
   ```

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