alamb opened a new pull request #8179:
URL: https://github.com/apache/arrow/pull/8179


   As pointed out on @jhorstmann: 
https://github.com/apache/arrow/pull/8161#issuecomment-691464193
   
   > One (not directly related) issue I noticed while trying this out, is that 
the local patterns seem to require the millisecond part, while for utc 
timestamps with "Z" they are optional:
   
   ```
   > select to_timestamp('2020-09-12T10:30:00') from test limit 1;
   ArrowError(ExternalError(General("Error parsing \'2020-09-12T10:30:00\' as 
timestamp")))
   
   > select to_timestamp('2020-09-12T10:30:00Z') from test limit 1;
   +-------------------------------------------+
   | totimestamp(Utf8("2020-09-12T10:30:00Z")) |
   +-------------------------------------------+
   | 1599906600000000000                       |
   +-------------------------------------------+
   ```
   
   This PR allows parsing local timestamp patterns without the fractional 
seconds and tests for same


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