Jefffrey commented on PR #24046:
URL: https://github.com/apache/datafusion/pull/24046#issuecomment-5155058719

   i think we need to account for edge cases like multiple underscores in a 
row, and trailing underscores
   
   ```sql
   postgres=# select 12__10;
   ERROR:  trailing junk after numeric literal at or near "12__10"
   LINE 1: select 12__10;
   postgres=# select 12_10_;
   ERROR:  trailing junk after numeric literal at or near "12_10_"
   LINE 1: select 12_10_;
   ```
   
   i think this code allows that whilst postgres forbids it


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