comphead commented on issue #10688:
URL: https://github.com/apache/datafusion/issues/10688#issuecomment-2136159580

   Thats weird.
   
   ```
   > explain select -128.2::float union all select -128.2;
   
+---------------+-------------------------------------------------------------------+
   | plan_type     | plan                                                       
       |
   
+---------------+-------------------------------------------------------------------+
   | logical_plan  | Union                                                      
       |
   |               |   Projection: Float64(-128.1999969482422) AS (- 
Float64(128.2))   |
   |               |     EmptyRelation                                          
       |
   |               |   Projection: Float64(-128.2) AS (- Float64(128.2))        
       |
   |               |     EmptyRelation                                          
       |
   | physical_plan | UnionExec                                                  
       |
   |               |   ProjectionExec: expr=[-128.1999969482422 as (- 
Float64(128.2))] |
   |               |     PlaceholderRowExec                                     
       |
   |               |   ProjectionExec: expr=[-128.2 as (- Float64(128.2))]      
       |
   |               |     PlaceholderRowExec                                     
       |
   |               |                                                            
       |
   
+---------------+-------------------------------------------------------------------+
   ```
   
   So first values transforms into `-128.1999969482422`, but the second is 
intact


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