mchades opened a new issue, #9871:
URL: https://github.com/apache/gravitino/issues/9871
### Describe the subtask
Enable function overloading with different return types by moving
`returnType` and `returnColumns` from the `Function` level to the
`FunctionDefinition` level.
Currently, all overloaded function definitions share the same return type
at the Function level. This prevents registering functions like:
- `add(x int, y int) => int`
- `add(x float, y float) => float`
With this change, each `FunctionDefinition` will have its own
`returnType` and `returnColumns`, allowing true function overloading with
different return types.
### Parent issue
#6158
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