Hi devs,

Function with constant parameters can be simplified, for example
```
select abs(-1) as a, sqrt(4) as b;
can be simplified as
select 1 as a, 2.0 as b;
```
The execution of the function occurs during planning rather than during
runtime.
I noticed that Spark supports this simplification. Can Calcite also support
it? I can log a new jira if you agree.

Best,
Hongyu

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