Safe divide

[tiboun]

Safe divide currently doesn't return the correct answer.

Given:

SELECT SAFE_DIVIDE(5, 4) a;

it gets translated to :

SELECT /* Approximation: SAFE variant not supported */ DIVIDE(5, 4) a

But divide in duckdb is an alias for // which is getting the integer part and not the precision part.

I think, this should be translated to:

SELECT if(4 != 0, 5/4, NULL) as a