Documentation for try and try_cast not clear for cast errors

it appears that try() and try_cast() are not handling invalid type cast errors. Here is what I’m seeing on the teradata sandbox vm

presto> select try(cast(0.01 as date)); Query 20170217_090614_00041_fchrk failed: line 1:12: Cannot cast decimal(2,2) to date select try(cast(0.01 as date))

and try_cast()

presto> select try_cast(0.01 as timestamp); Query 20170217_084646_00032_fchrk failed: line 1:8: Cannot cast decimal(2,2) to timestamp select try_cast(0.01 as timestamp)

[electrum]

I see the confusion with the documentation. It says returns null if the cast fails which means fails at runtime. That’s different than the cast not existing, but it’s easy to misinterpret. We can make the documentation more explicit.

[stale[bot]]

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