fix(mysql): TIMESTAMP -> CAST

[barakalon]

cc @ginter

[barakalon]

note: didn't use seq_get because it returns an optional type, and cast doesn't accept an optional

[tobymao]

you could avoid the cast then

exp.Cast(this=seq_get(), ...)

[barakalon]

I changed it up a bit after reading mysql docs

[tobymao]

why is this needed?

[barakalon]

trying to transpile TIMESTAMP(x) to presto, which doesnt have such a function

[tobymao]

trying to transpile TIMESTAMP(x) to presto, which doesnt have such a function

wouldn't it make more sense to have presto generate the cast?

[tobymao]

let's do this on generation

[barakalon]

switched to generation. I'm a little scared because TIMESTAMP is also a type

[tobymao]

bigquery also has timestamp func

[barakalon]

Hm, yeah.
https://cloud.google.com/bigquery/docs/reference/standard-sql/timestamp_functions#timestamp

Seems like current implementation will still work, although we're overloading the expression arg for mysql and bigquery.