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Go SDK: Biquery and Legacy SQL

I am trying to read a column of type TIMESTAMP, this type is mapped by the bigquery client to time.Time.  Unfortunately, it is not possible to use time.Time structs because this type contains slices which are not supported by the beam Go SDK (run fine in the direct runner, but panic on dataflow).

The workaround I was seeking was to use SQL function UNIX_SECONDS() thus converting the timestamp to an int64. The problem now is that UNIX_SECONDS is not part of the legacy SQL.

Why brings me to my questions: Why is the Go SDK using Legacy SQL? Is there a technical reason for this? If I write my own bigquery transform will I regret it if I use Standard SQL?