Export sql functions to create a new dbplyr backend outside of dbplyr?

[eitsupi]

I believe that currently if we create a new dbpryr backend outside of dbplyr, we will need to use non-exported functions.

For example in duckdb:
https://github.com/duckdb/duckdb-r/blob/7eeac781c7e524250f53b85bce8024fa01ad24c6/R/backend-dbplyr__duckdb_connection.R#L84-L99

Is there any reason not to export these functions?

[hadley]

Just because they require a little more thought about their interface. But I think it's worth doing, and I'll try tackle early next year as part of a bigger push to standardise string and date handling across backends.