spec_result_roundtrip
The column types of the returned data frame depend on the data returned:
integer for integer values between -2^31 and 2^31 - 1
numeric for numbers with a fractional component
logical for Boolean values (some backends may return an integer)
character for text
lists of raw for blobs (with NULL entries for SQL NULL values)
coercible using as.Date() for dates
(also applies to the return value of the SQL function current_date)
coercible using hms::as.hms() for times
(also applies to the return value of the SQL function current_time)
coercible using as.POSIXct() for timestamps
(also applies to the return value of the SQL function current_timestamp)
NA for SQL NULL values
If dates and timestamps are supported by the backend, the following R types are used:
Date for dates
(also applies to the return value of the SQL function current_date)
POSIXct for timestamps
(also applies to the return value of the SQL function current_timestamp)
R has no built-in type with lossless support for the full range of 64-bit or larger integers. If 64-bit integers are returned from a query, the following rules apply:
Values are returned in a container with support for the full range of
valid 64-bit values (such as the integer64 class of the bit64
package)
Coercion to numeric always returns a number that is as close as possible to the true value
Loss of precision when converting to numeric gives a warning
Conversion to character always returns a lossless decimal representation of the data