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returns a data frame with at least two columns "name" and "type" (in that order) (and optional columns that start with a dot). The "name" and "type" columns contain the names and types of the R columns of the data frame that is returned from dbFetch(). The "type" column is of type character and only for information. Do not compute on the "type" column, instead use dbFetch(res, n = 0)

to create a zero-row data frame initialized with the correct data types.

Failure modes

An attempt to query columns for a closed result set raises an error.


A column named row_names is treated like any other column.

The column names are always consistent with the data returned by dbFetch().

If the query returns unnamed columns, non-empty and non-NA names are assigned.

Column names that correspond to SQL or R keywords are left unchanged.