parse_table: Parse a BQ-style identifier into project/dataset/table IDs
Description
This function splits a table identifier (given as character) into its
components.
Usage
parse_table(table, project_id = NULL)
Arguments
project_id
(optional) project ID to use if none is provided
in table
Value
a list with project_id, dataset_id, and
table_id components (any of which may be NULL).