Check whether the given join_map_levels_by is valid

The join_map_levels_by must be a named vector of at most one element. The columns specified in the vector must be data slots of the spdfs in the spdfs_list.

Usage,

assert_join_map_levels_by(join_map_levels_by, spdfs_list)

Arguments

join_map_levels_by

A named vector with the columns to join the map levels by.

spdfs_list

A list with the spdfs of all map levels.

Value

the join_map_levels_by in the right order