Unnest a data frame consisting of tsibbles to a tsibble

Usage

unnest_tsibble(data, cols, key = NULL, validate = TRUE)

data: A data frame contains homogenous tsibbles in the list-columns.
cols: Names of columns to unnest.
key: Variable(s) that uniquely determine time indices. NULL for empty key, and c() for multiple variables. It works with tidy selector (e.g. dplyr::starts_with()).
validate: TRUE suggests to verify that each key or each combination of key variables leads to unique time indices (i.e. a valid tsibble). If you are sure that it's a valid input, specify FALSE to skip the checks.