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Function to get join keys from a tdata object

get_join_keys.Rd

Function to get join keys from a tdata object

Usage 

get_join_keys(data)

# S3 method for tdata
get_join_keys(data)

# S3 method for default
get_join_keys(data)

Arguments

data

tdata - object to extract the join keys

Value

Either JoinKeys object or NULL if no join keys