Search a data.frame for 1:cardinality relationships between a group of columns (your identifiers) and all other columns.

Search a data.frame for 1:cardinality relationships between a group of columns (your identifiers) and all other columns.

Usage

checkColumnCardinality(df, group, cardinality = 1, ...)

df: A data.frame to search for 1:cardinality mappings with the columns in group.
group: A character vector of one or more column names to check the cardinality of other columns against.
cardinality: The cardinality of to search for (i.e., 1:cardinality) relationships with the combination of columns in group. Defaults to 1 (i.e., 1:1 mappings).
...: Fall through arguments to data.table::[. For developer use. One use case is setting verbose=TRUE to diagnose slow data.table operations.

A character vector with the names of the columns with cardinality of 1:cardinality with the columns listed in group.

df <- rawdata(exampleDataMapper)
checkColumnCardinality(df, group='treatmentid')
#> [1] "sampleid" "metadata"