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for my $dc (@default_columns) {
    $dc =~ s/([A-Z])/_\l$1/g;
    $allowed_columns{$dc} = 1;
}

for my $dc (@default_columns) {
    my $t;
    ($t=$dc) =~ s/([A-Z])/_\l$1/g;
    $allowed_columns{$t} = 1;
}