I think you're confusing join with cat

$ cat a
1 a
2 A
$ cat b
1 b
2 B
$ join a b
1 a b
2 A B

[download]

Your code would return:

1 a
2 A
1 b
2 B

[download]

In reply to Re^2: Speed of Split by ikegami
in thread Speed of Split by Lexicon

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