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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
...que_keys)]]
## t b a
## 1: 1 NA 1
## 2: 2 NA 4
## 3: 3 9 9
## 4: 4 16 16
## 5: 5 25 NA
## 6: 6 36 NA
# The following will give the same with the column order X,Y
X[Y[J(unique_keys)]]
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Twitter Bootstrap 3 Sticky Footer
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Black MambaBlack Mamba
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QuentinQuentin
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