def join $($relation$\_$one: Table, relation$\_$two: Table, join$\_$condition: str$)->$ Table:

$"""$

Performs Theta JOIN on two relations

:param relation$\_$one: Table object, the R$1$ relation in the theta join

:param relation$\_$two: Table object, the R$2$ relation in the theta join

:param condition: str$,$ the condition for theta join

:return: Table object, the resulted relation after R$1$ theta join R$2$

Hint: Use cartesian function provided

$"""$

join$\_$relation $=$ Table$("$JoinTable$")$

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