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The following page has been changed by PiSong: http://wiki.apache.org/pig/NestedLogicalPlan The comment on the change is: small mistake ------------------------------------------------------------------------------ Table C {{{ - FILTER : Bag x (f: Tuple -> Boolean ) -> Bag + FILTER : Bag x (f: Tuple -> Boolean ) -> Bag - COGroup : [ Bag, f: Tuple -> Tuple ]^n -> Bag + COGroup : [ Bag, f: Tuple -> Tuple ]^n -> Bag FOREACH : Bag x (f: Tuple -> Tuple) -> Bag GENERATE : Tuple x (list of flatten flags) -> Tuple Note: If we just forget the flatten flags of GENERATE, it can be reduced to "GENERATE: Tuple -> Tuple" - PROJECT : Tuple x (list of indices) -> Tuple + PROJECT : Tuple x (list of indices) -> Tuple - CROSS : Bag x Bag -> Bag + CROSS : Bag x Bag -> Bag - JOIN : This can be constructed by COGroup - - ORDER : Bag x (f: Tuple x Tuple -> CompareResult) -> Bag + ORDER : Bag x (f: Tuple x Tuple -> CompareResult) -> Bag - DISTINCT: Bag x (f: Tuple x Tuple -> CompareResult) -> Bag + DISTINCT: Bag x (f: Tuple x Tuple -> CompareResult) -> Bag - UNION: Bag x Bag -> Bag + UNION: Bag x Bag -> Bag - SPLIT: [ Bag, f: Tuple -> Boolean ]^n -> Bag^n + SPLIT: Bag x [f: Tuple -> Boolean ]^n -> Bag^n + + JOIN : This can be constructed by COGroup }}} == Problems with current Operators (5-May-2008) ==
