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The following page has been changed by PradeepKamath: http://wiki.apache.org/pig/PigMergeJoin ------------------------------------------------------------------------------ Perhaps a figure might help illustrate: Left input block 1: + ================== || 25 || || .. || || 35 || Left input block 2: + =================== || 45 || || .. || || 65 || - Right input + Right input: + =========== || 10 || || .. || || 24 || @@ -118, +121 @@ || 44 || || 45 || || .. || + The first map would need to know it is the first map and hence handle the outer join for all the values on the right side < the first key (10 upto 24). It would then handle the join of all values present in the first block of the left input (25 to 35). It would also need to continue to read on the right side upto the first value in the next block of the left input (i.e. upto 44 inclusive). The next map (map on 2nd block) would handle the join of all values from 45 to EOF on right side. In current implementation (r806281) only inner joins are supported.
