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The following page has been changed by EdChi: http://wiki.apache.org/pig/PigLatin The comment on the change is: fixed typo ------------------------------------------------------------------------------ [[Anchor(Nested_Operations_in_FOREACH...GENERATE)]] ==== Nested Operations in FOREACH...GENERATE ==== - If one of the fields in the input relation is a data bag, the nested data bag can be treated as an '''inner''' or a '''nested relation'''. Consequently, in a FOEACH...GENERATE statement, we can perform many of the operations on this nested relation that we can on a regular relation. + If one of the fields in the input relation is a data bag, the nested data bag can be treated as an '''inner''' or a '''nested relation'''. Consequently, in a FOREACH...GENERATE statement, we can perform many of the operations on this nested relation that we can on a regular relation. The specific operations that we can do on the nested relations are [#FILTER:_Getting_rid_of_data_you_are_not_interested_in_ FILTER], [#ORDER:_Sorting_data_according_to_some_fields ORDER], and [#DISTINCT:_Eliminating_duplicates_in_data DISTINCT]. Note that we do not allow FOREACH...GENERATE on the nested relation, since that leads to the possibility of arbitrary number of nesting levels.
