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The following page has been changed by OlgaN: http://wiki.apache.org/pig/JoinFramework ------------------------------------------------------------------------------ Currently neither Pig nor Hadoop have indexing structure. So getting to this point might take some time and needs some compelling use cases to make the investment. + == Metadata == + + To choose best join algorithm, additional information about the data is required. This data can be stored with the data or in a separate repository in which case Pig can consume this data and make choices on user's behalf. However, part of Pig philosophy is to it anything which means in this case to operate correctly and as efficiently as possible in the absense of the metadata. Also, even if metadata is available user should be able to dictate how to join the data. + + === Metadata Available === + === No Metadata Available === +
