Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/192#issuecomment-58388360
Looks very interesting. Please keep going. Although, as we know, index is
only useful in the case where the selectivity is low, it has great potential to
boost up performance. If we give users a good guide, index can be a killer
feature in this field.
Could you let us know index size and data volume? My primary concern on the
current implementation is the index file structure (BSTIndex), which is a large
and individual file per task. If your implementation is the same, we can make
an effort to investigate its next generation index structure.
In addition, could you please update index_support branch and reupload your
patch. The differences between branch may include lots of other changes.
Thanks,
Hyunsik
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