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Projection Operator
Zuozhi Wang edited this page Aug 29, 2016
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Author(s): Zuozhi Wang
Reviewer(s): Chen Li
Implement an operator to use an index-based method based on gram inverted index to support efficient regular expressions on large datasets. Our implementation is based on Russ Cox's algorithm and the corresponding open source implementation.
As of 8/29/2016: FINISHED
edu.uci.ics.textdb.dataflow.projection
https://github.com/TextDB/textdb/pull/209
A projection operator projects a subset of columns (fields, attributes) of a tuple to a new tuple consisting of those fields.