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Description:Acknowledging that cases where tables contain many columns but queries involving joins only use a few of them are rather common, we had to care about this seriously. We are planning a few more additional local optimizations, for example using merge joins when the operands are suitably ordered, but our attention will imminently grow to a larger scope. SELECT statements using multiple joins are transformed to a tree of binary join operations that follow the syntax of the query, assuming the join operator is left-associative. Elision of unused columns In addition to the work presented so far, which supports the bulk of the acceleration of queries compared to summer , another optimization was introduced under the hood.

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Views: 2739 Date: 2018-06-29 Favorited: 64 favorites

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