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View Code? Open in Web Editor NEWEvaluation of relational algebra and some SQL constructs in pure JavaScript.
Evaluation of relational algebra and some SQL constructs in pure JavaScript.
Since the exodus of the parser into a separate package, the package structure has become unnecessarily complicated. Clean up!
Joins currently only support equality predicates, like A.x = B.y
. We should be flexible enough to handle arbitrary predicates, including inequalities.
Creating the CrossProduct of two relations with overlapping schema
schema(A) = ["a","b"]
schema(B) = ["b","c"]
Leads to an error (tuples don't match schema). This stems from both schemas having a field b
which, which can't be reflected in the schema, which internally is a key-set. So it should either be renamed to something like b'
automatically or fail with a more appropriate error message.
NB: formally, this operation is not defined anyway. Having to rename it is the most appropriate way to handle it.
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