Improve performance on any directed edges #110
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Fixes #107
Fixes #109
Fixes #60
A bottleneck was the edge patterns containing the
ANYedge (-[]-), see IS3. Previously this resulted in a slow blockwise nested loop join. We transform it into a union on the edge table (src, dst, * from edge_table UNION ALL dst, src, * from edge_table), resulting in two hash joins.