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Introduce algebra operator for set membership

Description

Currently, SPARQL's `IN` operator is translated by the parser into a tree of `OR` operators. While functionally correct, a more compact algebra representaiton is called for to avoid large recursions (and consequently, stack overflows) when evaluating a very large set membership clause.

Environment

None

Status

Assignee

JeenB

Reporter

JeenB

Labels

None

Fix versions

Priority

Major