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(Note that running an expression constraint query is additional, when this is not used, there is no performance loss on AQL. For optimization reason, in the beginning, f.e. in prototype, the best is to call this module as last. When a dataset comes through all WHERE-tests in AQL, it should be tested for SCT-condition. In this way, the expression-constraint, which runs un-optimized, does not need to test many post-coordinated string, and the expression contraint engine can have some optimizations totoo, but will on performance not be able too to compete with indexed AQL statements.)
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