[1.0.0] Only materialize the attributes needed in PDO. #227
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…ount of time with lots of attributes + entries.
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This save a considerable amount of time with lots of attributes + entries. Specifically, we only instantiate attributes that we know we need. There's some subtlety here because if an attribute is used within a filter (not just selected), then we also need it because PDO can product inexact results that we have to re-filter in code which means we need the attribute + value. Also cases of selecting operational attributes or specifically selecting no attributes. So quite a few weird edge cases here.