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Gian Merlino 77df5e0673 ExpressionSelectors: Add optimized selectors. (#5048) 
* ExpressionSelectors: Add caching selectors.

- SingleLongInputCaching selector for expressions on the __time column,
  using a similar optimization to SingleScanTimeDimSelector
- SingleStringInputDimensionSelector for expressions on string columns
  that return strings, using a similar optimization to ExtractionFn
  based DimensionSelectors.
- SingleStringInputCaching selector for expressions on string columns
  that return primitives.

Also, in the SQL planner, prefer expressions for time operations
rather than extractionFns.

* Code review comments.
 		2017-11-13 20:24:24 -08:00
..
src ExpressionSelectors: Add optimized selectors. (#5048) 2017-11-13 20:24:24 -08:00
pom.xml Add Emitter monitoring (#4973) 2017-11-03 21:27:57 -06:00