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* 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.