James Dunkerley 45276b243d Expanding Derived Columns and Expression Syntax (#3782) ... - Added expression ANTLR4 grammar and sbt based build. - Added expression support to `set` and `filter` on the Database and InMemory `Table`. - Added expression support to `aggregate` on the Database and InMemory `Table`. - Removed old aggregate functions (`sum`, `max`, `min` and `mean`) from `Column` types. - Adjusted database `Column` `+` operator to do concatenation (`||`) when text types. - Added power operator `^` to both `Column` types. - Adjust `iif` to allow for columns to be passed for `when_true` and `when_false` parameters. - Added `is_present` to database `Column` type. - Added `coalesce`, `min` and `max` functions to both `Column` types performing row based operation. - Added support for `Date`, `Time_Of_Day` and `Date_Time` constants in database. - Added `read` method to InMemory `Column` returning `self` (or a slice). # Important Notes - Moved approximate type computation to `SQL_Type`. - Fixed issue in `LongNumericOp` where it was always casting to a double. - Removed `head` from InMemory Table (still has `first` method).		2022-11-08 15:57:59 +00:00
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0.0.0-dev	Expanding Derived Columns and Expression Syntax (#3782)	2022-11-08 15:57:59 +00:00