Gian Merlino d4ef0f6d94 Improved SQL support for floats and doubles. (#4598)
* Improved SQL support for floats and doubles.

- Use Druid FLOAT for SQL FLOAT, and Druid DOUBLE for SQL DOUBLE, REAL,
  and DECIMAL.
- Use float* aggregators when appropriate.
- Add tests involving both float and double columns.
- Adjust documentation accordingly.

* CR comments.

* Fix braces.
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