0.28.0

• Enable LTO (Link time optimization).
• Optimize set alias for selected expression.
• Handle groups rows elemenations in case group by don't create extra groups #117.
• Implement contains operator for Range in other Range.
• Implement IF, IFNULL general functions.
• Implement ARRAT_POSITIONS, TRIM_ARRAY array functions.
• Implement ISEMPTY range function.
• Implement WITH ROLLUP feature.
• Implement ORDER BY ... USING <operator> feature.
• Implement Overlap operator for Arrays and Ranges.
• Remove hidden selection information from the render.
• Handle WITH ROLLUP edge case for using one column only in grouping.
• Improve classifying columns on tables.