TODO
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coalesce, date functions now, add_date; string functions rtrim, ltrim, rpad, lpad; math function round
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add pipe | concatenation
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support for order by, offset, limit (allow column name in order by, validate)
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support for uniqueue indexes (primary key)
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support for btree indexes
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support for joining
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add count min and max functions, eg aggregate functions
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add const wherever should be
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PERF in Row::Row(const Row &other), could be more efficient (memory and cpu)
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use references where pointer cannot be nullptr