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That is completely covered by `Arel::Nodes::ValuesList`.
Related https://github.com/rails/arel/pull/484.
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* Arel: Implemented DB-aware NULL-safe comparison
* Fixed where clause inversion for NULL-safe comparison
* Renaming "null_safe_eq" to "is_not_distinct_from", "null_safe_not_eq" to "is_distinct_from"
[Dmytro Shteflyuk + Rafael Mendonça França]
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mysql has a great implementation to suppress multiple parens for union
sql statements.
This moves that functionality to the generic implementation
This also introduces that functionality for UNION ALL
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Follow up ae406cd633dab2cafbc0d1bb5922d1ca40056ea0.
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