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* Arel: Implemented DB-aware NULL-safe comparison (#34451)Dmytro Shteflyuk2018-11-151-0/+39
| | | | | | | | | * 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]
* Emit single pair of parens for UNION and UNION ALLKeenan Brock2018-11-131-10/+0
| | | | | | | | 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
* Arel: rubocop -aMatthew Draper2018-02-241-17/+18
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* Merge Arel into Active RecordMatthew Draper2018-02-241-0/+79