| Commit message (Collapse) | Author | Age | Files | Lines |
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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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Initially, `TOP` was introduced to support `limit` for MSSQL database.
Unlike PostgreSQL/MySQL/SQLite, MSSQL does not have native `LIMIT`/`OFFSET` support.
The commit adding `TOP` is 1a246f71616cf246a75ef6cbdb56032e43d4e643.
However, it figured out that `TOP` implementation was weak and it's not sufficient
to also support `OFFSET`, then `TOP` was substituted with
`ROW_NUMBER()` subquery in be48ed3071fd6524d0145c4ad3faeb4aafe3eda3.
This is a well known trick in MSSQL -
https://stackoverflow.com/questions/2135418/equivalent-of-limit-and-offset-for-sql-server.
So now we don't need this `visit_Arel_Nodes_Top` at all.
It does nothing useful but also adds an extra space after `SELECT` when `LIMIT` is being
used for **any** database.
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