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* Arel: Implemented DB-aware NULL-safe comparison (#34451)Dmytro Shteflyuk2018-11-151-0/+33
| | | | | | | | | * 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]
* Merge pull request #34437 from kbrock/union_all_parenRafael Mendonça França2018-11-131-4/+19
|\ | | | | | | Fix: Arel now emits a single pair of parens for UNION and UNION ALL
| * Emit single pair of parens for UNION and UNION ALLKeenan Brock2018-11-131-4/+19
|/ | | | | | | | 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
* Checking boundable not only `IN` clause but also `NOT IN` clauseRyuta Kamizono2018-11-031-0/+12
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* Refactor Arel visitor to use `collect_nodes_for` as much as possibleRyuta Kamizono2018-10-101-33/+10
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* Improve DELETE with JOIN handling to avoid subqueries if possibleRyuta Kamizono2018-10-101-1/+7
| | | | | | | | | | | | | | Before: ``` Pet Destroy (0.8ms) DELETE FROM `pets` WHERE `pets`.`pet_id` IN (SELECT `pet_id` FROM (SELECT DISTINCT `pets`.`pet_id` FROM `pets` LEFT OUTER JOIN `toys` ON `toys`.`pet_id` = `pets`.`pet_id` WHERE `toys`.`name` = ?) AS __active_record_temp) [["name", "Bone"]] ``` After: ``` Pet Destroy (1.0ms) DELETE `pets` FROM `pets` LEFT OUTER JOIN `toys` ON `toys`.`pet_id` = `pets`.`pet_id` WHERE `toys`.`name` = ? [["name", "Bone"]] ```
* Move UPDATE/DELETE with JOIN handling to the Arel sideRyuta Kamizono2018-10-031-20/+49
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* Handle UPDATE/DELETE with OFFSET in ArelRyuta Kamizono2018-10-011-1/+2
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* Handle DELETE with LIMIT in ArelRyuta Kamizono2018-09-301-17/+17
| | | | | | | | | | | | | | | | | | MySQL supports DELETE with LIMIT and ORDER BY. https://dev.mysql.com/doc/refman/8.0/en/delete.html Before: ``` Post Destroy (1.0ms) DELETE FROM `posts` WHERE `posts`.`id` IN (SELECT `id` FROM (SELECT `posts`.`id` FROM `posts` WHERE `posts`.`author_id` = ? ORDER BY `posts`.`id` ASC LIMIT ?) __active_record_temp) [["author_id", 1], ["LIMIT", 1]] ``` After: ``` Post Destroy (0.4ms) DELETE FROM `posts` WHERE `posts`.`author_id` = ? ORDER BY `posts`.`id` ASC LIMIT ? [["author_id", 1], ["LIMIT", 1]] ```
* `visitor.accept` doesn't handle `&block`Ryuta Kamizono2018-09-301-2/+2
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* Remove `visit_Fixnum` and `visit_Bignum`Ryuta Kamizono2018-09-281-2/+0
| | | | Since Ruby 2.4 unified Fixnum and Bignum into Integer.
* Make `update_counters` preparableRyuta Kamizono2018-09-281-1/+1
| | | | | | | | | | | | | | | | Before: ``` Topic Update All (0.4ms) UPDATE `topics` SET `topics`.`replies_count` = COALESCE(`topics`.`replies_count`, 0) + 1, `topics`.`updated_at` = '2018-09-27 18:34:05.068774' WHERE `topics`.`id` = ? [["id", 7]] ``` After: ``` Topic Update All (0.4ms) UPDATE `topics` SET `topics`.`replies_count` = COALESCE(`topics`.`replies_count`, 0) + ?, `topics`.`updated_at` = ? WHERE `topics`.`id` = ? [["replies_count", 1], ["updated_at", 2018-09-27 18:55:05 UTC], ["id", 7]] ```
* Abandon TOP support.Vladimir Kochnev2018-09-251-7/+0
| | | | | | | | | | | | | | | | 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.
* Consistently use `visitor.compile`Ryuta Kamizono2018-09-091-2/+2
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* Arel: :nodoc: allMatthew Draper2018-02-241-1/+1
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* Arel: rubocop -aMatthew Draper2018-02-241-619/+620
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* Merge Arel into Active RecordMatthew Draper2018-02-241-0/+846
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