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epriestley 58884b94dc Simplify construction and execution of Differential queries for "responsible" users 
Summary:
Currently, when querying for responsible users (revisions where a given user is either the author or a reviewer), we do this:

  - If the query passes a bunch of hard-coded special cases, use a special hard-coded UNION.
  - Otherwise, use a very complicated JOIN/WHERE clause.

This is bad for several reasons:

  - Tons and tons of hard-coding and special casing.
  - The JOIN/WHERE clause performs very poorly for large datasets.
  - (As a material consequence, the homepage issues a responsible query which barely misses the hard-coded special cases and goes down the slow path.)

Instead, //always// use the UNION strategy to execute a "responsible" query. Specifically, if we have responsible PHIDs, temporarily add them to the author list and build a normal query, then repeat for reviewers, then UNION any clauses we built.

Fixes T3377. Ref T603. Ref T2625. Depends on D6342.

There's various folklore about UNION ALL / UNION DISTINCT performance. UNION DISTINCT is simpler here and the number of rows is small, although we could use UNION ALL in the form:

  SELECT * FROM ((SELECT ...) UNION ALL (SELECT ...) ORDER) GROUP LIMIT

...if we find that there's some performance benefit at some point.

Test Plan: Used DarkConsole to examine queries. Viewed home page and Differential dashboard/authors/subscribers.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603, T2625, T3377

Differential Revision: https://secure.phabricator.com/D6343
2013-07-03 05:39:09 -07:00
bin Push feed publishing deeper into the task queue 2013-06-25 16:29:47 -07:00
conf Provide contextual help on auth provider configuration 2013-06-20 11:18:48 -07:00
externals Update S3 external library 2013-07-02 18:55:08 -07:00
resources Mostly modernize Conduit logs 2013-07-01 12:37:34 -07:00
scripts Move "scripts/sql/probe.php" to "bin/storage probe" 2013-07-02 16:34:17 -07:00
src Simplify construction and execution of Differential queries for "responsible" users 2013-07-03 05:39:09 -07:00
support Minor, fix obvious typo in Aphlict server error handling. 2013-06-28 14:42:46 -07:00
webroot Add "state icons" to ObjectItemListView 2013-07-02 16:29:43 -07:00
.arcconfig Use JsShrink if jsxmin is not available 2013-05-18 17:04:22 -07:00
.divinerconfig Centralize rendering of application mail bodies 2012-07-16 19:01:43 -07:00
.editorconfig Specify config for text editors 2012-11-03 22:34:44 -07:00
.gitignore Ignore and README for support/bin 2013-04-03 12:58:39 -07:00
LICENSE Delete license headers from files 2012-11-05 11:16:51 -08:00
NOTICE Increment year. 2013-01-03 05:45:08 -08:00
README Undo accidental commit of garbage to README 2013-05-20 16:16:49 -07:00

README 

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