Add share index

[tomneedham]

Description

SELECT `share_with` FROM `oc_share` WHERE `item_source` = 'fileid' AND `share_type` = '3' AND `item_type` IN ('file', 'folder') LIMIT 1;

becomes an expensive query when there are lots of shares in the table.

Motivation and Context

Less DB load, faster queries.

How Has This Been Tested?

Locally installation and sharing.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #29864 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master   #29864      +/-   ##
============================================
+ Coverage     60.51%   60.51%   +<.01%     
- Complexity    18374    18382       +8     
============================================
  Files          1090     1091       +1     
  Lines         60933    60954      +21     
============================================
+ Hits          36874    36888      +14     
- Misses        24059    24066       +7

Impacted Files	Coverage Δ	Complexity Δ
...aring/appinfo/Migrations/Version20171215103657.php	0% <0%> (ø)	2 <2> (?)
lib/private/User/Manager.php	76.02% <0%> (+0.26%)	60% <0%> (+1%)	⬆️
lib/private/legacy/template.php	44.65% <0%> (+0.7%)	39% <0%> (+1%)	⬆️
lib/private/Template/Base.php	73.58% <0%> (+2.47%)	17% <0%> (+4%)	⬆️

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[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.