[wp-trac] [WordPress Trac] #35909: Add index to wp_users.user_email

[WordPress Trac]

#35909: Add index to wp_users.user_email
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 Reporter:  pento        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.5
Component:  Database     |    Version:  trunk
 Severity:  normal       |   Keywords:  needs-patch
  Focuses:  performance  |
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 Now that login by email is in core (#9568), it's going to be super slow to
 lookup email address on large user tables, so `wp_users.user_email` needs
 an index.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35909>
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