[wp-trac] [WordPress Trac] #27557: Make operator case insensitive in tax queries

[WordPress Trac]

#27557: Make operator case insensitive in tax queries
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 Reporter:  clifgriffin  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Query        |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 In `WP_Tax_Query::get_sql()` the operator is assumed / required to be
 uppercase.

 This conforms to preferred SQL syntax, but there isn't a good reason I can
 think of to enforce this here.

 The simplest fix is is to force `$operator` to uppercase, allowing for a
 variety of input.  I'm attaching a patch to that effect.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27557>
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