apply_filters_ref_array( ‘posts_distinct’, string $distinct, WP_Query $query )

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   Steven Lin 5 years ago

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   Example Migrated from Codex:

   Eliminate duplicates in posts returned, unless the duplicates is allowed

   add_filter('posts_distinct', 'search_distinct');
   
   function search_distinct() {
   	if ( $this->allow_duplicates )
   		return ""; // filter has no effect
   	return "DISTINCT";
   }