Revert "Remove DISTINCT clause from filter_get_bug_rows query"

This reverts commit 9c57416.

Issue #16259

core/filter_api.php

@@ -2066,7 +2066,7 @@ function filter_get_bug_rows( &$p_page_number, &$p_per_page, &$p_page_count, &$p
 	$p_page_number = filter_valid_page_number( $p_page_number, $p_page_count );
 	$t_offset = filter_offset( $p_page_number, $p_per_page );
 	$t_query_clauses = filter_unique_query_clauses( $t_query_clauses );
-	$t_select_string = "SELECT " . implode( ', ', $t_query_clauses['select'] );
+	$t_select_string = "SELECT DISTINCT " . implode( ', ', $t_query_clauses['select'] );
 	$t_from_string = " FROM " . implode( ', ', $t_query_clauses['from'] );
 	$t_order_string = " ORDER BY " . implode( ', ', $t_query_clauses['order'] );
 	$t_join_string = count( $t_query_clauses['join'] ) > 0 ? implode( ' ', $t_query_clauses['join'] ) : '';