+ /**
+ * Override reallyDoQuery to mix together two queries.
+ *
+ * @note $asc is named $descending in IndexPager base class. However
+ * it is true when the order is ascending, and false when the order
+ * is descending, so I renamed it to $asc here.
+ */
+ function reallyDoQuery( $offset, $limit, $asc ) {
+ $prevTableName = $this->mTableName;
+ $this->mTableName = 'image';
+ list( $tables, $fields, $conds, $fname, $options, $join_conds ) = $this->buildQueryInfo( $offset, $limit, $asc );
+ $imageRes = $this->mDb->select( $tables, $fields, $conds, $fname, $options, $join_conds );
+ $this->mTableName = $prevTableName;
+
+ if ( !$this->mShowAll ) {
+ return $imageRes;
+ }
+
+ $this->mTableName = 'oldimage';
+
+ # Hacky...
+ $oldIndex = $this->mIndexField;
+ if ( substr( $this->mIndexField, 0, 4 ) !== 'img_' ) {
+ throw new MWException( "Expected to be sorting on an image table field" );
+ }
+ $this->mIndexField = 'oi_' . substr( $this->mIndexField, 4 );
+
+ list( $tables, $fields, $conds, $fname, $options, $join_conds ) = $this->buildQueryInfo( $offset, $limit, $asc );
+ $oldimageRes = $this->mDb->select( $tables, $fields, $conds, $fname, $options, $join_conds );
+
+ $this->mTableName = $prevTableName;
+ $this->mIndexField = $oldIndex;
+
+ return $this->combineResult( $imageRes, $oldimageRes, $limit, $asc );
+ }
+
+ /**
+ * Combine results from 2 tables.
+ *
+ * Note: This will throw away some results
+ *
+ * @param $res1 ResultWrapper
+ * @param $res2 ResultWrapper
+ * @param $limit int
+ * @param $ascending boolean See note about $asc in $this->reallyDoQuery
+ * @return FakeResultWrapper $res1 and $res2 combined
+ */
+ protected function combineResult( $res1, $res2, $limit, $ascending ) {
+ $res1->rewind();
+ $res2->rewind();
+ $topRes1 = $res1->next();
+ $topRes2 = $res2->next();
+ $resultArray = array();
+ for ( $i = 0; $i < $limit && $topRes1 && $topRes2; $i++ ) {
+ if ( strcmp( $topRes1->{ $this->mIndexField }, $topRes2->{ $this->mIndexField } ) > 0 ) {
+ if ( !$ascending ) {
+ $resultArray[] = $topRes1;
+ $topRes1 = $res1->next();
+ } else {
+ $resultArray[] = $topRes2;
+ $topRes2 = $res2->next();
+ }
+ } else {
+ if ( !$ascending ) {
+ $resultArray[] = $topRes2;
+ $topRes2 = $res2->next();
+ } else {
+ $resultArray[] = $topRes1;
+ $topRes1 = $res1->next();
+ }
+ }
+ }
+ for ( ; $i < $limit && $topRes1; $i++ ) {
+ $resultArray[] = $topRes1;
+ $topRes1 = $res1->next();
+ }
+ for ( ; $i < $limit && $topRes2; $i++ ) {
+ $resultArray[] = $topRes2;
+ $topRes2 = $res2->next();
+ }
+ return new FakeResultWrapper( $resultArray );
+ }
+