diff --git a/formats/datatables/QuerySegmentListProcessor.php b/formats/datatables/QuerySegmentListProcessor.php
new file mode 100644
index 000000000..1ca726f57
--- /dev/null
+++ b/formats/datatables/QuerySegmentListProcessor.php
@@ -0,0 +1,390 @@
+<?php
+/**
+ * adds $this->joinConditions and $this->fromTables
+ * to the original QuerySegmentListProcessor for the
+ * use with SearchPanes
+ */
+namespace SRF\DataTables;
+
+use RuntimeException;
+use SMW\MediaWiki\Database;
+use SMW\SQLStore\QueryEngine\QuerySegment;
+use SMW\SQLStore\TableBuilder\TemporaryTableBuilder;
+use SMWQuery as Query;
+
+class QuerySegmentListProcessor {
+	/* @var array */
+	public $joinConditions = [];
+
+	/* @var array */
+	public $fromTables = [];
+
+	/**
+	 * @var Database
+	 */
+	private $connection;
+
+	/**
+	 * @var TemporaryTableBuilder
+	 */
+	private $temporaryTableBuilder;
+
+	/**
+	 * @var HierarchyTempTableBuilder
+	 */
+	private $hierarchyTempTableBuilder;
+
+	/**
+	 * Array of arrays of executed queries, indexed by the temporary table names
+	 * results were fed into.
+	 *
+	 * @var array
+	 */
+	private $executedQueries = [];
+
+	/**
+	 * Query mode copied from given query. Some submethods act differently when
+	 * in Query::MODE_DEBUG.
+	 *
+	 * @var int
+	 */
+	private $queryMode;
+
+	/**
+	 * @var array
+	 */
+	private $querySegmentList = [];
+
+	/**
+	 * @param Database $connection
+	 * @param TemporaryTableBuilder $temporaryTableBuilder
+	 * @param HierarchyTempTableBuilder $hierarchyTempTableBuilder
+	 */
+	public function __construct( $connection, TemporaryTableBuilder $temporaryTableBuilder, $hierarchyTempTableBuilder ) {
+		$this->connection = $connection;
+		$this->temporaryTableBuilder = $temporaryTableBuilder;
+		$this->hierarchyTempTableBuilder = $hierarchyTempTableBuilder;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return array
+	 */
+	public function getExecutedQueries() {
+		return $this->executedQueries;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param &$querySegmentList
+	 */
+	public function setQuerySegmentList( &$querySegmentList ) {
+		$this->querySegmentList =& $querySegmentList;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param int $queryMode
+	 */
+	public function setQueryMode( $queryMode ) {
+		$this->queryMode = $queryMode;
+	}
+
+	/**
+	 * Process stored queries and change store accordingly. The query obj is modified
+	 * so that it contains non-recursive description of a select to execute for getting
+	 * the actual result.
+	 *
+	 * @param int $id
+	 *
+	 * @throws RuntimeException
+	 */
+	public function process( $id ) {
+		$this->hierarchyTempTableBuilder->emptyHierarchyCache();
+		$this->executedQueries = [];
+
+		// Should never happen
+		if ( !isset( $this->querySegmentList[$id] ) ) {
+			throw new RuntimeException( "$id doesn't exist" );
+		}
+
+		$this->segment( $this->querySegmentList[$id] );
+	}
+
+	private function segment( QuerySegment &$query ) {
+		switch ( $query->type ) {
+			case QuerySegment::Q_TABLE: // .
+				$this->table( $query );
+				break;
+			case QuerySegment::Q_CONJUNCTION:
+				$this->conjunction( $query );
+				break;
+			case QuerySegment::Q_DISJUNCTION:
+				$this->disjunction( $query );
+				break;
+			case QuerySegment::Q_PROP_HIERARCHY:
+			case QuerySegment::Q_CLASS_HIERARCHY: // make a saturated hierarchy
+				$this->hierarchy( $query );
+				break;
+			case QuerySegment::Q_VALUE:
+				break; // nothing to do
+		}
+	}
+
+	/**
+	 * Resolves normal queries with possible conjunctive subconditions
+	 */
+	private function table( QuerySegment &$query ) {
+		foreach ( $query->components as $qid => $joinField ) {
+			$subQuery = $this->querySegmentList[$qid];
+			$this->segment( $subQuery );
+			$alias = $subQuery->alias;
+
+			if ( $subQuery->joinTable !== '' ) { // Join with jointable.joinfield
+				$op = $subQuery->not ? '!' : '';
+
+				$joinType = $subQuery->joinType ? $subQuery->joinType : 'INNER';
+				$t = $this->connection->tableName( $subQuery->joinTable ) . " AS $subQuery->alias";
+				// If the alias is the same as the table name and if there is a prefix, MediaWiki does not declare the unprefixed alias
+				$joinTable = $subQuery->joinTable === $subQuery->alias ? $this->connection->tableName( $subQuery->joinTable ) : $subQuery->joinTable;
+
+				if ( $subQuery->from ) {
+					$t = "($t $subQuery->from)";
+					$alias = 'nested' . $subQuery->alias;
+					$query->fromTables[$alias] = array_merge( (array)$subQuery->fromTables, [ $subQuery->alias => $joinTable ] );
+					$query->joinConditions = array_merge( (array)$query->joinConditions, (array)$subQuery->joinConditions );
+
+				} else {
+					$query->fromTables[$alias] = $joinTable;
+				}
+
+				$query->joinConditions[$alias] = [ $joinType . ' JOIN', "$joinField$op=" . $subQuery->joinfield ];
+
+				$this->fromTables[$subQuery->alias] = $joinTable;
+
+				ksort( $this->fromTables );
+				$this->joinConditions[$subQuery->alias] = [ $joinType . ' JOIN', "$joinField$op=" . $subQuery->joinfield ];
+
+				$query->from .= " $joinType JOIN $t ON $joinField$op=" . $subQuery->joinfield;
+				if ( $joinType === 'LEFT' ) {
+					$query->where .= ( ( $query->where === '' ) ? '' : ' AND ' ) . '(' . $subQuery->joinfield . ' IS NULL)';
+				}
+
+			} elseif ( $subQuery->joinfield !== '' ) { // Require joinfield as "value" via WHERE.
+				$condition = '';
+
+				if ( $subQuery->null === true ) {
+						$condition .= ( $condition ? ' OR ' : '' ) . "$joinField IS NULL";
+				} else {
+					foreach ( $subQuery->joinfield as $value ) {
+						$op = $subQuery->not ? '!' : '';
+						$condition .= ( $condition ? ' OR ' : '' ) . "$joinField$op=" . $this->connection->addQuotes( $value );
+					}
+				}
+
+				if ( count( $subQuery->joinfield ) > 1 ) {
+					$condition = "($condition)";
+				}
+
+				$query->where .= ( ( $query->where === '' || $subQuery->where === null ) ? '' : ' AND ' ) . $condition;
+				$query->from .= $subQuery->from;
+				$query->fromTables = array_merge( (array)$query->fromTables, (array)$subQuery->fromTables );
+				$query->joinConditions = array_merge( (array)$query->joinConditions, (array)$subQuery->joinConditions );
+			} else { // interpret empty joinfields as impossible condition (empty result)
+				$query->joinfield = ''; // make whole query false
+				$query->joinTable = '';
+				$query->where = '';
+				$query->from = '';
+				$query->fromTables = [];
+				$query->joinConditions = [];
+				break;
+			}
+
+			if ( $subQuery->where !== '' && $subQuery->where !== null ) {
+				if ( $subQuery->joinType === 'LEFT' || $subQuery->joinType == 'LEFT OUTER' ) {
+					$query->from .= ' AND (' . $subQuery->where . ')';
+					$query->joinConditions[$alias][1] .= ' AND (' . $subQuery->where . ')';
+				} else {
+					$query->where .= ( ( $query->where === '' ) ? '' : ' AND ' ) . '(' . $subQuery->where . ')';
+				}
+			}
+		}
+
+		$query->components = [];
+	}
+
+	private function conjunction( QuerySegment &$query ) {
+		reset( $query->components );
+		$key = false;
+
+		// Pick one subquery as anchor point ...
+		foreach ( $query->components as $qkey => $qid ) {
+			$key = $qkey;
+
+			if ( $this->querySegmentList[$qkey]->joinTable !== '' ) {
+				break;
+			}
+		}
+
+		$result = $this->querySegmentList[$key];
+		unset( $query->components[$key] );
+
+		// Execute it first (may change jointable and joinfield, e.g. when
+		// making temporary tables)
+		$this->segment( $result );
+
+		// ... and append to this query the remaining queries.
+		foreach ( $query->components as $qid => $joinfield ) {
+			$result->components[$qid] = $result->joinfield;
+		}
+
+		// Second execute, now incorporating remaining conditions.
+		$this->segment( $result );
+
+		$query = $result;
+	}
+
+	private function disjunction( QuerySegment &$query ) {
+		if ( $this->queryMode !== Query::MODE_NONE ) {
+			$this->temporaryTableBuilder->create( $this->connection->tableName( $query->alias ) );
+		}
+
+		$this->executedQueries[$query->alias] = [];
+
+		foreach ( $query->components as $qid => $joinField ) {
+			$subQuery = $this->querySegmentList[$qid];
+			$this->segment( $subQuery );
+			$sql = '';
+
+			if ( $subQuery->joinTable !== '' ) {
+				$sql = 'INSERT ' . 'IGNORE ' . 'INTO ' .
+					   $this->connection->tableName( $query->alias ) .
+					   " SELECT DISTINCT $subQuery->joinfield FROM " . $this->connection->tableName( $subQuery->joinTable ) .
+					   " AS $subQuery->alias $subQuery->from" . ( $subQuery->where ? " WHERE $subQuery->where" : '' );
+			} elseif ( $subQuery->joinfield !== '' ) {
+				// NOTE: this works only for single "unconditional" values without further
+				// WHERE or FROM. The execution must take care of not creating any others.
+				$values = '';
+
+				// This produces an error on postgres with
+				// pg_query(): Query failed: ERROR:  duplicate key value violates
+				// unique constraint "sunittest_t3_pkey" DETAIL:  Key (id)=(274) already exists.
+
+				foreach ( $subQuery->joinfield as $value ) {
+					$values .= ( $values ? ',' : '' ) . '(' . $this->connection->addQuotes( $value ) . ')';
+				}
+
+				$sql = 'INSERT ' . 'IGNORE ' . 'INTO ' . $this->connection->tableName( $query->alias ) . " (id) VALUES $values";
+			} // else: // interpret empty joinfields as impossible condition (empty result), ignore
+
+			if ( $sql ) {
+				$this->executedQueries[$query->alias][] = $sql;
+
+				if ( $this->queryMode !== Query::MODE_NONE ) {
+					$this->connection->query(
+						$sql,
+						__METHOD__,
+						ISQLPlatform::QUERY_CHANGE_ROWS
+					);
+				}
+			}
+		}
+
+		$query->type = QuerySegment::Q_TABLE;
+		$query->where = '';
+		$query->components = [];
+
+		$query->joinTable = $query->alias;
+		$query->joinfield = "$query->alias.id";
+		$query->sortfields = []; // Make sure we got no sortfields.
+
+		// TODO: currently this eliminates sortkeys, possibly keep them (needs
+		// different temp table format though, maybe not such a good thing to do)
+	}
+
+	/**
+	 * Find subproperties or subcategories. This may require iterative computation,
+	 * and temporary tables are used in many cases.
+	 *
+	 * @param QuerySegment &$query
+	 */
+	private function hierarchy( QuerySegment &$query ) {
+		switch ( $query->type ) {
+			case QuerySegment::Q_PROP_HIERARCHY:
+				$type = 'property';
+				break;
+			case QuerySegment::Q_CLASS_HIERARCHY:
+				$type = 'class';
+				break;
+		}
+
+		[ $smwtable, $depth ] = $this->hierarchyTempTableBuilder->getTableDefinitionByType(
+			$type
+		);
+
+		// An individual depth was annotated as part of the query
+		if ( $query->depth !== null ) {
+			$depth = $query->depth;
+		}
+
+		if ( $depth <= 0 ) { // treat as value, no recursion
+			$query->type = QuerySegment::Q_VALUE;
+			return;
+		}
+
+		$values = '';
+		$valuecond = '';
+
+		foreach ( $query->joinfield as $value ) {
+			$values .= ( $values ? ',' : '' ) . '(' . $this->connection->addQuotes( $value ) . ')';
+			$valuecond .= ( $valuecond ? ' OR ' : '' ) . 'o_id=' . $this->connection->addQuotes( $value );
+		}
+
+		// Try to safe time (SELECT is cheaper than creating/dropping 3 temp tables):
+		$res = $this->connection->select(
+			$smwtable,
+			's_id',
+			$valuecond,
+			__METHOD__,
+			[ 'LIMIT' => 1 ]
+		);
+
+		if ( !$res->fetchObject() ) { // no subobjects, we are done!
+			$res->free();
+			$query->type = QuerySegment::Q_VALUE;
+			return;
+		}
+
+		$res->free();
+		$tablename = $this->connection->tableName( $query->alias );
+		$this->executedQueries[$query->alias] = [
+			"Recursively computed hierarchy for element(s) $values.",
+			"SELECT s_id FROM $smwtable WHERE $valuecond LIMIT 1"
+		];
+
+		$query->joinTable = $query->alias;
+		$query->joinfield = "$query->alias.id";
+
+		$this->hierarchyTempTableBuilder->fillTempTable(
+			$type,
+			$tablename,
+			$values,
+			$depth
+		);
+	}
+
+	/**
+	 * After querying, make sure no temporary database tables are left.
+	 *
+	 * @todo I might be better to keep the tables and possibly reuse them later
+	 * on. Being temporary, the tables will vanish with the session anyway.
+	 */
+	public function cleanUp() {
+		foreach ( $this->executedQueries as $table => $log ) {
+			$this->temporaryTableBuilder->drop( $this->connection->tableName( $table ) );
+		}
+	}
+}
diff --git a/formats/datatables/SearchPanes.php b/formats/datatables/SearchPanes.php
index 9c8b47c85..4cdfba65b 100644
--- a/formats/datatables/SearchPanes.php
+++ b/formats/datatables/SearchPanes.php
@@ -17,15 +17,18 @@
 use SMW\DIWikiPage;
 use SMW\Query\PrintRequest;
 use SMW\Services\ServicesFactory as ApplicationFactory;
+use SMW\SQLStore\QueryEngine\HierarchyTempTableBuilder;
 use SMW\SQLStore\QueryEngine\QuerySegment;
 use SMW\SQLStore\QueryEngineFactory;
 use SMW\SQLStore\SQLStore;
 use SMW\SQLStore\TableBuilder\FieldType;
-use SMWDataItem as DataItem;
+use SMW\SQLStore\TableBuilder\TemporaryTableBuilder;
 use SMWQueryProcessor;
 use SRF\DataTables;
 
 class SearchPanes {
+	/** @var DataTables */
+	private $datatables;
 
 	private array $searchPanesLog = [];
 
@@ -33,9 +36,58 @@ class SearchPanes {
 
 	private $connection;
 
-	public function __construct(
-		private DataTables $datatables
-	) {
+	public function __construct( DataTables $datatables ) {
+		$this->datatables = $datatables;
+	}
+
+	private function newTemporaryTableBuilder() {
+		$temporaryTableBuilder = new TemporaryTableBuilder(
+			$this->datatables->store->getConnection( 'mw.db.queryengine' )
+		);
+
+		$temporaryTableBuilder->setAutoCommitFlag(
+			ApplicationFactory::getInstance()->getSettings()->get( 'smwgQTemporaryTablesAutoCommitMode' )
+		);
+
+		return $temporaryTableBuilder;
+	}
+
+	/**
+	 * @see SMW\SQLStore\QueryEngineFactory
+	 * @return QuerySegmentListProcessor
+	 */
+	public function newQuerySegmentListProcessor() {
+		$settings = ApplicationFactory::getInstance()->getSettings();
+
+		$connection = $this->datatables->store->getConnection( 'mw.db.queryengine' );
+		$temporaryTableBuilder = $this->newTemporaryTableBuilder();
+
+		$hierarchyTempTableBuilder = new HierarchyTempTableBuilder(
+			$connection,
+			$temporaryTableBuilder
+		);
+
+		$hierarchyTempTableBuilder->setTableDefinitions(
+			[
+				'property' => [
+					'table' => $this->datatables->store->findPropertyTableID( new DIProperty( '_SUBP' ) ),
+					'depth' => $settings->get( 'smwgQSubpropertyDepth' )
+				],
+				'class' => [
+					'table' => $this->datatables->store->findPropertyTableID( new DIProperty( '_SUBC' ) ),
+					'depth' => $settings->get( 'smwgQSubcategoryDepth' )
+				]
+
+			]
+		);
+
+		$querySegmentListProcessor = new QuerySegmentListProcessor(
+			$connection,
+			$temporaryTableBuilder,
+			$hierarchyTempTableBuilder
+		);
+
+		return $querySegmentListProcessor;
 	}
 
 	public function getSearchPanes( array $printRequests, array $searchPanesOptions ): array {
@@ -117,7 +169,8 @@ private function getPanesOptions(
 		QuerySegment::$qnum = 0;
 		$querySegmentList = $conditionBuilder->getQuerySegmentList();
 
-		$querySegmentListProcessor = $this->queryEngineFactory->newQuerySegmentListProcessor();
+		// $querySegmentListProcessor = $this->queryEngineFactory->newQuerySegmentListProcessor();
+		$querySegmentListProcessor = $this->newQuerySegmentListProcessor();
 
 		$querySegmentListProcessor->setQuerySegmentList( $querySegmentList );
 
@@ -126,30 +179,46 @@ private function getPanesOptions(
 
 		$qobj = $querySegmentList[$rootid];
 
+		$tables = $querySegmentListProcessor->fromTables;
+		$joins = $querySegmentListProcessor->joinConditions;
+
+		$tables[$qobj->alias] = $qobj->joinTable;
+
+		$conds = $qobj->where;
+
 		$property = new DIProperty( DIProperty::newFromUserLabel( $printRequest->getCanonicalLabel() ) );
 		$propTypeid = $property->findPropertyValueType();
 
 		if ( $isCategory ) {
-
 			// data-length without the GROUP BY clause
-			$sql_options = [ 'LIMIT' => 1 ];
+			$sql_options_ = [ 'LIMIT' => 1 ];
+
+			$tables_ = $tables;
+			$tables_['insts'] = 'smw_fpt_inst';
+			$fields_ = [ 'count' => 'COUNT(*)' ];
+			$conds_ = $conds;
+			$joins_ = $joins;
+			$joins_['insts'] = [ 'JOIN', [ "$qobj->alias.smw_id = insts.s_id" ] ];
 
-			$dataLength = (int)$this->connection->selectField(
-				$this->connection->tableName( $qobj->joinTable ) . " AS $qobj->alias" . $qobj->from
-					. ' JOIN ' . $this->connection->tableName( 'smw_fpt_inst' ) . " AS insts ON $qobj->alias.smw_id = insts.s_id",
-				"COUNT(*) AS count",
-				$qobj->where,
+			$res = $this->connection->select(
+				$tables_,
+				$fields_,
+				$conds_,
 				__METHOD__,
-				$sql_options
+				$sql_options_,
+				$joins_
 			);
 
+			$row = $res->fetchRow();
+			$dataLength = (int)( $row['count'] ?? 0 );
+
 			if ( !$dataLength ) {
 				return [];
 			}
 
 			$groupBy = "i.smw_id";
 			$orderBy = "count DESC, $groupBy ASC";
-			$sql_options = [
+			$sql_options_ = [
 				'GROUP BY' => $groupBy,
 				// $this->query->getOption( 'count' ),
 				'LIMIT' => $dataLength,
@@ -167,15 +236,22 @@ private function getPanesOptions(
 			HAVING COUNT(i.smw_id) >= 1 ORDER BY COUNT(i.smw_id) DESC
 			*/
 
+			$tables_ = $tables;
+			$tables_['insts'] = 'smw_fpt_inst';
+			$tables_['i'] = SQLStore::ID_TABLE;
+			$joins_ = $joins;
+			$joins_['insts'] = [ 'JOIN', [ "$qobj->alias.smw_id = insts.s_id" ] ];
+			$joins_['i'] = [ 'JOIN', [ 'i.smw_id = insts.o_id' ] ];
+			$conds_ = $conds;
+			$fields_ = "COUNT($groupBy) AS count, i.smw_id, i.smw_title, i.smw_namespace, i.smw_iw, i.smw_sort, i.smw_subobject";
+
 			$res = $this->connection->select(
-				$this->connection->tableName( $qobj->joinTable ) . " AS $qobj->alias" . $qobj->from
-					// @see https://github.com/SemanticMediaWiki/SemanticDrilldown/blob/master/includes/Sql/SqlProvider.php
-					. ' JOIN ' . $this->connection->tableName( 'smw_fpt_inst' ) . " AS insts ON $qobj->alias.smw_id = insts.s_id"
-					. ' JOIN ' . $this->connection->tableName( SQLStore::ID_TABLE ) . " AS i ON i.smw_id = insts.o_id",
-				"COUNT($groupBy) AS count, i.smw_id, i.smw_title, i.smw_namespace, i.smw_iw, i.smw_sort, i.smw_subobject",
-				$qobj->where,
+				$tables_,
+				$fields_,
+				$conds_,
 				__METHOD__,
-				$sql_options
+				$sql_options_,
+				$joins_
 			);
 
 			$isIdField = true;
@@ -203,25 +279,34 @@ private function getPanesOptions(
 			}
 
 			// data-length without the GROUP BY clause
-			$sql_options = [ 'LIMIT' => 1 ];
+			$sql_options_ = [ 'LIMIT' => 1 ];
 
 			// SELECT COUNT(*) as count FROM `smw_object_ids` AS t0
 			// INNER JOIN (`smw_fpt_mdat` AS t2 INNER JOIN `smw_di_wikipage` AS t3 ON t2.s_id=t3.s_id) ON t0.smw_id=t2.s_id
 			// WHERE ((t3.p_id=517)) LIMIT 500
 
-			$dataLength = (int)$this->connection->selectField(
-				$this->connection->tableName( $qobj->joinTable ) . " AS $qobj->alias" . $qobj->from,
-				"COUNT(*) as count",
-				$qobj->where,
+			$tables_ = $tables;
+			$fields_ = [ 'count' => 'COUNT(*)' ];
+			$conds_ = $conds;
+			$joins_ = $joins;
+
+			$res = $this->connection->select(
+				$tables_,
+				$fields_,
+				$conds_,
 				__METHOD__,
-				$sql_options
+				$sql_options_,
+				$joins_
 			);
 
+			$row = $res->fetchRow();
+			$dataLength = (int)( $row['count'] ?? 0 );
+
 			if ( !$dataLength ) {
 				return [];
 			}
 
-			[ $diType, $isIdField, $fields, $groupBy, $orderBy ] = $this->fetchValuesByGroup( $property, $p_alias, $propTypeid );
+			[ $diType, $isIdField, $fields_, $groupBy, $orderBy ] = $this->fetchValuesByGroup( $property, $p_alias, $propTypeid );
 
 			/*
 			---GENERATED FROM DATATABLES
@@ -231,7 +316,7 @@ private function getPanesOptions(
 			SELECT i.smw_id,i.smw_title,i.smw_namespace,i.smw_iw,i.smw_subobject,i.smw_hash,i.smw_sort,COUNT( p.o_id ) as count FROM `smw_object_ids` `o` INNER JOIN `smw_di_wikipage` `p` ON ((p.s_id=o.smw_id)) JOIN `smw_object_ids` `i` ON ((p.o_id=i.smw_id)) WHERE o.smw_hash IN ('1_-_A','1_-_Ab','1_-_Abc','10_-_Abcd','11_-_Abc') AND (o.smw_iw!=':smw') AND (o.smw_iw!=':smw-delete') AND p.p_id = 517 GROUP BY p.o_id, i.smw_id ORDER BY count DESC, i.smw_sort ASC
 			*/
 
-			$sql_options = [
+			$sql_options_ = [
 				'GROUP BY' => $groupBy,
 				// the following implies that if the user sets a threshold
 				// close or equal to 1, and there are too many unique values,
@@ -243,18 +328,26 @@ private function getPanesOptions(
 			];
 
 			// @see QueryEngine
+			$tables_ = $tables;
+			$joins_ = $joins;
+			$conds_ = $conds;
+
+			if ( $isIdField ) {
+				$tables_['i'] = SQLStore::ID_TABLE;
+				$joins_['i'] = [ 'JOIN', "$p_alias.o_id = i.smw_id" ];
+				$conds_ .= !empty( $conds_ ) ? ' AND' : '';
+				$conds_ .= ' i.smw_iw != ' . $this->connection->addQuotes( SMW_SQL3_SMWIW_OUTDATED );
+				$conds_ .= ' AND i.smw_iw != ' . $this->connection->addQuotes( SMW_SQL3_SMWDELETEIW );
+			}
+
 			$res = $this->connection->select(
-				 $this->connection->tableName( $qobj->joinTable ) . " AS $qobj->alias" . $qobj->from
-				. ( !$isIdField ? ''
-					: " JOIN " . $this->connection->tableName( SQLStore::ID_TABLE ) . " AS `i` ON ($p_alias.o_id = i.smw_id)" ),
-				implode( ',', $fields ),
-				$qobj->where . ( !$isIdField ? '' : ( !empty( $qobj->where ) ? ' AND' : '' )
-					. ' i.smw_iw!=' . $this->connection->addQuotes( SMW_SQL3_SMWIW_OUTDATED )
-					. ' AND i.smw_iw!=' . $this->connection->addQuotes( SMW_SQL3_SMWDELETEIW ) ),
+				$tables_,
+				$fields_,
+				$conds_,
 				__METHOD__,
-				$sql_options
+				$sql_options_,
+				$joins_
 			);
-
 		}
 
 		// verify uniqueRatio
@@ -307,7 +400,6 @@ private function getPanesOptions(
 		$isSubject = false;
 		$groups = [];
 		foreach ( $res as $row ) {
-
 			if ( $isIdField ) {
 				$dbKeys = [
 					$row->smw_title,
@@ -352,9 +444,7 @@ private function getPanesOptions(
 				$dataValue->setOutputFormat( $outputFormat );
 			}
 
-/*
-
-
+		/*
 					//  @see DIBlobHandler
 					// $isKeyword = $dataItem->getOption( 'is.keyword' );
 
@@ -484,7 +574,6 @@ private function getPanesOptions(
 			if ( $uniqueRatio > $threshold ) {
 				return [];
 			}
-
 		}
 
 		arsort( $groups, SORT_NUMERIC );
@@ -619,7 +708,8 @@ private function searchPanesMainlabel( PrintRequest $printRequest, array $search
 		QuerySegment::$qnum = 0;
 		$querySegmentList = $conditionBuilder->getQuerySegmentList();
 
-		$querySegmentListProcessor = $this->queryEngineFactory->newQuerySegmentListProcessor();
+		// $querySegmentListProcessor = $this->queryEngineFactory->newQuerySegmentListProcessor();
+		$querySegmentListProcessor = $this->newQuerySegmentListProcessor();
 
 		$querySegmentListProcessor->setQuerySegmentList( $querySegmentList );
 
@@ -628,7 +718,14 @@ private function searchPanesMainlabel( PrintRequest $printRequest, array $search
 
 		$qobj = $querySegmentList[$rootid];
 
-		$sql_options = [
+		$tables = $querySegmentListProcessor->fromTables;
+		$joins = $querySegmentListProcessor->joinConditions;
+
+		$tables[$qobj->alias] = $qobj->joinTable;
+
+		$conds = $qobj->where;
+
+		$sql_options_ = [
 			// *** should we set a limit here ?
 			// it makes sense to show the pane for
 			// mainlabel only when page titles are grouped
@@ -639,21 +736,29 @@ private function searchPanesMainlabel( PrintRequest $printRequest, array $search
 
 		// Selecting those is required in standard SQL (but MySQL does not require it).
 		$sortfields = implode( ',', $qobj->sortfields );
-		$sortfields = $sortfields ? ',' . $sortfields : '';
+		// $sortfields = $sortfields ? ',' . $sortfields : '';
 
 		// @see QueryEngine
+		$tables_ = $tables;
+		$fields_ = [];
+		$fields_['id'] = "$qobj->alias.smw_id";
+		$fields_['t'] = "$qobj->alias.smw_title";
+		$fields_['ns'] = "$qobj->alias.smw_namespace";
+		$fields_['iw'] = "$qobj->alias.smw_iw";
+		$fields_['so'] = "$qobj->alias.smw_subobject";
+		$fields_['sortkey'] = "$qobj->alias.smw_sortkey";
+		$fields_[] = $sortfields;
+
+		$conds_ = $conds;
+		$joins_ = $joins;
+
 		$res = $this->connection->select(
-			$this->connection->tableName( $qobj->joinTable ) . " AS $qobj->alias" . $qobj->from,
-			"$qobj->alias.smw_id AS id," .
-			"$qobj->alias.smw_title AS t," .
-			"$qobj->alias.smw_namespace AS ns," .
-			"$qobj->alias.smw_iw AS iw," .
-			"$qobj->alias.smw_subobject AS so," .
-			"$qobj->alias.smw_sortkey AS sortkey" .
-			"$sortfields",
-			$qobj->where,
+			$tables_,
+			$fields_,
+			$conds_,
 			__METHOD__,
-			$sql_options
+			$sql_options_,
+			$joins_
 		);
 
 		$diHandler = $this->datatables->store->getDataItemHandlerForDIType(
diff --git a/i18n/ar.json b/i18n/ar.json
index 8760725b4..37df76454 100644
--- a/i18n/ar.json
+++ b/i18n/ar.json
@@ -205,6 +205,7 @@
 	"srf-ui-datatables-label-filters": "المرشحات",
 	"srf-ui-datatables-label-information": "معلومات",
 	"srf-ui-datatables-panel-disclaimer": "يمكن تغيير الوسائط والشروط، ولكن أي تغيير مؤقت ويتم التخلي عنه بعد تحديث الصفحة.",
+	"srf-ui-datatables-refresh-button-title": "تحديث الجدول",
 	"srf-ui-datatables-label-update-success": "تم تحديث الجدول بنجاح",
 	"srf-ui-datatables-label-update-error": "فشل تحديث الجدول.",
 	"srf-ui-datatables-label-placeholder-column-search": "بحث...",
@@ -229,6 +230,7 @@
 	"srf-ui-datatables-label-oPaginate-sPrevious": "السابق",
 	"srf-ui-datatables-label-oAria-sSortAscending": ": تفعيل لفرز العمود تصاعديا",
 	"srf-ui-datatables-label-oAria-sSortDescending": ": تفعيل لفرز العمود تنازليا",
+	"srf-ui-datatables-label-rows": "{{PLURAL:$1| صف|$1 صفوف|$1 صف}}",
 	"srf-ui-datatables-label-rows-all": "كل الصفوف",
 	"srf-printername-tree": "زود بعمود",
 	"srf-printername-ultree": "Ultree",
@@ -356,5 +358,6 @@
 	"srf-printername-gantt": "جانت",
 	"srf-paramdesc-nodelabel": "استخدام تسمية عقدة الرسم البياني، القيم المسموح بها: عنوان العرض.",
 	"srf-printername-mode": "وضع",
-	"srf-printername-range": "النطاق"
+	"srf-printername-range": "النطاق",
+	"srf-printername-variance": "التباين"
 }
diff --git a/i18n/de-formal.json b/i18n/de-formal.json
deleted file mode 100644
index 2e30633f9..000000000
--- a/i18n/de-formal.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-	"@metadata": {
-		"authors": [
-			"Kghbln"
-		]
-	},
-	"srf-prefs-intro-text": "Die Erweiterung „Semantic Result Formats“ ist installiert. Besuchen Sie bitte die [https://www.semantic-mediawiki.org/wiki/Help:Ergebnisformate Hilfeseite zu Ergebnisformaten] für weitere Informationen.",
-	"srf-ui-common-label-ajax-error": "Der Server meldete eine fehlgeschlagene Kommunikation für diesen $1. Bitte versuchen Sie, die Seite neu zu laden oder wenden Sie sich an $2."
-}
diff --git a/i18n/vi.json b/i18n/vi.json
index 6a38556f9..ca030661c 100644
--- a/i18n/vi.json
+++ b/i18n/vi.json
@@ -29,12 +29,9 @@
 	"srf-paramdesc-pagelength": "Xác định độ dài trang",
 	"srf-paramdesc-lengthmenu": "Xác định độ dài menu",
 	"srf-paramdesc-datatables-columnstype": "Xác định loại cột dữ liệu",
-	"srf_printername_carousel": "băng chuyền",
 	"srf-gallery-navigation-previous": "Trước",
 	"srf-gallery-navigation-next": "Tiếp theo",
 	"srf-paramdesc-graphname": "Đặt tiêu đề của biểu đồ",
-	"srf-ui-datatables-refresh-button-title": "làm mới bảng",
-	"srf-ui-datatables-panel-switch-button-title": "bảng chuyển đổi",
 	"srf-filtered-noscript-error": "Không thể hiển thị kết quả vì JavaScript chưa được bật. Chuyển đến $1 .",
 	"srf-paramdesc-carousel-class": "Chỉ định lớp CSS cho băng chuyền",
 	"srf-paramdesc-carousel-width": "Chỉ định chiều rộng của băng chuyền",
@@ -43,7 +40,5 @@
 	"srf-paramdesc-carousel-titleproperty": "Chỉ định tên của thuộc tính ngữ nghĩa có trên các trang được truy vấn để sử dụng làm tiêu đề",
 	"srf-paramdesc-carousel-linkproperty": "Chỉ định tên của thuộc tính ngữ nghĩa có trên các trang được truy vấn để sử dụng cho các liên kết",
 	"srf-paramdesc-carousel-imageproperty": "Chỉ định tên của thuộc tính ngữ nghĩa có trên các trang được truy vấn để sử dụng cho hình ảnh",
-	"srf-paramdesc-carousel-slick-option": "Chỉ định xem băng chuyền có nên sử dụng các tùy chọn được cung cấp bởi 'Slick' hay không",
-	"srf-ui-slideshow-slide-button-play": "chơi",
-	"srf-ui-slideshow-slide-button-pause": "tạm ngừng"
+	"srf-paramdesc-carousel-slick-option": "Chỉ định xem băng chuyền có nên sử dụng các tùy chọn được cung cấp bởi 'Slick' hay không"
 }