WIP: versioned backref

src/main/java/org/caosdb/server/query/Backreference.java

@@ -113,7 +113,7 @@ public class Backreference implements EntityFilterInterface, QueryInterface {
       initBackRef(query);
 
       final CallableStatement callApplyBackRef =
-          getConnection().prepareCall("call applyBackReference(?,?,?,?,?)");
+          getConnection().prepareCall("call applyBackReference(?,?,?,?,?,?)");
       callApplyBackRef.setString(1, getSourceSet()); // sourceSet
       this.statistics.put("sourceSet", getSourceSet());
       this.statistics.put(
@@ -145,6 +145,7 @@ public class Backreference implements EntityFilterInterface, QueryInterface {
         callApplyBackRef.setNull(4, VARCHAR);
       }
       callApplyBackRef.setBoolean(5, hasSubProperty()); // subQuery?
+      callApplyBackRef.setBoolean(6, this.isVersioned());
 
       executeStmt(query, callApplyBackRef);
       callApplyBackRef.close();
@@ -210,7 +211,6 @@ public class Backreference implements EntityFilterInterface, QueryInterface {
           this.statistics.put(
               "subPropertySourceSetCount", Utils.countTable(query.getConnection(), this.sourceSet));
           this.targetSet = null;
-          getSubProperty().getFilter().apply(this);
 
           final long t3 = System.currentTimeMillis();
           try (final PreparedStatement callFinishSubProperty =
@@ -324,6 +324,6 @@ public class Backreference implements EntityFilterInterface, QueryInterface {
 
   @Override
   public boolean isVersioned() {
-    return false;
+    return this.query.isVersioned();
   }
 }

src/main/java/org/caosdb/server/query/SubProperty.java

@@ -165,7 +165,11 @@ public class SubProperty implements QueryInterface, EntityFilterInterface {
 
   @Override
   public boolean isVersioned() {
-    // TODO Auto-generated method stub
-    return false;
+    boolean is_versioned = this.query.isVersioned();
+    if (is_versioned) {
+      throw new QueryException(
+          "Versioned queries are not supported for subqueries yet. Please file a feature request.");
+    }
+    return is_versioned;
   }
 }