1.1 --- a/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Mon Sep 22 13:34:35 2014 +0300
     1.2 +++ b/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Mon Sep 22 14:12:58 2014 +0300
     1.3 @@ -308,7 +308,7 @@
     1.4  		
     1.5  		// function call with 2 or more arguments, evaluate the second one now
     1.6  		// see distance function as example
     1.7 -		if ( fc.getArgs().size() > 2 )
     1.8 +		if ( fc.getArgs().size() >= 2 )
     1.9  		{
    1.10  			ValueExpr right = fc.getArgs().get(1);
    1.11  			rightResult = evaluate(right, bindings);
    1.12 @@ -502,7 +502,7 @@
    1.13  		StrabonPolyhedron leftArg = getValueAsStrabonPolyhedron(left);
    1.14  		if(function.getURI().equals(GeoConstants.stSPARQLunion))
    1.15  		{
    1.16 -			StrabonPolyhedron rightArg = ((GeneralDBPolyhedron) right).getPolyhedron();
    1.17 +			StrabonPolyhedron rightArg = getValueAsStrabonPolyhedron(right);
    1.18  			return StrabonPolyhedron.union(leftArg, rightArg);
    1.19  		}
    1.20  		else if (function instanceof BufferFunc) {
    1.21 @@ -556,17 +556,17 @@
    1.22  		}
    1.23  		else if(function.getURI().equals(GeoConstants.stSPARQLintersection))
    1.24  		{
    1.25 -			StrabonPolyhedron rightArg = ((GeneralDBPolyhedron) right).getPolyhedron();
    1.26 +			StrabonPolyhedron rightArg = getValueAsStrabonPolyhedron(right);
    1.27  			return StrabonPolyhedron.intersection(leftArg, rightArg);
    1.28  		}
    1.29  		else if(function.getURI().equals(GeoConstants.stSPARQLdifference))
    1.30  		{
    1.31 -			StrabonPolyhedron rightArg = ((GeneralDBPolyhedron) right).getPolyhedron();
    1.32 +			StrabonPolyhedron rightArg = getValueAsStrabonPolyhedron(right);
    1.33  			return StrabonPolyhedron.difference(leftArg, rightArg);		
    1.34  		}
    1.35  		else if(function.getURI().equals(GeoConstants.stSPARQLsymDifference))
    1.36  		{
    1.37 -			StrabonPolyhedron rightArg = ((GeneralDBPolyhedron) right).getPolyhedron();
    1.38 +			StrabonPolyhedron rightArg = getValueAsStrabonPolyhedron(right);
    1.39  			return StrabonPolyhedron.symDifference(leftArg, rightArg);
    1.40  			
    1.41  		} else if (function instanceof Centroid) {

     2.1 --- a/generaldb/src/main/java/org/openrdf/sail/generaldb/optimizers/GeneralDBSelectQueryOptimizer.java	Mon Sep 22 13:34:35 2014 +0300
     2.2 +++ b/generaldb/src/main/java/org/openrdf/sail/generaldb/optimizers/GeneralDBSelectQueryOptimizer.java	Mon Sep 22 14:12:58 2014 +0300
     2.3 @@ -996,13 +996,14 @@
     2.4  			GeneralDBSqlExpr sqlExpr = null;
     2.5  			String name = elem.getName();
     2.6  			
     2.7 -			if(expr instanceof FunctionCall && !isFuncExprGrounded(expr))
     2.8 +			//if (expr instanceof FunctionCall)
     2.9 +			if (expr instanceof FunctionCall && !isFuncExprGrounded(expr))
    2.10  			{ // if the expr is grounded we are going to evaluate it in Java 
    2.11  				if(!evaluateInJava(expr))
    2.12  				{
    2.13  					Function function = FunctionRegistry.getInstance().get(((FunctionCall) expr).getURI());
    2.14 -					if(function instanceof SpatialPropertyFunc || function instanceof SpatialRelationshipFunc 
    2.15 -							|| function instanceof SpatialConstructFunc || function instanceof SpatialMetricFunc)
    2.16 +					if(function instanceof SpatialPropertyFunc  || function instanceof SpatialRelationshipFunc ||
    2.17 +					   function instanceof SpatialConstructFunc || function instanceof SpatialMetricFunc)
    2.18  					{
    2.19  						try {
    2.20  							sqlExpr = sql.getBooleanExprFactory().spatialFunction((FunctionCall) expr);