Bug 200755 [smoke]Fail to preview Crosstab after deploy BIRT in application servers.[0601][1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/AbstractExpressionCompiler.java
case Token.NULL :
				compiledExpr = new ConstantExpression( );
				break;
			case Token.TRUE :
				compiledExpr = new ConstantExpression( true );
				break;
			case Token.FALSE :
				compiledExpr = new ConstantExpression( false );
				break;
			case Token.GETPROP :
			{
				ConstantExpression ce = AggregationConstantsUtil.getConstantExpression( child );
				if ( ce != null )
				{
					compiledExpr = ce;
					break;
				}
			}
			case Token.GETELEM :
				compiledExpr = compileDirectColRefExpr( parent,
						child,
						grandFather,
						customerChecked,
						context );
				break;
			case Token.CALL :
			{
				compiledExpr = compileAggregateExpr( context, parent, child );
				break;
			}