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/impl/ServiceForQueryResults.java
{
						result = result || popAggrRefFromBaseExpr( aggrReferences,
								this.getBinding( ( (IColumnBinding) usedRowReferences.get( i ) ).getResultSetColumnName( ) )
										.getExpression( ),
								aggrMap );
					}
				}
				return result;
			}
			catch ( BirtException be )
			{
				throw DataException.wrap( be );
			}
		}
		
		/**
		 * 
		 * @param expr
		 * @return
		 * @throws DataException
		 */
		private boolean isConstantExpr( IBaseExpression expr )
				throws DataException
		{
			if ( !( expr instanceof IScriptExpression ) )
				return false;
			try
			{
				return ExpressionUtil.extractColumnExpressions( ( (IScriptExpression) expr ).getText( ) )
						.isEmpty( )