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
boolean base = false;
			
			for( int i = 0; i < result.length; i++ )
			{
				if ( isConstantExpr((IBaseExpression)exprs.get(i)))
				{
					continue;
				}
				base = result[i];
				break;
			}
			
			for( int i = 0; i < result.length; i++ )
			{
				if ( isConstantExpr((IBaseExpression)exprs.get(i)))
				{
					continue;
				}
				
				if( result[i] != base )
					throw new DataException( ResourceConstants.INVALID_NESTED_AGGR_GROUP );
			}
			return result.length == 0?false:base;
		}
		
		/**
		 * 
		 * @param aggrReferences
		 * @param expr
		 * @param aggrMap