Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ExprManagerUtil.java
}
				if ( l != null )
				{
					for ( int j = 0; j < l.size( ); j++ )
					{
						checkColumnBindingExist( l.get( j ).toString( ), list );
					}
				}
				List usedBindings = null;
				if ( expr instanceof IScriptExpression )
				{
					try
					{
						usedBindings = ExpressionUtil.extractColumnExpressions( ( (IScriptExpression) expr ).getText( ),
								true );
					}
					catch ( BirtException e )
					{
						continue;
					}
					validateReferredColumnBinding( name,
							usedBindings,
							baseQueryDefn );
				}
			}
		}
	}
	
	/**