Custom Sorting error

Hello cuba team. I have problem with CustomSortExpressionProvider example implementation (https://doc.cuba-platform.com/manual-latest/gui_data_comp_sort.html)
public class ClientCodeSortExpressionProvider extends DefaultJpqlSortExpressionProvider {

@Override
public String getDatatypeSortExpression(MetaPropertyPath metaPropertyPath, boolean sortDirectionAsc) {
    if (metaPropertyPath.getMetaClass().getJavaClass().equals(Client.class)
            && "clientCode".equals(metaPropertyPath.toPathString())) {
        String expression = String.format("TRY_CAST({E}.%s BIGINT)", metaPropertyPath.toString());
         return String.format("**TRY_CAST**({E}.%s  BIGINT)", metaPropertyPath.toString());
    }
    return String.format("{E}.%s", metaPropertyPath.toString());
}

}
Why if i’m using TRY_CAST i’m getting error:

com.haulmont.cuba.core.global.RemoteException:

java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Problem compiling [select e from psierserp_Client e order by TRY_CAST, e.id].
[42, 50] The identification variable ‘TRY_CAST’ is not defined in the FROM clause.

org.eclipse.persistence.exceptions.JPQLException:
Exception Description: Problem compiling [select e from psierserp_Client e order by TRY_CAST, e.id].
[42, 50] The identification variable ‘TRY_CAST’ is not defined in the FROM clause.
at com.haulmont.cuba.core.sys.ServiceInterceptor.aroundInvoke(ServiceInterceptor.java:96)
at jdk.internal.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy221.loadList(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.haulmont.cuba.core.sys.remoting.LocalServiceInvokerImpl.invoke(LocalServiceInvokerImpl.java:94)
at com.haulmont.cuba.web.sys.remoting.LocalServiceProxy$LocalServiceInvocationHandler.invoke(LocalServiceProxy.java:159)
at com.sun.proxy.$Proxy34.loadList(Unknown Source)
at com.haulmont.cuba.client.sys.DataManagerClientImpl.loadList(DataManagerClientImpl.java:57)
at com.haulmont.cuba.gui.model.impl.CollectionLoaderImpl.load(CollectionLoaderImpl.java:107)
at com.haulmont.cuba.gui.model.impl.ScreenDataImpl.loadAll(ScreenDataImpl.java:80)
at com.haulmont.cuba.gui.model.impl.AnnotationBasedLoaderBeforeShow.loadData(AnnotationBasedLoaderBeforeShow.java:36)
at com.haulmont.cuba.web.sys.WebScreens.loadDataBeforeShow(WebScreens.java:554)
at com.haulmont.cuba.web.sys.WebScreens.show(WebScreens.java:446)
at com.haulmont.cuba.web.sys.WebScreens.showFromNavigation(WebScreens.java:550)
at com.haulmont.cuba.gui.config.MenuItemCommands$ScreenCommand.run(MenuItemCommands.java:338)
at com.haulmont.cuba.web.sys.SideMenuBuilder$MenuCommandExecutor.accept(SideMenuBuilder.java:264)
at com.haulmont.cuba.web.sys.SideMenuBuilder$MenuCommandExecutor.accept(SideMenuBuilder.java:249)
at com.haulmont.cuba.web.gui.components.mainwindow.WebSideMenu$MenuItemImpl.menuSelected(WebSideMenu.java:576)
at com.haulmont.cuba.web.widgets.CubaSideMenu$1.menuItemTriggered(CubaSideMenu.java:90)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:153)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:115)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:431)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:396)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:260)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:82)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1578)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:425)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.serviceAppRequest(CubaApplicationServlet.java:329)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.service(CubaApplicationServlet.java:215)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
at com.haulmont.cuba.web.sys.CubaHttpFilter.doFilter(CubaHttpFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:829)

See “Function Invocation” here: JPQL Functions for how to use SQL functions in JPQL.