join not supported?

[NetGH]

We tried join statement, (regardless stream-table join, stream-stream join, table-table join) but always failed with the following error log.
we used the docker version of KSQL.

io.confluent.ksql.parser.KsqlParser.buildAst(KsqlParser.java:62)
io.confluent.ksql.KsqlEngine.getStatements(KsqlEngine.java:331)
io.confluent.ksql.rest.server.StatementParser.parseSingleStatement(StatementParser.java:32)
io.confluent.ksql.rest.server.resources.streaming.StreamedQueryResource.streamQuery(StreamedQueryResource.java:66)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)
org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
org.glassfish.jersey.internal.Errors.process(Errors.java:315)
org.glassfish.jersey.internal.Errors.process(Errors.java:297)
org.glassfish.jersey.internal.Errors.process(Errors.java:267)
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)
org.glassfish.jersey.servlet.ServletContainer.serviceImpl(ServletContainer.java:408)
org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:583)
org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:524)
org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:461)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:159)
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
org.eclipse.jetty.server.Server.handle(Server.java:499)
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:258)
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
java.lang.Thread.run(Thread.java:745)
(io.confluent.ksql.cli.console.Console:130)

[NetGH]

actually, it's caused by KSQL doesn't support table , stream alias