public void execSetSession( Session session, LogicalPlan plan, SubmitQueryResponse.Builder response) { SetSessionNode setSessionNode = ((LogicalRootNode) plan.getRootBlock().getRoot()).getChild(); final String varName = setSessionNode.getName(); // SET CATALOG 'XXX' if (varName.equals(SessionVars.CURRENT_DATABASE.name())) { String databaseName = setSessionNode.getValue(); if (catalog.existDatabase(databaseName)) { session.selectDatabase(setSessionNode.getValue()); } else { response.setQueryId(QueryIdFactory.NULL_QUERY_ID.getProto()); response.setState(errUndefinedDatabase(databaseName)); } // others } else { if (setSessionNode.hasValue()) { session.setVariable(varName, setSessionNode.getValue()); } else { session.removeVariable(varName); } } response.setQueryId(QueryIdFactory.NULL_QUERY_ID.getProto()); response.setState(OK); }