in jdbc-grpc-client/src/main/java/org/apache/kyuubi/grpc/client/SimpleBlockingJdbcClient.java [324:331]
public DirectStatusResp setCatalog(String connectionId, String catalog) {
SetCatalogReq.Builder builder = SetCatalogReq.newBuilder();
SetCatalogReq req = builder
.setConnectionId(ConnectionHandle.newBuilder().setId(connectionId).build())
.setCatalog(catalog)
.build();
return connectionBlockingStub.setCatalog(req);
}