in jdbc-grpc-client/src/main/java/org/apache/kyuubi/grpc/client/SimpleBlockingJdbcClient.java [138:145]
public DirectStatusResp setSchema(String connectionId, String schema) {
SetSchemaReq.Builder builder = SetSchemaReq.newBuilder();
SetSchemaReq req = builder
.setConnectionId(ConnectionHandle.newBuilder().setId(connectionId).build())
.setSchema(schema)
.build();
return connectionBlockingStub.setSchema(req);
}