[Bug] Failed to load data with singlenode mode using `insert into ... select ...`

[zhangyue-hashdata]

Apache Cloudberry version

No response

What happened

postgres=# CREATE TABLE t1 (c1 int) with (appendonly=true, orientation=column);
CREATE TABLE
postgres=# CREATE EXTERNAL TABLE ext_t1 (like t1)
postgres-# LOCATION ('file://hashdata/home/gpadmin/data/data/tpcds10s/t1.dat')
postgres-# FORMAT 'TEXT' (DELIMITER '|' NULL AS '' ESCAPE AS E'\\');
CREATE EXTERNAL TABLE
postgres=# insert into t1 select * from ext_t1;
ERROR:  'ON COORDINATOR' is not supported by this protocol yet

What you think should happen instead

No response

How to reproduce

postgres=# CREATE TABLE t1 (c1 int) with (appendonly=true, orientation=column);
CREATE TABLE
postgres=# CREATE EXTERNAL TABLE ext_t1 (like t1)
postgres-# LOCATION ('file://hashdata/home/gpadmin/data/data/tpcds10s/t1.dat')
postgres-# FORMAT 'TEXT' (DELIMITER '|' NULL AS '' ESCAPE AS E'\\');
CREATE EXTERNAL TABLE
postgres=# insert into t1 select * from ext_t1;
ERROR:  'ON COORDINATOR' is not supported by this protocol yet

Operating System

Linux

Anything else

No response

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct.

[github-actions]

Hi, @zhangyue-hashdata welcome!🎊 Thanks for taking the time to point this out.🙌

[avamingli]

postgres=# CREATE TABLE t1 (c1 int) with (appendonly=true, orientation=column);
CREATE TABLE
postgres=# CREATE EXTERNAL TABLE ext_t1 (like t1)
postgres-# LOCATION ('file://hashdata/home/gpadmin/data/data/tpcds10s/t1.dat')
postgres-# FORMAT 'TEXT' (DELIMITER '|' NULL AS '' ESCAPE AS E'\');
CREATE EXTERNAL TABLE
postgres=# insert into t1 select * from ext_t1;
ERROR: 'ON COORDINATOR' is not supported by this protocol yet

This is expected.

The file protocol is not supported on the master node. In a single-node deployment, CBDB operates similarly to a single master node.

Recommended Solutions:

1. Use the COPY command to import files when working on the master node or in single-node mode.
2. If you must use a protocol, consider implementing a custom protocol instead.
   Reference: contrib/extprotocol