[Bug] orca incorrectly executes functions on QD

[lss602726449]

Apache Cloudberry version

main

What happened

-- change /home/gpadmin/cloudberry/src/test/regress/regress.so to your local path
CREATE FUNCTION test_enc_conversion(bytea, name, name, bool, validlen OUT int, result OUT bytea)
    AS '**/home/gpadmin/cloudberry/src/test/regress/regress.so**', 'test_enc_conversion'
    LANGUAGE C STRICT;

create or replace function test_conv(
  input IN bytea,
  src_encoding IN text,
  dst_encoding IN text,
  result OUT bytea,
  errorat OUT bytea,
  error OUT text)
language plpgsql as
$$
declare
  validlen int;
begin
  -- First try to perform the conversion with noError = false. If that errors out,
  -- capture the error message, and try again with noError = true. The second call
  -- should succeed and return the position of the error, return that too.
  begin
    select * into validlen, result from test_enc_conversion(input, src_encoding, dst_encoding, false);
    errorat = NULL;
    error := NULL;
  exception when others then
    error := sqlerrm;
    select * into validlen, result from test_enc_conversion(input, src_encoding, dst_encoding, true);
    errorat = substr(input, validlen + 1);
  end;
  return;
end;
$$;

CREATE TABLE utf8_verification_inputs (inbytes bytea, description text PRIMARY KEY);
insert into utf8_verification_inputs  values
  ('\x66006f',	'NUL byte'),
  ('\xaf',		'bare continuation'),
  ('\xc5',		'missing second byte in 2-byte char'),
  ('\xc080',	'smallest 2-byte overlong'),
  ('\xc1bf',	'largest 2-byte overlong'),
  ('\xc280',	'next 2-byte after overlongs'),
  ('\xdfbf',	'largest 2-byte'),
  ('\xe9af',	'missing third byte in 3-byte char'),
  ('\xe08080',	'smallest 3-byte overlong'),
  ('\xe09fbf',	'largest 3-byte overlong'),
  ('\xe0a080',	'next 3-byte after overlong'),
  ('\xed9fbf',	'last before surrogates'),
  ('\xeda080',	'smallest surrogate'),
  ('\xedbfbf',	'largest surrogate'),
  ('\xee8080',	'next after surrogates'),
  ('\xefbfbf',	'largest 3-byte'),
  ('\xf1afbf',	'missing fourth byte in 4-byte char'),
  ('\xf0808080',	'smallest 4-byte overlong'),
  ('\xf08fbfbf',	'largest 4-byte overlong'),
  ('\xf0908080',	'next 4-byte after overlong'),
  ('\xf48fbfbf',	'largest 4-byte'),
  ('\xf4908080',	'smallest too large'),
  ('\xfa9a9a8a8a',	'5-byte');
-- Test UTF-8 verification slow path
select description, (test_conv(inbytes, 'utf8', 'utf8')).* from utf8_verification_inputs;

ERROR:  query plan with multiple segworker groups is not supported
HINT:  likely caused by a function that reads or modifies data in a distributed table
CONTEXT:  PL/pgSQL function test_conv(bytea,text,text) line 8 during statement block entry

postgres=# explain select description, (test_conv(inbytes, 'utf8', 'utf8')).* from utf8_verification_inputs;
                                      QUERY PLAN                                       
---------------------------------------------------------------------------------------
 Result  (cost=0.00..431.00 rows=1 width=32)
   ->  Gather Motion 3:1  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=16)
         ->  Seq Scan on utf8_verification_inputs  (cost=0.00..431.00 rows=1 width=16)
 Optimizer: GPORCA
(4 rows)

postgres=# set optimizer = off;
SET
postgres=# explain select description, (test_conv(inbytes, 'utf8', 'utf8')).* from utf8_verification_inputs;
                                      QUERY PLAN                                       
---------------------------------------------------------------------------------------
 Gather Motion 3:1  (slice1; segments: 3)  (cost=0.00..9314.00 rows=34800 width=128)
   ->  Seq Scan on utf8_verification_inputs  (cost=0.00..8850.00 rows=11600 width=128)
 Optimizer: Postgres query optimizer
(3 rows)

It seems that ORCA executes functions on QD, but PG executes them directly on QE.

What you think should happen instead

No response

How to reproduce

see before

Operating System

rockylinux

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.