Can not redirct stderr in chdb.query()

[laodouya]

Describe the unexpected behaviour In version above 0.10, chdb.query() will print error message in stderr. But it can not redirct or catch into variable.

How to reproduce

import chdb
from io import StringIO
import sys
from contextlib import redirect_stderr

f = StringIO()
with redirect_stderr(f):
    res = chdb.query("select 1", "csv")
    # sys.stderr.write("write stderr in python")
err = f.getvalue()

print("Capture err by redirect_stderr: ", err)

Expected behavior Error msg catched and stored into err variable

[laodouya]

Use https://github.com/minrk/wurlitzer can catch it.

from wurlitzer import pipes

with pipes() as (out, err):
    res = chdb.query("select 1", "csv")

errmsg = err.read()

[laodouya]

Or use

pipe_out, pipe_in = os.pipe()
os.dup2(pipe_in, 2)

to replace stderr fd temporarily

[auxten]

It seems the wurlitzer created a new process to do that. I will fix it in chdb C++ after my "rebasing to 23.6" is finished.

[lmangani]

Can we close this issue or is it still applicable to 0.11.4?

[auxten]

Still to be fixed

[auxten]

Fixed #105