[BUG]] [GPU Error Bug] "SELECT (CASE false WHEN (true) THEN (true) WHEN false THEN false END ), ('<string>'), false FROM <table>" brings Error

[qwebug]

What happened:

"SELECT (CASE false WHEN (true) THEN (true) WHEN false THEN false END ), ('<string>'), false FROM <table>" brings error, when using GPU.

However it is able to output result, when using CPU.

What you expected to happen:

It will not bring error, when using GPU.

Minimal Complete Verifiable Example:

import pandas as pd
import dask.dataframe as dd
from dask_sql import Context

c = Context()

df0 = pd.DataFrame({
    'c0': [835.0000],
})
t0 = dd.from_pandas(df0, npartitions=1)

c.create_table('t0', t0, gpu=False)
c.create_table('t0_gpu', t0, gpu=True)

print('CPU Result:')
result1= c.sql("SELECT (CASE false WHEN (true) THEN (true) WHEN false THEN false END ), ('A'), false FROM t0").compute()
print(result1)

print('GPU Result:')
result2= c.sql("SELECT (CASE false WHEN (true) THEN (true) WHEN false THEN false END ), ('A'), false FROM t0_gpu").compute()
print(result2)

Result:

INFO:numba.cuda.cudadrv.driver:init
CPU Result:
   CASE Boolean(false) WHEN Boolean(true) THEN Boolean(true) WHEN Boolean(false) THEN Boolean(false) END Utf8("A")  Boolean(false)
0                                              False                                                             A           False
GPU Result:
Traceback (most recent call last):
  File "/tmp/bug.py", line 20, in <module>
    result2= c.sql("SELECT (CASE false WHEN (true) THEN (true) WHEN false THEN false END ), ('A'), false FROM t0_gpu").compute()
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask_sql/context.py", line 513, in sql
    return self._compute_table_from_rel(rel, return_futures)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask_sql/context.py", line 869, in _compute_table_from_rel
    df = dc.assign()
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask_sql/datacontainer.py", line 229, in assign
    df.columns = self.column_container.columns
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask/dataframe/core.py", line 4887, in __setattr__
    object.__setattr__(self, key, value)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask/dataframe/core.py", line 4746, in columns
    renamed = _rename_dask(self, columns)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask/dataframe/core.py", line 7084, in _rename_dask
    metadata = _rename(names, df._meta)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/dask/dataframe/core.py", line 7055, in _rename
    df.columns = columns
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/cudf/core/dataframe.py", line 1094, in __setattr__
    super().__setattr__(key, col)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/nvtx/nvtx.py", line 101, in inner
    result = func(*args, **kwargs)
  File "/opt/conda/envs/rapids/lib/python3.10/site-packages/cudf/core/dataframe.py", line 2473, in columns
    raise ValueError(
ValueError: Length mismatch: expected 2 elements, got 3 elements

Anything else we need to know?:

Environment:

• dask-sql version: 2023.6.0
• Python version: Python 3.10.11
• Operating System: Ubuntu22.04
• Install method (conda, pip, source): Docker deploy by https://hub.docker.com/layers/rapidsai/rapidsai-dev/23.06-cuda11.8-devel-ubuntu22.04-py3.10/images/sha256-cfbb61fdf7227b090a435a2e758114f3f1c31872ed8dbd96e5e564bb5fd184a7?context=explore