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Pandas makes bad DESCRIBE query when using SQLAlchemy

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#184 4 comments 0 reactions 1 assignee View on GitHub

@susodapop is already working on this.

Since Aug 3, 2023.

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Description

bug sqlalchemy

When using the SQLAlchemy engine with Pandas, it seems that Pandas makes a bad DESCRIBE query. Here is the code:

import os

import pandas as pd

from sqlalchemy import create_engine


server_hostname = os.getenv("DATABRICKS_SERVER_HOSTNAME")
http_path = os.getenv("DATABRICKS_HTTP_PATH")
access_token = os.getenv("DATABRICKS_TOKEN")
engine = create_engine(
    f"databricks://token:{access_token}@{server_hostname}?http_path={http_path}&catalog=hive_metastore&schema=default",
)
with engine.connect() as connection:
    print(pd.read_sql("SELECT * FROM test", connection))

Here are the two query resulting from that code:
image

It does not do that when using SQL connector instead:

import os

import pandas as pd

from databricks import sql


with sql.connect(
    server_hostname=os.getenv("DATABRICKS_SERVER_HOSTNAME"),
    http_path=os.getenv("DATABRICKS_HTTP_PATH"),
    access_token=os.getenv("DATABRICKS_TOKEN"),
) as connection:
    print(pd.read_sql("SELECT * FROM test", connection))

Here are version numbers:

In [1]: import sqlalchemy

In [2]: sqlalchemy.__version__
Out[2]: '1.4.49'

In [3]: from databricks import sql

In [4]: sql.__version__
Out[4]: '2.8.0'
Dominant language
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