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Set argument for redshift connection/cursor in order to fetch float instances?

See original GitHub issue

Driver version

2.0.905

Redshift version

PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.36224��

Client Operating System

Darwin Nativs-MacBook-Pro.local 21.4.0 Darwin Kernel Version 21.4.0: Mon Feb 21 20:34:37 PST 2022; root:xnu-8020.101.4~2/RELEASE_X86_64 x86_64

Python version

3.8.7

Problem description

I was wondering if there is some kind of a flag / setting I can set in order to tell the connector return a numeric result as float / np.float instead of decimal.Decimal instance?

I was using the following raw sql on a cursor instance:

cursor.execute("SELECT 1.0 / 7 AS foo")
df = cursor.fetch_dataframe()
output = df.squeeze()
assert not isinstance(output, decimal.Decimal)

Thanks in advance!

Issue Analytics

State:
Created 2 years ago
Comments:5 (3 by maintainers)

Top GitHub Comments

2reactions

Brooke-whitecommented, Mar 28, 2022

Hi @ni-todo-spot ,

Small update – I’ve scoped work required for this feature and it looks minimal. I’m working on implementation/testing and anticipate we can include this feature in our next release (scheduled for mid-April). At this time, I think supporting an option for returning a numeric as float would be most straight forward.

2reactions

Brooke-whitecommented, Mar 21, 2022

Hey @ni-todo-spot ,

Thanks for reaching out, this is a good question. At this time, all NUMERIC values are mapped to decimal.Decimal. decimal.Decimal is used for NUMERIC values as it offer a higher level of precision than float.

I will chat with the Redshift driver team to see if our Redshift JDBC driver offers such an option, and see if this is something we could support. Thank you for your patience 😃

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