[ARROW-16853] pyarrow.Array affects dict keys order

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 8.0.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/32179

Language

python

• Assignee: Unassigned
• Reporter: Alexandre Cagnon
• Created: 18/Jun/22 10:18
• Updated: 11/Jan/23 11:46

Description

When applying pyarrow.array() to a list of dict, the dict keys are reordered in ascending order.

Because of this I cannot preserve the original parquet data schema when doing transformations from py to arrow.

Is the key reordering the intended behaviour ?

Is there an existing workaround ?

 

Eg.

x = [  \{'z': '', 'y': {'b': '', 'a': ''}} ]
y = pyarrow.array( x )
print( y )
print(y.to_pylist())