[SPARK-46540][PYTHON] Respect column names when Python data source read function outputs named Row objects#44531
Closed
allisonwang-db wants to merge 1 commit intoapache:masterfrom
Closed
Conversation
allisonwang-db
force-pushed
the
spark-46540-named-rows
branch
from
400d876 to
4b44669
Compare
Contributor
Author
HyukjinKwon
reviewed
Jan 2, 2024
| pylist[col].append(column_converters[col](result[col])) | ||
| # Assign output values by name of the field, not position, if the result is a | ||
| # named `Row` object. | ||
| if isinstance(result, Row) and hasattr(result, "__fields__"): |
Member
There was a problem hiding this comment.
Can we match the implementation with python worker? See assign_cols_by_name at worker.py.
Contributor
Author
There was a problem hiding this comment.
This is actually different from assign_cols_by_name which re-arranges arrow batch columns by the arrow type names. Here we want to match a single named Row object to the return schema. The only way to tell whether it's named Row(a=1, b=1) from an unnamed Row(1,2) is by checking this __fields__.
HyukjinKwon
approved these changes
Jan 2, 2024
Member
|
Merged to master. |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
What changes were proposed in this pull request?
This PR fixes an issue when the
readmethod of Python DataSourceReader yields namedRowobjects.Currently, it ignores the name in the Row object:
The result should be
[Row(a=1, b=2), Row(a=2, b=3)], instead of[Row(a=1 , b=2), Row(a=3, b=2)].Why are the changes needed?
To fix an incorrect behavior.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Unit test
Was this patch authored or co-authored using generative AI tooling?
No