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Fix constant value from stats#20042

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adriangb merged 2 commits intomainfrom
fix-constant-datatype-parquet
Jan 28, 2026
Merged

Fix constant value from stats#20042
adriangb merged 2 commits intomainfrom
fix-constant-datatype-parquet

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@gabotechs
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@gabotechs gabotechs commented Jan 28, 2026

Which issue does this PR close?

Rationale for this change

Fix a bug that appeared when reading constant values from stats

What changes are included in this PR?

  • A 2-line bug fix
  • A test that reproduces the issue on main and succeeds in this PR

Are these changes tested?

Yes, by a new unit test.

Additionally, I tested this changes with https://github.com/datafusion-contrib/datafusion-distributed and the problem is solved also there.

Are there any user-facing changes?

Nothing besides the bug fix

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@kosiew kosiew left a comment

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LGTM

Left a minor suggestion.

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cc @Weijun-H @adriangb as I think this was introduced in #19136

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thanks @kosiew! I'll leave this open until tomorrow so that other people can comment.

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Nice, good fix! I think this is a straightforward bug fix, we can go ahead and merge it.

@adriangb adriangb added this pull request to the merge queue Jan 28, 2026
Merged via the queue into main with commit 4b31aaa Jan 28, 2026
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alamb pushed a commit to alamb/datafusion that referenced this pull request Mar 4, 2026
## Which issue does this PR close?

<!--
We generally require a GitHub issue to be filed for all bug fixes and
enhancements and this helps us generate change logs for our releases.
You can link an issue to this PR using the GitHub syntax. For example
`Closes apache#123` indicates that this PR will close issue apache#123.
-->

- Closes apache#20041

## Rationale for this change

<!--
Why are you proposing this change? If this is already explained clearly
in the issue then this section is not needed.
Explaining clearly why changes are proposed helps reviewers understand
your changes and offer better suggestions for fixes.
-->

Fix a bug that appeared when reading constant values from stats

## What changes are included in this PR?

<!--
There is no need to duplicate the description in the issue here but it
is sometimes worth providing a summary of the individual changes in this
PR.
-->
- A 2-line bug fix
- A test that reproduces the issue on `main` and succeeds in this PR

## Are these changes tested?

<!--
We typically require tests for all PRs in order to:
1. Prevent the code from being accidentally broken by subsequent changes
2. Serve as another way to document the expected behavior of the code

If tests are not included in your PR, please explain why (for example,
are they covered by existing tests)?
-->

Yes, by a new unit test.

Additionally, I tested this changes with
https://github.com/datafusion-contrib/datafusion-distributed and the
problem is solved also there.

## Are there any user-facing changes?

Nothing besides the bug fix

<!--
If there are user-facing changes then we may require documentation to be
updated before approving the PR.
-->

<!--
If there are any breaking changes to public APIs, please add the `api
change` label.
-->
alamb added a commit that referenced this pull request Mar 4, 2026
- Part of #20681
- Closes #20041 on branch-52

This PR:
- Backports #20042 from
@gabotechs to the `branch-52` line

Co-authored-by: Gabriel <45515538+gabotechs@users.noreply.github.com>
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"expected Dictionary(UInt16, Utf8) but found Utf8" while reading parquet files.

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