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Which issue does this PR close?

Rationale for this change

What changes are included in this PR?

Removes the second recursive traversal inside LogicalPlan::Join, it was causing duplicate filters to pop up when gathering filters. Not sure what the reasoning for this second right side traversal was in the first place.

Are these changes tested?

Are there any user-facing changes?

@github-actions github-actions bot added the sql SQL Planner label Sep 2, 2025
@github-actions github-actions bot added the core Core DataFusion crate label Sep 2, 2025
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@nuno-faria nuno-faria left a comment

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LGTM

Comment on lines -699 to -705
self.select_to_sql_recursively(
right_plan.as_ref(),
query,
select,
&mut right_relation,
)?;

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Maybe someone more knowledgeable could provide some context to this repeated call, but since all tests still work there doesn't seem to be a problem.

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I agree -- it seems like a copy/paste bug to me.

My git archeology suggests it came in the initial PR from @backkem

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@alamb alamb left a comment

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Thank you @jonathanc-n and @nuno-faria for the review

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Unparsing of CROSS JOINs with filters is generating incorrect queries
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