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[substrait] [sqllogictest] Schema contains duplicate qualified field name #16295

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@gabotechs

Description

@gabotechs

Describe the bug

~8 sqllogictest cases are failing in Substrait round-trip mode because of the following error:

query failed: DataFusion error: Schema error: Schema contains duplicate qualified field name alltypes_plain.int_col

To Reproduce

cargo test --test sqllogictests -- --substrait-round-trip intersection.slt:33

Expected behavior

The sqllogictest passes in Substrait round-trip mode

Additional context

This is part of a broader initiative to improve the reliability of Substrait-to-DataFusion logical plan conversions.

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