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feat: support reading OPTIONAL column in parquet_derive #5717

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Which issue does this PR close?

Closes #5716.

Rationale for this change

See details in the issue.

What changes are included in this PR?

Add definition level in macro code.

typed.read_records(num_records, None /*should use a Some(&mut Vec<i16>)*/, None, &mut vals)?;

Are there any user-facing changes?

No API change, extend parquet_derive to handle OPTIONAL columns.

@double-free double-free changed the title feat: support OPTIONAL column in parquet_derive feat: support reading OPTIONAL column in parquet_derive May 4, 2024
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[parquet_derive] support OPTIONAL (def_level = 1) columns by default
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