tustvold commented on code in PR #7479:
URL: https://github.com/apache/arrow-rs/pull/7479#discussion_r2077891556
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parquet/src/arrow/arrow_reader/mod.rs:
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@@ -314,14 +314,19 @@ impl ArrowReaderOptions {
}
}
- /// Provide a schema to use when reading the parquet file. If provided it
- /// takes precedence over the schema inferred from the file or the schema
defined
- /// in the file's metadata. If the schema is not compatible with the file's
- /// schema an error will be returned when constructing the builder.
+ /// Provide a schema to use when reading the Parquet file.
///
- /// This option is only required if you want to cast columns to a
different type.
- /// For example, if you wanted to cast from an Int64 in the Parquet file
to a Timestamp
- /// in the Arrow schema.
+ /// If provided, this schema takes precedence over the schema inferred from
Review Comment:
This is not true, the schema in the parquet file must be authoritative. The
arrow schema is merely a hint - see #1663
Edit: it may take precedence over the embedded arrow schema though, I don't
recognise this particular codepath
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