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GH-452: Clarify use of RowGroup.ordinal field (#453)
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* clarify rg ordinal in readers

* nit: sentence structure
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ggershinsky authored Sep 25, 2024
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Expand Up @@ -356,6 +356,11 @@ struct RowGroup {
}
```

The integrity of this field is protected by authenticated encryption of the footer (FileMetaData). Therefore,
the reader implementations can use either a local row group counter (ordinal) or the `RowGroup.ordinal`
field as an input to AAD suffix calculation. The latter option can be helpful when different reader
threads process different row groups in the same parquet file.

A `crypto_metadata` field is set in each ColumnChunk in the encrypted columns. ColumnCryptoMetaData
is a union - the actual structure is chosen depending on whether the column is encrypted with the
footer encryption key, or with a column-specific key. For the latter, a key metadata can be specified.
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