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GH-452: Clarify use of RowGroup.ordinal field #453

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Sep 25, 2024
Merged

GH-452: Clarify use of RowGroup.ordinal field #453

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66e56fc
clarify rg ordinal in readers
ggershinsky Sep 23, 2024
3690b03
nit: sentence structure
ggershinsky Sep 24, 2024
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5 changes: 5 additions & 0 deletions Encryption.md
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Expand Up @@ -356,6 +356,11 @@ struct RowGroup {
}
```

The integrity of this field is protected by footer (FileMetaData) authenticated encryption. 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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