pitrou commented on code in PR #242:
URL: https://github.com/apache/parquet-format/pull/242#discussion_r1610118153
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src/main/thrift/parquet.thrift:
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@@ -1165,6 +1317,62 @@ struct FileMetaData {
9: optional binary footer_signing_key_metadata
}
+/** Metadata for a column in this file. */
+struct FileColumnMetadataV3 {
+ /** All column chunks in this file (one per row group) **/
+ 1: required list<ColumnChunkV3> columns
Review Comment:
> I think that if instead of:
> `required list<ColumnChunkV3> columns`
> we had another indirection
> `required list<i64> column_chunk_offsets // n+1 offsets to ColumnChunkV3`
> it would solve the problem of random row group access.
It could also be a `required list<binary> encoded_chunks // Thrift-encoded
ColumnChunkV3 objects`. That way, you don't have to issue one additional IO for
each column chunk.
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