DarkWanderer commented on code in PR #10420:
URL: https://github.com/apache/arrow-rs/pull/10420#discussion_r4049634060
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parquet/src/arrow/async_reader/mod.rs:
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@@ -675,6 +675,35 @@ impl<T: AsyncFileReader + Send + 'static>
ParquetRecordBatchStreamBuilder<T> {
self
}
+ /// Read and decode the dictionary page for a column in a row group, if
any.
+ ///
+ /// Returns `Ok(None)` if the column chunk has no dictionary page, or if
+ /// its physical type is not `BYTE_ARRAY` (the only physical type
+ /// currently supported).
+ ///
+ /// This can be used to inspect dictionary values when selecting or pruning
+ /// row groups before passing the selected indices to
+ /// [`ParquetRecordBatchStreamBuilder::with_row_groups`].
+ ///
+ /// Note this does not verify that the *entire* column chunk is
+ /// dictionary-encoded -- callers that need that guarantee (e.g. to treat
+ /// the dictionary as an exhaustive set of the column's values) should
+ /// check
+ ///
[`crate::file::metadata::ColumnChunkMetaData::page_encoding_stats_mask`].
+ pub async fn get_row_group_column_dictionary(
Review Comment:
Done
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