Dandandan commented on code in PR #21190:
URL: https://github.com/apache/datafusion/pull/21190#discussion_r3003344763
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datafusion/datasource-parquet/src/opener.rs:
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@@ -125,15 +133,338 @@ pub(super) struct ParquetOpener {
pub reverse_row_groups: bool,
}
+/// States for [`ParquetOpenFuture`]
+///
+/// These states correspond to the steps required to read and apply various
+/// filter operations.
+///
+/// States whose names beginning with `Load` represent waiting on IO to resolve
+///
+/// ```text
+/// Start
+/// |
+/// v
+/// [LoadEncryption]?
+/// |
+/// v
+/// PruneFile
+/// |
+/// v
+/// LoadMetadata
+/// |
+/// v
+/// PrepareFilters
Review Comment:
Perhaps it would need some change to e.g. `PageIndexIO` and `PageIndexRead`
for that to work.
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