wjones127 commented on code in PR #34461:
URL: https://github.com/apache/arrow/pull/34461#discussion_r1126773247
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cpp/src/parquet/arrow/reader.h:
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@@ -249,6 +249,13 @@ class PARQUET_EXPORT FileReader {
virtual ::arrow::Status ReadRowGroup(int i, std::shared_ptr<::arrow::Table>*
out) = 0;
+ virtual ::arrow::Status WillNeedRowGroups(const std::vector<int>& row_groups,
+ const std::vector<int>&
column_indices) = 0;
Review Comment:
How does the caller know when the row groups are loaded? Should this return
a `Future` instead?
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