[GitHub] [arrow] jorisvandenbossche commented on a change in pull request #7526: ARROW-9146: [C++][Dataset] Lazily store fragment physical schema

jorisvandenbossche commented on a change in pull request #7526: URL: https://github.com/apache/arrow/pull/7526#discussion_r445516148 ## File path: cpp/src/arrow/util/mutex.h ## @@ -0,0 +1,58 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contribut

[GitHub] [arrow] jorisvandenbossche commented on a change in pull request #7526: ARROW-9146: [C++][Dataset] Lazily store fragment physical schema

jorisvandenbossche commented on a change in pull request #7526: URL: https://github.com/apache/arrow/pull/7526#discussion_r445482607 ## File path: cpp/src/arrow/util/mutex.h ## @@ -0,0 +1,58 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contribut

[GitHub] [arrow] jorisvandenbossche commented on a change in pull request #7526: ARROW-9146: [C++][Dataset] Lazily store fragment physical schema

jorisvandenbossche commented on a change in pull request #7526: URL: https://github.com/apache/arrow/pull/7526#discussion_r86902 ## File path: cpp/src/arrow/dataset/file_parquet.cc ## @@ -357,13 +355,20 @@ static inline Result> AugmentRowGroups( return row_groups; }