[GitHub] [iceberg] Reo-LEI commented on a change in pull request #3120: Core: read delete files in parallel

[GitBox <gi...@apache.org>]

Reo-LEI commented on a change in pull request #3120:
URL: https://github.com/apache/iceberg/pull/3120#discussion_r709766801



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File path: data/src/main/java/org/apache/iceberg/data/DeleteFilter.java
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@@ -135,8 +136,10 @@ protected long pos(T record) {
       Iterable<CloseableIterable<Record>> deleteRecords = Iterables.transform(deletes,
           delete -> openDeletes(delete, deleteSchema));
       StructLikeSet deleteSet = Deletes.toEqualitySet(
-          // copy the delete records because they will be held in a set
-          CloseableIterable.transform(CloseableIterable.concat(deleteRecords), Record::copy),
+          CloseableIterable.transform(
+              CloseableIterable.concat(deleteRecords, ThreadPools.getWorkerPool(), ThreadPools.getPoolParallelism()),

Review comment:
       The purpose of this PR is to be able to read deleteFile in parallel, before this PR, iceberg will read all delete files in one thread  serially. Now, delete files will be read in parallel by a worker pool.




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