rdblue commented on code in PR #10962:
URL: https://github.com/apache/iceberg/pull/10962#discussion_r1859255414
##########
core/src/test/java/org/apache/iceberg/TestRewriteFiles.java:
##########
@@ -384,6 +386,116 @@ public void testRewriteDataAndAssignOldSequenceNumber() {
assertThat(listManifestFiles()).hasSize(4);
}
+ @TestTemplate
+ public void
testRewriteDataAndAssignOldSequenceNumbersShouldNotDropDeleteFiles() {
+ assumeThat(formatVersion)
+ .as("Sequence number is only supported in iceberg format v2 or later")
+ .isGreaterThan(1);
+ assertThat(listManifestFiles()).isEmpty();
+
+ commit(table,
table.newRowDelta().addRows(FILE_A).addDeletes(FILE_A2_DELETES), branch);
+
+ long firstRewriteSequenceNumber = latestSnapshot(table,
branch).sequenceNumber();
+
+ commit(
+ table,
+
table.newRowDelta().addRows(FILE_B).addRows(FILE_B).addDeletes(FILE_B2_DELETES),
+ branch);
+ commit(
+ table,
+
table.newRowDelta().addRows(FILE_B).addRows(FILE_C).addDeletes(FILE_C2_DELETES),
+ branch);
+
+ long secondRewriteSequenceNumber = latestSnapshot(table,
branch).sequenceNumber();
+
+ commit(
+ table,
+ table
+ .newRewrite()
+ .addFile(FILE_D)
+ .deleteFile(FILE_B)
+ .deleteFile(FILE_C)
+ .dataSequenceNumber(secondRewriteSequenceNumber),
+ branch);
+
+ TableMetadata base = readMetadata();
+ Snapshot baseSnap = latestSnapshot(base, branch);
+ long baseSnapshotId = baseSnap.snapshotId();
+
+ Comparator<ManifestFile> sequenceNumberOrdering =
+ new Comparator<>() {
+ @Override
+ public int compare(ManifestFile o1, ManifestFile o2) {
+ return (int) (o1.sequenceNumber() - o2.sequenceNumber());
+ }
+ };
+
+ // FILE_B2_DELETES and FILE_A2_DELETES should not be removed as the
rewrite specifies
+ // `firstRewriteSequenceNumber`
+ // explicitly which is the same as that of A2_DELETES and before B2_DELETES
+
+ // Technically A1_DELETES could be removed since it's an equality delete
and should apply on
+ // data sequences strictly
+ // smaller, so it's no longer needed. However, MergingSnapshotProducer
calls
+ // dropDeleteFilesOlderThan
+ // which doesn't consider if the file is an equality delete, if that API
is changed the equality
+ // delete file could be dropped sooner
Review Comment:
Looks like this comment is not correctly formatted. Can you fix it please?
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