Github user tzulitai commented on the issue: https://github.com/apache/flink/pull/4059 f228081 is for porting the topology change on restore migration tests. The rest 233c617 to e619b98 is for ports of each individual migration test with the pattern `*From12MigrationTest`. They're also refactored to deduplicate code across 1.1, 1.2, 1.3 migration tests. Note that for the CEP migration tests in 233c617, some tests for migration from 1.3 is currently ignored because they do not pass. May have bumped into a bug for the CEP library that does not allow it to restore from 1.3.x to 1.3.x ð
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