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https://issues.apache.org/jira/browse/FLINK-36318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Nuyanzin resolved FLINK-36318.
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Fix Version/s: 2.0-preview
Resolution: Fixed
> Fail to restore from 1.18 if LAG function is used
> -------------------------------------------------
>
> Key: FLINK-36318
> URL: https://issues.apache.org/jira/browse/FLINK-36318
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.19.0, 1.20.0, 1.19.1
> Reporter: Dawid Wysakowicz
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.2, 1.20.1, 2.0-preview
>
>
> One can not restore from a savepoint taken in 1.18 using Flink 1.19 if a
> query uses e.g. {{LAG}} function on a {{MAP}} type.
> The reason is {{LAG/LEAD/ARRAY_AGG}} and possibly other functions use {{RAW}}
> type for accumulator.
> In
> https://github.com/apache/flink/blob/d4c9ef165874e665b9e0f70cfe80fc3d387ac58e/flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/typeutils/RowDataSerializer.java#L318
> we deserialize/serialize types using java serialization which results in
> serializers being written into the snapshot.
> In 1.19
> https://github.com/apache/flink/blob/d4c9ef165874e665b9e0f70cfe80fc3d387ac58e/flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/typeutils/MapDataSerializer.java#L54
> was modified resulting in a change in {{serialVersionUID}}
> As a result we fail to restore savepoints with a serialVersionUID mismatch.
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