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https://issues.apache.org/jira/browse/FLINK-27845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17556611#comment-17556611
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Jingsong Lee commented on FLINK-27845:
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Hi [~complone], Before submitting a PR, it is best to discuss clearly in JIRA
what it is that needs to be done and what the general idea is.
> Introduce Column Type Schema evolution
> --------------------------------------
>
> Key: FLINK-27845
> URL: https://issues.apache.org/jira/browse/FLINK-27845
> Project: Flink
> Issue Type: Sub-task
> Components: Table Store
> Reporter: Jingsong Lee
> Priority: Minor
> Labels: pull-request-available
> Fix For: table-store-0.2.0
>
>
> After schema changes, for example, a column with int type to bigint type. We
> should convert the data from the old type to the new type.
> * What types are safe to convert? According to the implicitCastingRules in
> LogicalTypeCasts.
> * Where to convert? DataFileReader
> * How to convert? In RecordIterator.next, we can convert old RowData to new
> RowData if there is a schema change.
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