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https://issues.apache.org/jira/browse/HUDI-2023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17363761#comment-17363761
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sivabalan narayanan commented on HUDI-2023:
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I tested both COW and MOR for simple schema evolution of adding a new column.
Here are my findings.
// "succeeds" refers to write succeeded and a read following the write
succeeded to read entire dataset.
|| ||COW||MOR||
|Adding a new nullable column at root level at the end|succeeds|succeeds|
|Adding a new nullable column to inner struct (at the end)|succeeds|succeeds|
|Adding a new non-nullable column at root level at the end|fails|write
succeeds, but read fails as expected|
|Adding a new non-nullable column to inner struct (at the end)|fails|write
succeeds, but read fails as expected|
Validated so far w/ spark datasource. Will update once I have results w/ delta
streamer.
> Validate Schema evolution in hudi
> ---------------------------------
>
> Key: HUDI-2023
> URL: https://issues.apache.org/jira/browse/HUDI-2023
> Project: Apache Hudi
> Issue Type: Test
> Components: Testing
> Reporter: sivabalan narayanan
> Assignee: sivabalan narayanan
> Priority: Major
>
> Test schema evolution in hudi and document the same
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