apache / apache/hudi

Fix nested column projection in hudi connector

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#16,734 1 comment 0 reactions 1 assignee Claimed by @nsivabalan View on GitHub
from-jira priority:high type:devtask
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Description

Quoting from [Slack thread -|https://trinodb.slack.com/archives/CGB0QHWSW/p1731697476660179]
{code:java}
Hudi connector is not great at reading values from the deeply nested objects. Historically we've got a table where one field has around 5000 nested fields, so the user that only tries to read a few fields quickly runs out of RAM because apparently the whole object is being read into memory. {code}
Hudi connector needs to implement `HiveMetadata#applyProjection` to support projection for nested fields.

## JIRA info

- Link: https://issues.apache.org/jira/browse/HUDI-8540
- Type: Task
- Epic: https://issues.apache.org/jira/browse/HUDI-2687
- Fix version(s):
- 1.1.0

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