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https://issues.apache.org/jira/browse/IMPALA-12509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17778576#comment-17778576
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Quanlong Huang commented on IMPALA-12509:
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Could you share how you measure the serialization time of TQueryCtx? Some
screenshots or logs might help.
> Optimize the backend startup and planner time of large Iceberg table query
> --------------------------------------------------------------------------
>
> Key: IMPALA-12509
> URL: https://issues.apache.org/jira/browse/IMPALA-12509
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Fu Lili
> Assignee: Fu Lili
> Priority: Major
>
> We found that when querying an Iceberg table with a large number of files
> (>=200000), the Query Plan and start backends took an abnormal time (>= 2s).
> The reason was that unnecessary objects were serialized when building
> TQueryCtx. The main function involved is IcebergTable::toThriftDescriptor
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