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https://issues.apache.org/jira/browse/CALCITE-3073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16848444#comment-16848444
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Matt Wang commented on CALCITE-3073:
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[~mingmxu] I think is is not necessary to support to read from special offset 
in KafkaAdapter for the topic could have many partitions(set offset for every 
partition is a tedious job). The timestamp can cover most user needs.

> support both from/to timestamp/offset in KafkaAdapter
> -----------------------------------------------------
>
>                 Key: CALCITE-3073
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3073
>             Project: Calcite
>          Issue Type: Improvement
>          Components: kafka-adapter
>            Reporter: Xu Mingmin
>            Assignee: Matt Wang
>            Priority: Major
>
> Currently the KafkaAdapter consumes data from default 
> offset(latest/earliest/last_offset) and runs forever. With support of from/to 
> timestamp/offset, it's more flexible for users to query a specific range.



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