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From "ZhaoYang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13991) NullPointerException when querying a table with a previous state
Date Sun, 05 Nov 2017 15:57:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16239598#comment-16239598
] 

ZhaoYang commented on CASSANDRA-13991:
--------------------------------------

[~mildebrandt] Thanks for the report.

I think it's gocql driver issue of re-writing the output buffer of {{iter.PageState()}} (
This [value|https://github.com/gocql/gocql/blob/aa93acc8f067e9233982b9a7de370e4d64b9c33e/session.go#L1303]
is probably reused internally in gocql). 
I am not familiar with golang spec, but you can try clone the output of {{iter.PageState()}}
.
{code}
	cloned_paging := make([]byte, len(next))
	copy(cloned_paging, next)
{code}
Do you mind create an issue on gocql github?

At the same time, in Cassandra, we could improve the error handling with null PK for range
pager.

> NullPointerException when querying a table with a previous state
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-13991
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13991
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>            Reporter: Chris mildebrandt
>         Attachments: CASSANDRA-13991.log
>
>
> Performing the following steps (using the gocql library) results in an NPE:
> * With a table of 12 entries, read all rows.
> * Set the page size to 1 and read the first row. Save the query state.
> * Read all the row again.
> * Set the page size to 5 and the page state to the previous state. (This is where the
NPE occurs).
> This can be reproduced with the following project:
> https://github.com/eyeofthefrog/CASSANDRA-13991



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