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https://issues.apache.org/jira/browse/CASSANDRA-13379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943099#comment-15943099
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Alex Petrov commented on CASSANDRA-13379:
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bq. By the way, it does not explain select count(*)
It does use paging internally, yes.
bq. Yep, it's paging
Thank you for confirming it. I'll close this one as a duplicate then and will
try to fix the paging issue as soon as possible.
> SASI index returns duplicate rows
> ---------------------------------
>
> Key: CASSANDRA-13379
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13379
> Project: Cassandra
> Issue Type: Bug
> Components: sasi
> Reporter: Igor Novgorodov
>
> {code}
> CREATE TABLE bulks_recipients (
> bulk_id uuid,
> recipient text,
> bulk_id_idx uuid,
> PRIMARY KEY ((bulk_id, recipient))
> )
> {code}
> *bulk_id_idx* is just a copy of *bulk_id* because SASI does not work on
> partition key component at all for some reason.
> {code}
> CREATE CUSTOM INDEX bulks_recipients_bulk_id ON bulks_recipients
> (bulk_id_idx) USING 'org.apache.cassandra.index.sasi.SASIIndex';
> {code}
> Then i insert 1 million rows with the same *bulk_id* and different
> *recipient*. Then
> {code}
> > select count(*) from bulks_recipients ;
> count
> ---------
> 1000000
> (1 rows)
> {code}
> Ok, it's fine here. Now let's query by SASI:
> {code}
> > select count(*) from bulks_recipients where bulk_id_idx =
> > fedd95ec-2cc8-4040-8619-baf69647700b;
> count
> ---------
> 1010101
> (1 rows)
> {code}
> Hmm, very strange count - 10101 extra rows.
> Ok, i've dumped the query result into a text file:
> {code}
> # cat sasi.txt | wc -l
> 1000200
> {code}
> Here we have 200 extra rows for some reason.
> Let's check if these are duplicates:
> {code}
> # cat sasi.txt | sort | uniq | wc -l
> 1000000
> {code}
> Yep, looks like.
> Recreating index does not help. If i issue the very same query (against
> partition key *bulk_id*, not *bulk_id_idx*) - i get correct results.
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