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From "William Preston (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-15042) cqlsh tracing output reports all secondary "Index mean cardinalities" are 1. SASI report as -9223372036854775808
Date Thu, 14 Mar 2019 15:03:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-15042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792756#comment-16792756
] 

William Preston commented on CASSANDRA-15042:
---------------------------------------------

[~benedict] - Please review my new comment regarding SASI cardinality reporting as -9223372036854775808
in trace. While not high priority this is quite concerning from a confidence perspective.
Thank you.

> cqlsh tracing output reports all secondary "Index mean cardinalities" are 1.  SASI report
as -9223372036854775808
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15042
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15042
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Feature/SASI, Legacy/Tools, Observability/Tracing
>            Reporter: William Preston
>            Priority: Normal
>
> Cassandra 3.11.4
>  Running a query in cqlsh with TRACING ON
> Native Secondary indexes all report cardinalities as *1*.
> trace output:
> {noformat}
> Index mean cardinalities are country_idx:1,company_idx:1,source_idx:1,domain_idx:1. Scanning
with country_idx.
> {noformat}
> Cassandra 2.2.x and its' predecessors reported cardinalities > 1 in cqlsh tracing
output: 
> {noformat}
> Candidate index mean cardinalities are
> CompositesIndexOnRegular{columnDefs=[ColumnDefinition
> {name=country, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0,
indexName=country_idx, indexType=COMPOSITES}
> ]}:2, CompositesIndexOnRegular{columnDefs=[ColumnDefinition
> {name=company, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0,
indexName=company_idx, indexType=COMPOSITES}
> ]}:1210, CompositesIndexOnRegular{columnDefs=[ColumnDefinition
> {name=source, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0,
indexName=source_idx, indexType=COMPOSITES}
> ]}:501804, CompositesIndexOnRegular{columnDefs=[ColumnDefinition
> {name=domain, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0,
indexName=domain, indexType=COMPOSITES}
> ]}:325801.
> Scanning with country_idx.{noformat}
>  
>  



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