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From "William Preston (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-15042) cqlsh tracing output reports all secondary "Index mean cardinalities" are 1.
Date Mon, 04 Mar 2019 20:36:00 GMT
William Preston created CASSANDRA-15042:
-------------------------------------------

             Summary: cqlsh tracing output reports all secondary "Index mean cardinalities"
are 1. 
                 Key: CASSANDRA-15042
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15042
             Project: Cassandra
          Issue Type: Bug
          Components: Legacy/Tools
            Reporter: William Preston


Cassandra 3.11.4
Running a query in cqlsh with TRACING ON

Secondary indexes all report cardinalities as *1*.

trace output: "Index mean cardinalities are country_idx:+*1*+,company_idx:_*1*_,source_idx:+*1*+,domain_idx:+*1*+.
Scanning with country_idx."

Cassandra 2.2.x and its' predecessors reported cardinalities > 1 in cqlsh tracing output:

"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."

 



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