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https://issues.apache.org/jira/browse/CASSANDRA-11310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208743#comment-15208743
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Alex Petrov commented on CASSANDRA-11310:
-----------------------------------------
I hope this time it should be a bit better.
Unfortunately, making a {{useFiltering}} boolean variable similar to
{{usesSecondaryIndexing}} would mean splitting some logic within
{{StatementRestrictions::needFiltering}} into several places and adding several
iterations (for example check for whether clustering columns cause indexing and
whether adding the contains restriction would cause filtering).
Although other than that - there was one redundant check (for
{{usesSecondaryIndexing || clusteringColumnRestrictions}} that already happens
in {{processClusteringColumnRestrictions}}). Clustering column restrictions are
added without influencing indexing flag now, as {{needFiltering}} is now on
{{ClusteringColumnRestrictions}}.
I've added test covering {{ORDER}}, {{COMPACT}}, {{static}} columns, overall
in/across partitions, with different combinations of slices, with frozen
collections in PK.
New branch is here: https://github.com/ifesdjeen/cassandra/commits/11310-trunk
Thank you.
> Allow filtering on clustering columns for queries without secondary indexes
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-11310
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11310
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL
> Reporter: Benjamin Lerer
> Assignee: Alex Petrov
> Labels: doc-impacting
> Fix For: 3.x
>
>
> Since CASSANDRA-6377 queries without index filtering non-primary key columns
> are fully supported.
> It makes sense to also support filtering on clustering-columns.
> {code}
> CREATE TABLE emp_table2 (
> empID int,
> firstname text,
> lastname text,
> b_mon text,
> b_day text,
> b_yr text,
> PRIMARY KEY (empID, b_yr, b_mon, b_day));
> SELECT b_mon,b_day,b_yr,firstname,lastname FROM emp_table2
> WHERE b_mon='oct' ALLOW FILTERING;
> {code}
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