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https://issues.apache.org/jira/browse/CASSANDRA-11031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436560#comment-15436560
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Alex Petrov commented on CASSANDRA-11031:
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Thank you for the review! I've addressed your comments and wait for the test
results now. All changes are done in a separate commit to make it simpler to
see what's been done, I'll combine them if you +1.
bq. The hasSlice method is now duplicated in PartitionKeySingleRestrictionSet
and ClusteringColumnRestrictions. It would be better to put it only into
RestrictionSet and expose it into Restrictions.
Removed the redundant method, pulled it up.
bw. We should have some unit test for MaterializedViews with Slice and
unrestricted partition keys.
Added the MV tests, similar to the previously existing ones.
bq. In StatementRestrictions::processPartitionKeyRestrictions I do not think
that the error message: "Partition key parts: %s must be restricted as other
parts are" makes sense any more (for non-MVs). We should probably only use the
ALLOW FILTERING error message.
Now we just have one error message, same everywhere. Tests adjusted accordingly.
bq. The part of StatementRestrictions::processPartitionKeyRestrictions dealing
with secondary index can probably be combined with the one dealing with the
filtering.
True, I've separated them for sakes of simplicity, but I hope that new version
looks clean as well. Combining them furhter is tricky and will require
double-checking of non-restricted PK parts and whether or not restrictions are
empty. It was a bit simpler previously since we did't have to take care of
slices.
bq. In RowFilter we should not use Lambda expression to filter out the rows as
they are pretty bad from the performance point of view and result in a lot of
garbage. In RowFilter: Iterables.size(rowLevelExpressions) can be replaced by
rowLevelExpressions.size()
Optimised that part as well, got rid of streams alltogether, we iterate through
restrictions just once now.
bq. The tests using secondary indices should be put into SecondaryIndexTest
Moved the tests.
bq. It will be good to add more tests into
SelectOrderedPartitionerTest::testFilteringOnPartitionKeyWithToken: with > on
one of the partition key or only the second partition key being specified
I've added one more clause that seemed missing, although since token
restrictions require both parts for the token function, I did not add anything
else.
bq. In SelectTest::testAllowFilteringOnPartitionKey the message IN restrictions
are not supported on indexed columns looks wrong to me as the test do not use
any secondary index.
For clarity here, I've added a more elaborate message that specifies that
filtering is involved.
|[trunk|https://github.com/ifesdjeen/cassandra/tree/11031-trunk]|[dtest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-11031-trunk-dtest/]|[testall|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-11031-trunk-testall/]|
> MultiTenant : support “ALLOW FILTERING" for Partition Key
> ---------------------------------------------------------
>
> Key: CASSANDRA-11031
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11031
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL
> Reporter: ZhaoYang
> Assignee: ZhaoYang
> Priority: Minor
> Fix For: 3.x
>
>
> Currently, Allow Filtering only works for secondary Index column or
> clustering columns. And it's slow, because Cassandra will read all data from
> SSTABLE from hard-disk to memory to filter.
> But we can support allow filtering on Partition Key, as far as I know,
> Partition Key is in memory, so we can easily filter them, and then read
> required data from SSTable.
> This will similar to "Select * from table" which scan through entire cluster.
> CREATE TABLE multi_tenant_table (
> tenant_id text,
> pk2 text,
> c1 text,
> c2 text,
> v1 text,
> v2 text,
> PRIMARY KEY ((tenant_id,pk2),c1,c2)
> ) ;
> Select * from multi_tenant_table where tenant_id = "datastax" allow filtering;
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