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Carl Yeksigian commented on CASSANDRA-6477:
-------------------------------------------
Currently, {{NULL}} is used to insert tombstones into the table:
{code:java}
// insert exactly the amount of tombstones that shouldn't trigger an
exception
for (int i = 0; i < THRESHOLD; i++)
execute("INSERT INTO %s (a, b, c) VALUES ('key', 'column" + i + "',
null);");
{code}
This means that we will have to insert a NULL value for all unset columns, as
well as all tombstone'd columns, since regular columns are not explicitly null.
In addition, we would have to insert new NULL values after a TTL expired.
> Materialized Views (was: Global Indexes)
> ----------------------------------------
>
> Key: CASSANDRA-6477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6477
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Reporter: Jonathan Ellis
> Assignee: Carl Yeksigian
> Labels: cql
> Fix For: 3.0 beta 1
>
> Attachments: test-view-data.sh, users.yaml
>
>
> Local indexes are suitable for low-cardinality data, where spreading the
> index across the cluster is a Good Thing. However, for high-cardinality
> data, local indexes require querying most nodes in the cluster even if only a
> handful of rows is returned.
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