Support materialized views [DATACASS-383]

[spring-projects-issues]

Mark Paluch opened DATACASS-383 and commented

See http://www.datastax.com/dev/blog/new-in-cassandra-3-0-materialized-views

---

5 votes, 9 watchers

[spring-projects-issues]

Andrew commented

To speed up the process, just wanted to suggest an example of what we implemented in our project.

Define additional views on table entities:

@Table("user")
@MaterializedViews({
  @MaterializedView(name="user_by_email", primaryKeyColumns = {
        @PrimaryKeyColumn(value = "email", type = PrimaryKeyType.PARTITIONED),
        @PrimaryKeyColumn(value = "id")
    })
})

Use a query:

@Table("user")
@MaterializedViews({
  @MaterializedView(name="user_by_email",
      query="SELECT * FROM user WHERE email IS NOT NULL AND id IS NOT NULL",
      primaryKeyColumns = {
        @PrimaryKeyColumn(value = "email", type = PrimaryKeyType.PARTITIONED),
        @PrimaryKeyColumn(value = "id")
    })
})

Plus added schema specs and generation/drop extending
CassandraPersistentEntitySchemaCreator and CassandraSessionFactoryBean. Works fine so far.

[spring-projects-issues]

Kamil commented

Guys, are there any plans to support it?

[spring-projects-issues]

Mark Paluch commented

It makes sense to start out with CQL generation and view descriptors in the first place. I'm not entirely sold on annotation-based schema creation. The query part allows more than just NOT NULL predicates. Stating queries that way is error-prone and functionality can be only verified when using schema creation.

Using views requires our CassandraTemplate methods to also accept a table name

[spring-projects-issues]

Nate McCall commented

We have retro-actively marked Materialized Views as experimental. In order to keep users from hitting any of the (numerous) issues, I am asking that you avoid creating any implementations here until we can iron out the functionality.
http://mail-archives.apache.org/mod_mbox/cassandra-user/201710.mbox/%[email protected]%3E

[spring-projects-issues]

Mark Paluch commented

Thanks for the heads up