This changes announce_migration() to return a change event directory in
schema_altering_statement base class. It's needed for drop index
statement, which does not know the keyspace or column family until it
looks up them based on the index. Two stage approach of announcing a
migration and then creating the change event won't work because in the
latter stage, the lookup will fail. The same change in
announce_migration() has been applied to Apache Cassandra.
In preparation for splitting raw and prepared variants of subclasses
of schema_altering_statement, remove schema_altering_statment::prepare().
All subclasses already implement it themselves (by creating a new instance).
Pass a reference to storage_proxy and apply mutations in
legacy_schema_tables::merge_schema().
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Migration manager announce functions now return a future. Switch to the
new API in modification statements.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
There's a cyclic dependency between cql3 and transport namespaces when
we introduce prepared statements. The latter pulls
parsed_statement::prepared from the former. Break the cycle by using
a forward delcaration in cql_statement.hh.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
