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Empty partition keys allowed in MV, but not in normal table


Hi,

Given the following table:

cqlsh> create keyspace ks WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};
cqlsh> create table t (p text, c int, v text, primary key (p));
cqlsh> use ks;

The following fails:

cqlsh:ks> insert into t (p, c, v) values ('', 2, '');
InvalidRequest: Error from server: code=2200 [Invalid query] message="Key may not be empty"

However, MVs don't appear to have this restriction:

create materialized view mv as select * from t where v is not null and p is not null and c is not null primary key (v, p);
insert into t (p, c, v) values ('a', 2, '');
select * from mv;

 v | p | c
---+---+---
   | a | 2

I guess this is because an empty value can't be distinguished from null at the protocol level, but this distinction can be made internally.

I think the behavior should be made consistent, if nothing else because querying the MV for the empty key is impossible:

cqlsh:ks> select * from mv where v = '';
InvalidRequest: Error from server: code=2200 [Invalid query] message="Key may not be empty"

Thoughts?

Thanks,
Duarte


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