Vladimir Ozerov created IGNITE-5422:
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Summary: CREATE TABLE command should support all-key fields case
Key: IGNITE-5422
URL: https://issues.apache.org/jira/browse/IGNITE-5422
Project: Ignite
Issue Type: Task
Components: sql
Reporter: Vladimir Ozerov
Assignee: Alexander Paschenko
Fix For: 2.2
Currently it is impossible to create a table containing only {{PRIMARY KEY}}
columns:
{code}
CREATE TABLE PersonProject {
person_id BIGINT,
project_id BIGINT,
PRIMARY KEY (person_id, project_id);
};
{code}
The reason for this limitation is that we have nothing to be saved as cache
value and {{null}} values are restricted because they are indistinguishable
from removal.
We should allow this case somehow. Possible solutions:
1) Save empty object of table type:
{{IgniteBinary.builder("PersonProject").build()}}
2) Save {{false}} as it is done in Java in Map-to-Set conversion
Note that DML processing should be adjusted accordingly.
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