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From Michaël Figuière (JIRA) <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9228) Add documentation for Type Cast, Type Conversion and Function Overloading
Date Thu, 23 Apr 2015 15:34:38 GMT
Michaël Figuière created CASSANDRA-9228:
-------------------------------------------

             Summary: Add documentation for Type Cast, Type Conversion and Function Overloading
                 Key: CASSANDRA-9228
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9228
             Project: Cassandra
          Issue Type: Task
            Reporter: Michaël Figuière
            Priority: Minor


While digging around UDF overloading and type conversion it appeared that several topics aren't
currently documented in the CQL spec:
* Explicit type casting has been added with CASSANDRA-5226 in Cassandra 1.2.2 and is currently
not explained in the spec.
* UDFs support overloading, this should be explained in the CQL spec, along with a clear definition
of what is considered as an ambiguous function call.
* In this context it also becomes important to document the type conversion rules, that is,
which type A can be converted to which type B without raising an error.
* Not directly related but it would also be useful to document the column type changes that
are allowed in {{ALTER TABLE}} statements.

All these fairly important topics are currently not obvious or hard to figure out for the
user.



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