Benjamin Lerer updated CASSANDRA-9228:
         Assignee:     (was: Benjamin Lerer)
    Fix Version/s:     (was: 3.x)

> 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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