Michaël Figuière created CASSANDRA-9228:
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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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