Alan Conway created PROTON-1940:
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Summary: [c] normalize encoding of multiple="true" fields
Key: PROTON-1940
URL: https://issues.apache.org/jira/browse/PROTON-1940
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.25.0
Reporter: Alan Conway
Assignee: Alan Conway
Fix For: proton-c-0.26.0
The AMQP spec defines some frame fields as "multiple".
[http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-types-v1.0-os.html#section-composite-type-representation]
"The _multiple_ attribute of a field description controls whether multiple
element values are permitted in the representation. A single element of the
type specified in the field description is always permitted. Multiple values
are represented by the use of an array where the type of the elements in the
array is the type defined in the field definition. Note that a null value and a
zero-length array (with a correct type for its elements) both describe an
absence of a value and MUST be treated as semantically identical. "
Proton accepts all legal values. This issue is to normalize values written by
proton:
* empty array becomes null
* array of one element becomes a single value
This is the most efficient encoding, and some clients (.NET) have problems with
multiple fields that contain an empty array rather than a null.
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