Hi Riyafa,
the description is a spec is indeed a little terse :)
Examples are:
accumulate(({ "a": "b" }, { "c": "d" })) returns { "a": "b", "c": "d" }
accumulate(({ "a": "b" }, { "a": "d" })) returns { "a": [ "b", "d" ] }
In the second example there is a collision for the key "a" and instead
of
raising an error, the function will create an array that contain all the
values for the key "a" in the source objects and use that as the value
for "a" in the result object.
Does this make sense?
Cheers,
Till
On 27 Jul 2016, at 4:46, Riyafa Abdul Hameed wrote:
Hi,
I have attempted to implement libjn:accumulate[1]. This implementation
is
based on the part of the specification[2] which states that the
function be
implemented as follows:
declare function libjn:accumulate($sequence as item()*) as object()
{
{|
for $key in $sequence() return { $key : $sequence($key) }
|}
};
Since this method uses the dynamic constructor for objects this will
throw
an error upon pair collision.
But the specification also says :
"This function dynamically builds an object, like jn:object, except
that it
does not throw an error upon pair collision. Instead, it accumulates
them
into an array."
I am not sure I understand this because this conflicts with the
previous
(declare function) method specified and my implementation is based on
the
declare function method. What is the use of accumulating them into an
array? Further no examples are provided on this.
[1] https://github.com/apache/vxquery/pull/126
[2]
http://jsoniq.org/docs/JSONiqExtensionToXQuery/html-single/index.html#idm139680684849856
Thank you.
Yours sincerely,
Riyafa
--
Riyafa Abdul Hameed
Undergraduate, University of Moratuwa
Email: [email protected]
Website: https://riyafa.wordpress.com/ <http://riyafa.wordpress.com/>
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