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From "Jianfeng Jia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ASTERIXDB-1131) The function-generated Null is omitted when construct a List
Date Tue, 06 Oct 2015 22:12:26 GMT
Jianfeng Jia created ASTERIXDB-1131:
---------------------------------------

             Summary: The function-generated Null is omitted when construct a List
                 Key: ASTERIXDB-1131
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1131
             Project: Apache AsterixDB
          Issue Type: Bug
          Components: Data Model
            Reporter: Jianfeng Jia


I hit a failed test case in which I was building a list with the elements generated from a
build-in function, as below,

for $a in [
starts-with("xyz",  null),
starts-with("xy", "x")
]
return $a

If any of the elements is Null, it will be omitted in the returned list, e.g. the above query
returns the following result:

[ true
 ]

However if I explicitly add a null in the list, all the Nulls will be returned.
the following query:

for $a in [
null,
starts-with("xy",  null),
starts-with("xy", "x")
]
return $a

will return the expected result:

[ null
, null
, true
 ]
It applies for other similar functions which return an option value. 




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