[ASTERIXDB-1131] The function-generated Null is omitted when construct a List

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: TYPE - Data Model
• Assignee: Yingyi Bu
• Reporter: Jianfeng Jia
• Created: 06/Oct/15 22:11
• Updated: 04/Jun/16 06:49
• Resolved: 04/Jun/16 06:49

Description

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.