Dmitry Lychagin created ASTERIXDB-2449:
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Summary: Incorrect null/missing handling in string/binary concat
functions and concat operator
Key: ASTERIXDB-2449
URL: https://issues.apache.org/jira/browse/ASTERIXDB-2449
Project: Apache AsterixDB
Issue Type: Bug
Components: FUN - Functions
Reporter: Dmitry Lychagin
Assignee: Dmitry Lychagin
There a couple of issue with null/missing handling in string_concat() and
binary_concat().
1) The return type should always be inferred as unknownable string. Currently
the return type is inferred as string if input cannot be null/missing. This is
incorrect because these functions return null/missing not only if the input
argument is null/missing, but also if an item in the input list is null/missing
2) These functions should return 'missing' in input list is [ null, missing ].
Currently they both return 'null' in this case
String concatenation operator (||) is also affected by these issues because
it's rewritten into string_concat()
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