Github user jmchung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18930#discussion_r133723113
--- Diff: sql/core/src/test/resources/sql-tests/inputs/json-functions.sql
---
@@ -20,3 +20,9 @@ select from_json('{"a":1}', 'a InvalidType');
select from_json('{"a":1}', 'a INT', named_struct('mode', 'PERMISSIVE'));
select from_json('{"a":1}', 'a INT', map('mode', 1));
select from_json();
+-- json_tuple
+SELECT json_tuple('{"a" : 1, "b" : 2}', CAST(NULL AS STRING), 'b',
CAST(NULL AS STRING), 'a');
+CREATE TEMPORARY VIEW jsonTable(jsonField, a, b) AS SELECT * FROM VALUES
('{"a": 1, "b": 2}', 'a', 'b');
+SELECT json_tuple(jsonField, b, CAST(NULL AS STRING), 'a') FROM jsonTable;
+-- Clean up
+DROP VIEW IF EXISTS jsonTable;
--- End diff --
@HyukjinKwon @viirya Fixed.
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