maropu commented on a change in pull request #27759: [SPARK-31008][SQL]Support
json_array_length function
URL: https://github.com/apache/spark/pull/27759#discussion_r388010199
##########
File path: sql/core/src/test/resources/sql-tests/inputs/json-functions.sql
##########
@@ -58,5 +58,16 @@ select schema_of_json('{"c1":01, "c2":0.1}',
map('allowNumericLeadingZeros', 'tr
select schema_of_json(null);
CREATE TEMPORARY VIEW jsonTable(jsonField, a) AS SELECT * FROM VALUES ('{"a":
1, "b": 2}', 'a');
SELECT schema_of_json(jsonField) FROM jsonTable;
+
+-- json_array_length
+select json_array_length('');
+select json_array_length('[]');
+select json_array_length('[1,2,3]');
+select json_array_length('[[1,2],[5,6,7]]');
+select json_array_length('[{"a":123},{"b":"hello"}]');
+select json_array_length('[1,2,3,[33,44],{"key":[2,3,4]}]');
+select json_array_length('{"key":"not a json array"}');
Review comment:
Does this function need to be array-specific? Yea, I know this is the same
behaviour with pgSQL. But, `json_length` in mysql is more general one?
```
mysql> select json_length('[1,2,3]');
+------------------------+
| json_length('[1,2,3]') |
+------------------------+
| 3 |
+------------------------+
1 row in set (0.01 sec)
mysql> select json_length('{"key":"not a json array"}');
+-------------------------------------------+
| json_length('{"key":"not a json array"}') |
+-------------------------------------------+
| 1 |
+-------------------------------------------+
1 row in set (0.00 sec)
```
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