Airblader commented on a change in pull request #17186:
URL: https://github.com/apache/flink/pull/17186#discussion_r704064726
##########
File path: docs/data/sql_functions.yml
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@@ -708,6 +708,41 @@ json:
-- '[]'
JSON_QUERY('{}', 'strict $.invalid' EMPTY ARRAY ON ERROR)
```
+ - sql: JSON_OBJECT([KEY key VALUE value]* [ { NULL | ABSENT } ON NULL ])
+ table: jsonObject(JsonOnNull, keyValues...)
+ description: |
+ Builds a JSON string from a list of key-value pairs.
+
+ Note that keys must be non-`NULL` string literals, while values may be
arbitrary expressions.
+
+ The `ON NULL` behavior defines how to treat `NULL` values.
+
+ Note that this function only returns a JSON string, not an actual JSON
type. Not all JSON can
Review comment:
(Also, that's just how Calcite implements it, but this is the better
reason to state)
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