ganeshashree commented on code in PR #58034:
URL: https://github.com/apache/spark/pull/58034#discussion_r4057448389
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala:
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@@ -2210,3 +2245,353 @@ case class JsonTypeof(child: Expression)
override protected def withNewChildInternal(newChild: Expression):
JsonTypeof =
copy(child = newChild)
}
+
+/**
+ * The SQL:2016 `JSON_OBJECT` constructor function (feature T811): constructs
a JSON object from
+ * key-value pairs, written `key VALUE value`, `KEY key VALUE value`, `key :
value`, or the
+ * MySQL-style `key, value`.
+ *
+ * Keys must be non-null strings; a null key is an error. The `ON NULL` clause
controls whether
+ * null-valued pairs are included (NULL ON NULL, the standard default) or
omitted (ABSENT ON NULL).
+ *
+ * A value is spliced in raw (unquoted) when it is a lexically nested
`ImplicitlyFormattedAsJson`
+ * producer whose `emitsImplicitJsonText` holds -- a nested JSON constructor,
or `JSON_QUERY` under
+ * KEEP QUOTES -- tracked per member by `rawJson` (see `rawJsonValue`). The
standard's explicit
+ * value-level `FORMAT JSON` clause (e.g. `JSON_OBJECT('a' VALUE '{"b":1}'
FORMAT JSON)`) is
+ * deferred.
+ *
+ * Examples:
+ * JSON_OBJECT('id' VALUE 7, 'name' VALUE 'Ada') ->
'{"id":7,"name":"Ada"}'
+ * JSON_OBJECT('id': 7, 'v': NULL) -> '{"id":7,"v":null}'
+ * JSON_OBJECT('id': 7, 'v': NULL ABSENT ON NULL) -> '{"id":7}'
+ * JSON_OBJECT() -> '{}'
+ *
+ * A flat, clause-free call routes through function resolution and is rebuilt
by
+ * `JsonObjectExpressionBuilder` (so a same-named routine can shadow the
built-in `json_object`); a
+ * clause-bearing or nested form is built directly from the grammar (see
Review Comment:
Done.
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