feat(function): Support Semi-structured access elements

[b41sh]

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Summary

Support accessing elements of VARIANT, ARRAY, OBJECT by key or index
for example

mysql> create table test (v variant);
mysql> insert into test select parse_json('{"a":{"k":"v"},"b":[1,2,3]}');
mysql> select v["a"]["k"], v:a:k, v:a.k, v["b"][0], v:b[0] from test;
+---------------------------+--------------------+--------------------+-------------------------+---------------------+
| get_path(v, '["a"]["k"]') | get_path(v, 'a:k') | get_path(v, 'a.k') | get_path(v, '["b"][0]') | get_path(v, 'b[0]') |
+---------------------------+--------------------+--------------------+-------------------------+---------------------+
| "v"                       | "v"                | "v"                | 1                       | 1                   |
+---------------------------+--------------------+--------------------+-------------------------+---------------------+
1 row in set (0.06 sec)

Changelog

• New Feature

Related Issues

#3916

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