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* [Feature](Variant) Implement variant new sub column access method The query SELECT v["a"]["b"] from simple_var WHERE cast(v["a"]["b"] as int) = 1 encompasses three primary testing scenarios: ``` 1. A basic test involving the variant data type. 2. A scenario dealing with GitHub event data in the context of a variant. 3. A case related to the TPC-H benchmark using a variant. ```