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## What changes were proposed in this pull request? Our encoder framework has been evolved a lot, this PR tries to clean up the code to make it more readable and emphasise the concept that encoder should be used as a container of serde expressions. 1. move validation logic to analyzer instead of encoder 2. only have a `resolveAndBind` method in encoder instead of `resolve` and `bind`, as we don't have the encoder life cycle concept anymore. 3. `Dataset` don't need to keep a resolved encoder, as there is no such concept anymore. bound encoder is still needed to do serialization outside of query framework. 4. Using `BoundReference` to represent an unresolved field in deserializer expression is kind of weird, this PR adds a `GetColumnByOrdinal` for this purpose. (serializer expression still use `BoundReference`, we can replace it with `GetColumnByOrdinal` in follow-ups) ## How was this patch tested? existing test Author: Wenchen Fan <wenchen@databricks.com> Author: Cheng Lian <lian@databricks.com> Closes #13269 from cloud-fan/clean-encoder. |
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