retikulum opened a new pull request, #4352:
URL: https://github.com/apache/arrow-datafusion/pull/4352
# Which issue does this PR close?
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This is discussed in #3152.
# Rationale for this change
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This is the new PR of improving error handling for downcasting. In #4261 we
found out that there is a `downcast_value!` macro which also covers our casting
functions. Implementing `as_xxx_array` function with `downcast_value!` is
nearly decided for now for future PRs.
# What changes are included in this PR?
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- Refactor previous casting functions.
- Add some more types for downcasting.
- I remove some macros and use my downcasting functions in
[string_expression.rs](https://github.com/apache/arrow-datafusion/blob/master/datafusion/physical-expr/src/string_expressions.rs).
Please review it carefully. I don't want to break crucial parts.
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