ygf11 opened a new pull request, #4353:
URL: https://github.com/apache/arrow-datafusion/pull/4353
# Which issue does this PR close?
Closes #2877.
# Rationale for this change
Datafusion support type coercion for expressions, it should also work for
join keys.
# What changes are included in this PR?
In type coercion rule, if the plan is a join:
* Add projection for the input if its column need type coercion.
* Since one column will be casted one more time, the casted key has an
alias.
# Are these changes tested?
Yes, unit test will test it.
# Are there any user-facing changes?
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