tustvold opened a new pull request, #6778:
URL: https://github.com/apache/arrow-datafusion/pull/6778
# Which issue does this PR close?
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Part of #3419
# Rationale for this change
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This is the first of what will be a series of PRs to consolidate the type
coercion logic and make it easier to follow. In particular this PR adds the
ability to express type coercion of heterogeneous types, as occurs in
arithmetic. This in turn feeds into the effort to move more of this logic
upstream https://github.com/apache/arrow-rs/issues/3999
# What changes are included in this PR?
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Replaces `coerce_types` with `get_input_types` that returns separate types
for the left and right expressions. It also consolidates the coercion logic in
a single private `signature` function to avoid inconsistency and reduce
repetition.
# Are these changes tested?
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# Are there any user-facing changes?
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