seddonm1 opened a new pull request #797:
URL: https://github.com/apache/arrow-datafusion/pull/797
# Which issue does this PR close?
Reopens #777.
# Rationale for this change
The previous resolution strategy ignored the qualifications on the columns
if they were present so it required unique column names for resolution. This
one is smarter and allows out-of-order qualified fields in the join condition.
# What changes are included in this PR?
This change makes better use of the information provided to the join logical
plan builder to better resolve column relations. More work could be done to
deal with other 'error' conditions (like referring to the same 'left' relation
twice) but I wanted to get feedback first.
There are still outstanding issues unrelated that i am working through.
# Are there any user-facing changes?
More queries will behave like the SQL standard.
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