jonathanc-n opened a new pull request, #15862:
URL: https://github.com/apache/datafusion/pull/15862
## Which issue does this PR close?
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part of #13385
## Rationale for this change
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Adds AST -> MERGE logical plan.
## What changes are included in this PR?
The rationale is that the Merge node will emit a Join plan and case
expressions. Both sides of the join will emit a column of null/not nulls to be
able to match/not match on each row.
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