Dandandan opened a new pull request #268:
URL: https://github.com/apache/arrow-datafusion/pull/268
# Which issue does this PR close?
Closes #264
# Rationale for this change
SQL planning to logical plan had a wrong rule: whenever the schema fields
names were equal, it applies an "optimization" to remove the projection.
I found this while working on the `SELECT DISTINCT`.
If we want to have an optimization pass like this, it should look at whether
the expressions are equal instead and I think it would be better to include as
a real optimization rule instead of while building the logical plan from the
query.
# What changes are included in this PR?
Skip the "optimization".
# Are there any user-facing changes?
No.
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