alex-natzka opened a new pull request, #3861:
URL: https://github.com/apache/arrow-datafusion/pull/3861
# Which issue does this PR close?
Closes #3635.
# Rationale for this change
If `CommonSubexprEliminate` identifies a common sub-expression used in a
`Filter` node, it will add a projection before a filter which adds a new column
with the common sub-expression. If the `FilterPushdown` is applied afterwards,
the filter can be pushed past the additional projection - now the additional
projection is completely redundant and, instead of optimizing performance,
actually worsens it.
# What changes are included in this PR?
- Move `CommonSubexprEliminate` after `FilterPushdown` in the default
optimization rules.
# Are there any user-facing changes?
No API changes, but optimizing a `LogicalPlan` will in some cases produce a
different (hopefully better) result.
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