jackwener opened a new issue, #4174:
URL: https://github.com/apache/arrow-datafusion/issues/4174
**Describe the bug**
> It's from #4141
pushdown project rule don't handle alias. In fact, when handle projection
with alias, we need replace the alias column in new_required_columns, but if we
see the code of this rule, we can find that it didn't consider alias.
For example:
project c1 as c2
tablescan c1.
when we meet project c1 as c2, if new_required_columns include c2, we need
replace it with c1.
**To Reproduce**
Steps to reproduce the behavior:
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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