GitHub user davlee1972 created a discussion: How to get columns and change
their names in a pyrrow compute expression.
Here is a sample pyarrow compute expression used for filtering data:
```
>>> import pyarrow.compute as pc
>>>
>>> exp = (pc.field("total") > 100) & (pc.field("items") < 10)
>>> exp
<pyarrow.compute.Expression ((total > 100) and (items < 10))>
```
My odd use case is that I need to modify the expression to:
```
>>> import pyarrow.compute as pc
>>>
>>> exp = (pc.field("TOTAL") > 100) & (pc.field("ITEMS") < 10)
>>> exp
<pyarrow.compute.Expression ((TOTAL > 100) and (ITEMS < 10))>
```
Some of my files have lower case column names and some files use upper case
column names. I know which files are upper case vs lower case so I need to take
a pyarrow compute expression using lower case column names including nested
columns in nested conditions and rewrite the expression with all upper case
column names.
GitHub link: https://github.com/apache/arrow/discussions/48927
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