Describe the bug

Using datafusion-proto to serialize a plan such as:

Filter: WOW_SUCH_TABLE.a > Int64(10) AND WOW_SUCH_TABLE.B < Int64(100)
  TableScan: WOW_SUCH_TABLE projection=[a, B], partial_filters=[WOW_SUCH_TABLE.a > Int64(10), WOW_SUCH_TABLE.B < Int64(100)]

And then deserializing it results in a different plan:

Filter: wow_such_table.a > Int64(10) AND wow_such_table.B < Int64(100)
  TableScan: WOW_SUCH_TABLE projection=[a, B], partial_filters=[wow_such_table.a > Int64(10), wow_such_table.B < Int64(100)]

Note that the TableReference in the TableScan is intact, but the expression's Column is now normalized (downcased). This has nothing to do with enable_ident_normalization, because we're well past the SQL parser at this point.

The issue seems to be here:

Because that calls Column::new, which takes an Into<TableReference>; and impl From<String> for TableReference normalizes.

To Reproduce

No response

Expected behavior

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Additional context

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