`asc` and `desc` are not regular functions. They are indicators for the sort
order and converted into special `Ordering` expressions. Without special
treatment, they are converted into `Call("asc", fieldRef)` and therefore not
correctly handled by `Table.orderBy()` which expects `Ordering` expressions.
This PR adds code that was (accidentially?) dropped when refactoring the
`ExpressionParser` in 9244106b334ef54ba3e39a3f2c0c76f46ae4ecd3.
[ Full content available at: https://github.com/apache/flink/pull/6585 ]
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