Fokko commented on code in PR #965:
URL: https://github.com/apache/iceberg-python/pull/965#discussion_r1707389618
##########
tests/expressions/test_parser.py:
##########
@@ -199,3 +199,7 @@ def test_with_function() -> None:
parser.parse("foo = 1 and lower(bar) = '2'")
assert "Expected end of text, found 'and'" in str(exc_info)
+
+
+def test_nested_field_equality() -> None:
+ assert EqualTo("foo.first", "a") == parser.parse("foo.first == 'a'")
Review Comment:
> I think we first have to come up with a proposal for representing nested
fields in a flat string that doesn't result in these edge cases, or is at least
configurable (e.g. Config parameter PYICEBERG__NESTED_FIELD_DELIMITER defined
at the session level that defaults to `.`)
I think the key to success is to have some kind of syntax for quoting
literals. For example:
https://spark.apache.org/docs/latest/sql-ref-literals.html
Then we can parse something like:
```python
'a.b' -> Reference(('a.b',))
'a.b'.c -> Reference(('a.b', 'c'))
a.b.c -> Reference(('a', 'b', 'c'))
```
Or folks have to use:
```python
row_filter=EqualTo(('a.b',), 123)
row_filter=EqualTo(('a.b', 'c'), 123)
row_filter=EqualTo(('a', 'b', 'c'), 123)
```
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