sungwy commented on code in PR #1689:
URL: https://github.com/apache/iceberg-python/pull/1689#discussion_r1963684910
##########
pyiceberg/expressions/parser.py:
##########
@@ -90,13 +89,7 @@
@column.set_parse_action
def _(result: ParseResults) -> Reference:
if len(result.column) > 1:
- deprecation_message(
- deprecated_in="0.8.0",
- removed_in="0.9.0",
- help_message="Parsing expressions with table name is deprecated.
Only provide field names in the row_filter.",
- )
- # TODO: Once this is removed, we will no longer take just the last index
of parsed column result
- # And introduce support for parsing filter expressions with nested fields.
+ raise ValueError(f"Cannot parse expressions with table names or nested
fields, got: {".".join(result.column)}")
return Reference(result.column[-1])
Review Comment:
Hello!
There's two missing features in PyIceberg right now with expression parsing:
- Support for parsing field names with "." delimiters
- Support for parsing nested fields
I think @Fokko 's suggested change will make it work for both those cases,
and I think there will be value in testing the Reference binding for both cases
in `tests/expressions/test_expressions.py`.
I can think of three test cases:
```
def test_nested_bind() -> None:
schema = Schema(NestedField(2, "name", StructType(NestedField(3,
"first", StringType()))), schema_id=1)
bound = BoundIsNull(BoundReference(schema.find_field(3),
schema.accessor_for_field(3)))
assert IsNull(Reference("name.first")).bind(schema) == bound
def test_bind_dot_name() -> None:
schema = Schema(NestedField(2, "name.first", StringType()), schema_id=1)
bound = BoundIsNull(BoundReference(schema.find_field(2),
schema.accessor_for_field(2)))
assert IsNull(Reference("name.first")).bind(schema) == bound
def test_bind_ambiguous_name() -> None:
with pytest.raises(ValueError) as exc_info:
schema = Schema(NestedField(2, "name", StructType(NestedField(3,
"first", StringType()))), NestedField(4, "name.first", StringType()),
schema_id=1)
assert "Invalid schema, multiple fields for name name.first: 3 and 4" in
str(exc_info)
## bound = BoundIsNull(BoundReference(schema.find_field(3),
schema.accessor_for_field(3)))
## assert IsNull(Reference("name.first")).bind(schema) == bound
```
Where the last one should throw an error that's propagated from the Schema
having ambiguous names.
I had originally thought that this work would be a lot more complicated
because we would want to distinguish the nested fields from simple field names
with "." delimiters. But I think we can just rely on PyIceberg not supporting
ambiguous field names for now as we introduce nested parsing support
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