madhushreeag commented on code in PR #40677:
URL: https://github.com/apache/superset/pull/40677#discussion_r3352480226
##########
superset/db_engine_specs/base.py:
##########
@@ -1304,6 +1304,38 @@ def get_datatype(cls, type_code: Any) -> str | None:
return type_code.upper()
return None
+ @classmethod
+ def normalize_column_values(cls, col_values: list[Any]) -> list[Any]:
+ """
+ Engine-specific hook to normalize column values before PyArrow
conversion.
+
+ Called when the initial pa.array() conversion raises an exception,
giving
+ the engine a chance to clean up values (e.g. replace sentinel strings
with
+ None) before a second conversion attempt.
+
+ :param col_values: Raw Python values for one column
+ :return: Normalized values; return the input list unchanged by default
+ """
+ return col_values
+
+ @classmethod
+ def resolve_column_type(
+ cls, cursor_type: str | None, pa_mapped: str | None
+ ) -> str | None:
+ """
+ Choose the reported column type from the cursor description type and
the
+ type inferred by PyArrow.
+
+ The default prefers the cursor description when available. Override in
+ engine specs where the cursor description is unreliable (e.g. pydruid
+ infers STRING from a None or special-float first row value).
+
+ :param cursor_type: Type string from the cursor description, or None
+ :param pa_mapped: Type string inferred by PyArrow, or None
+ :return: The type string to report for this column
+ """
+ return cursor_type or pa_mapped
Review Comment:
Added the tests in tests/unit_tests/db_engine_specs/test_druid.py to keep
result_set.py decoupled from the individual engine peculiarities
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