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[FLINK-40236][python] Fix _infer_type inferring ARRAY<NULL> for a list with a leading None #28819

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[FLINK-40236][python] Fix _infer_type inferring ARRAY<NULL> for a list with a leading None #28819

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[FLINK-40236][python] Add failing test for _infer_type with leading None
nikolauspschuetz Jul 25, 2026
1dc127f
[FLINK-40236][python] Infer array element type from first non-None el…
nikolauspschuetz Jul 25, 2026
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5 changes: 5 additions & 0 deletions flink-python/pyflink/table/tests/test_types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -209,6 +209,11 @@ def test_infer_schema_nulltype(self):
# third column is varchar
self.assertTrue(isinstance(schema.fields[2].data_type, VarCharType))

def test_infer_array_type_with_leading_none(self):
data_type = _infer_type([None, 1])
self.assertTrue(isinstance(data_type, ArrayType))
self.assertTrue(isinstance(data_type.element_type, BigIntType))

def test_infer_schema_not_enough_names(self):
schema = _infer_schema_from_data([["a", "b"]], ["col1"])
self.assertTrue(schema.names, ['col1', '_2'])
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2 changes: 1 addition & 1 deletion flink-python/pyflink/table/types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1491,7 +1491,7 @@ def _infer_type(obj):
elif isinstance(obj, list):
for v in obj:
if v is not None:
return ArrayType(_infer_type(obj[0]))
return ArrayType(_infer_type(v))
else:
return ArrayType(NullType())
elif isinstance(obj, array):
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