pitrou commented on a change in pull request #9948:
URL: https://github.com/apache/arrow/pull/9948#discussion_r609651237
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File path: python/pyarrow/tests/test_convert_builtin.py
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@@ -1501,6 +1501,23 @@ def test_sequence_decimal_too_high_precision():
pa.array([decimal.Decimal('1' * 80)])
+def test_sequence_decimal_infer():
+ # ARROW-12150 - ensure mixed precision gets correctly inferred to
+ # common type that can hold all input values
+ cases = [
+ ([decimal.Decimal('1.234'), decimal.Decimal('3.456')],
+ pa.decimal128(4, 3)),
+ ([decimal.Decimal('1.234'), decimal.Decimal('456.7')],
+ pa.decimal128(6, 3)),
+ ([decimal.Decimal('123.4'), decimal.Decimal('4.567')],
+ pa.decimal128(6, 3)),
+ ]
Review comment:
What about e.g. `[Decimal('123e2'), Decimal('4567e3')]`?
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