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array_to_string() does not support decimal arrays #20552

@neilconway

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@neilconway

Describe the bug

> select array_to_string(arrow_cast(make_array(1.5, NULL, 3.14), 'List(Decimal128(10, 2))'), ',', 'N');
This feature is not implemented: Unsupported data type in array_to_string: Decimal128(10, 2)

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