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GH-49055: [Ruby] Add support for writing decimal128/256 arrays #49056

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Merged
kou merged 1 commit into from
Jan 30, 2026
Merged

GH-49055: [Ruby] Add support for writing decimal128/256 arrays #49056

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8 changes: 8 additions & 0 deletions ruby/red-arrow-format/lib/arrow-format/type.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -627,6 +627,14 @@ def initialize(byte_width, precision, scale)
@precision = precision
@scale = scale
end

def to_flatbuffers
fb_type = FB::Decimal::Data.new
fb_type.bit_width = @byte_width * 8
fb_type.precision = @precision
fb_type.scale = @scale
fb_type
end
end

class Decimal128Type < DecimalType
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62 changes: 62 additions & 0 deletions ruby/red-arrow-format/test/test-writer.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,12 @@ def convert_type(red_arrow_type)
ArrowFormat::UTF8Type.singleton
when Arrow::LargeStringDataType
ArrowFormat::LargeUTF8Type.singleton
when Arrow::Decimal128DataType
ArrowFormat::Decimal128Type.new(red_arrow_type.precision,
red_arrow_type.scale)
when Arrow::Decimal256DataType
ArrowFormat::Decimal256Type.new(red_arrow_type.precision,
red_arrow_type.scale)
when Arrow::FixedSizeBinaryDataType
ArrowFormat::FixedSizeBinaryType.new(red_arrow_type.byte_width)
else
Expand Down Expand Up @@ -444,6 +450,62 @@ def test_write
@values)
end
end

sub_test_case("Decimal128") do
def build_array
@positive_small = "1.200"
@positive_large = ("1234567890" * 3) + "12345.678"
@negative_small = "-1.200"
@negative_large = "-" + ("1234567890" * 3) + "12345.678"
Arrow::Decimal128Array.new({precision: 38, scale: 3},
[
@positive_large,
@positive_small,
nil,
@negative_small,
@negative_large,
])
end

def test_write
assert_equal([
BigDecimal(@positive_large),
BigDecimal(@positive_small),
nil,
BigDecimal(@negative_small),
BigDecimal(@negative_large),
],
@values)
end
end

sub_test_case("Decimal256") do
def build_array
@positive_small = "1.200"
@positive_large = ("1234567890" * 7) + "123.456"
@negative_small = "-1.200"
@negative_large = "-" + ("1234567890" * 7) + "123.456"
Arrow::Decimal256Array.new({precision: 76, scale: 3},
[
@positive_large,
@positive_small,
nil,
@negative_small,
@negative_large,
])
end

def test_write
assert_equal([
BigDecimal(@positive_large),
BigDecimal(@positive_small),
nil,
BigDecimal(@negative_small),
BigDecimal(@negative_large),
],
@values)
end
end
end
end
end
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