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GH-48642: [Ruby] Add support for reading decimal128 array #48643

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Merged
kou merged 1 commit into from
Dec 31, 2025
+208 −63
Merged

GH-48642: [Ruby] Add support for reading decimal128 array #48643

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37 changes: 37 additions & 0 deletions ruby/red-arrow-format/lib/arrow-format/array.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@
# specific language governing permissions and limitations
# under the License.

require "bigdecimal"

require_relative "bitmap"

module ArrowFormat
Expand Down Expand Up @@ -306,6 +308,41 @@ def to_a
end
end

class DecimalArray < FixedSizeBinaryArray
end

class Decimal128Array < DecimalArray
def to_a
byte_width = @type.byte_width
buffer_types = [:u64, :s64] # TODO: big endian support
values = 0.step(@size * byte_width - 1, byte_width).collect do |offset|
@values_buffer.get_values(buffer_types, offset)
end
apply_validity(values).collect do |value|
if value.nil?
nil
else
low, high = value
BigDecimal(format_value(low, high))
end
end
end

private
def format_value(low, high)
width = @type.precision
width += 1 if high < 0
value = (high << 64) + low
string = value.to_s.ljust(width, "0")
if @type.scale < 0
string << ("0" * -@type.scale)
elsif @type.scale > 0
string[-@type.scale, 0] = "."
end
string
end
end

class VariableSizeListArray < Array
def initialize(type, size, validity_buffer, offsets_buffer, child)
super(type, size, validity_buffer)
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6 changes: 6 additions & 0 deletions ruby/red-arrow-format/lib/arrow-format/readable.rb
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Expand Up @@ -25,6 +25,7 @@
require_relative "org/apache/arrow/flatbuf/bool"
require_relative "org/apache/arrow/flatbuf/date"
require_relative "org/apache/arrow/flatbuf/date_unit"
require_relative "org/apache/arrow/flatbuf/decimal"
require_relative "org/apache/arrow/flatbuf/duration"
require_relative "org/apache/arrow/flatbuf/fixed_size_binary"
require_relative "org/apache/arrow/flatbuf/floating_point"
Expand Down Expand Up @@ -166,6 +167,11 @@ def read_field(fb_field)
type = LargeUTF8Type.singleton
when Org::Apache::Arrow::Flatbuf::FixedSizeBinary
type = FixedSizeBinaryType.new(fb_type.byte_width)
when Org::Apache::Arrow::Flatbuf::Decimal
case fb_type.bit_width
when 128
type = Decimal128Type.new(fb_type.precision, fb_type.scale)
end
end
Field.new(fb_field.name, type, fb_field.nullable?)
end
Expand Down
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