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GH-49119: [Ruby] Add support for writing map array #49120

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Merged
kou merged 1 commit into from
Feb 3, 2026
+27 −0
Merged

GH-49119: [Ruby] Add support for writing map array #49120

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4 changes: 4 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 @@ -791,6 +791,10 @@ def name
def build_array(size, validity_buffer, offsets_buffer, child)
MapArray.new(self, size, validity_buffer, offsets_buffer, child)
end

def to_flatbuffers
FB::Map::Data.new
end
end

class UnionType < Type
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23 changes: 23 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 @@ -85,6 +85,8 @@ def convert_type(red_arrow_type)
red_arrow_type.scale)
when Arrow::FixedSizeBinaryDataType
ArrowFormat::FixedSizeBinaryType.new(red_arrow_type.byte_width)
when Arrow::MapDataType
ArrowFormat::MapType.new(convert_field(red_arrow_type.field))
when Arrow::ListDataType
ArrowFormat::ListType.new(convert_field(red_arrow_type.field))
when Arrow::LargeListDataType
Expand Down Expand Up @@ -823,6 +825,27 @@ def test_write
end
end

sub_test_case("Map") do
def build_array
data_type = Arrow::MapDataType.new(:string, :int8)
Arrow::MapArray.new(data_type,
[
{"a" => -128, "b" => 127},
nil,
{"c" => nil},
])
end

def test_write
assert_equal([
{"a" => -128, "b" => 127},
nil,
{"c" => nil},
],
@values)
end
end

sub_test_case("Struct") do
def build_array
data_type = Arrow::StructDataType.new(count: :int8,
Expand Down
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