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GH-45948: [C++][Parquet] Variant shredding #50232

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GH-45948: [C++][Parquet] Variant shredding #50232

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162d503
GH-45946: [C++][Parquet] Variant decoding
qzyu999 Jun 26, 2026
f6b8e66
GH-45947: [C++][Parquet] Variant encoding with RAII builders
qzyu999 Jun 26, 2026
034ff49
GH-45948: [C++][Parquet] Variant shredding
qzyu999 Jun 26, 2026
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3 changes: 3 additions & 0 deletions cpp/src/arrow/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -391,6 +391,9 @@ set(ARROW_SRCS
extension/bool8.cc
extension/json.cc
extension/parquet_variant.cc
extension/variant.cc
extension/variant_builder.cc
extension/variant_shredding.cc
extension/uuid.cc
pretty_print.cc
record_batch.cc
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4 changes: 3 additions & 1 deletion cpp/src/arrow/extension/CMakeLists.txt
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Expand Up @@ -15,7 +15,9 @@
# specific language governing permissions and limitations
# under the License.

set(CANONICAL_EXTENSION_TESTS bool8_test.cc json_test.cc uuid_test.cc)
set(CANONICAL_EXTENSION_TESTS bool8_test.cc json_test.cc uuid_test.cc
variant_test.cc variant_builder_test.cc
variant_shredding_test.cc)

if(ARROW_JSON)
list(APPEND CANONICAL_EXTENSION_TESTS tensor_extension_array_test.cc opaque_test.cc)
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4 changes: 3 additions & 1 deletion cpp/src/arrow/extension/meson.build
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Expand Up @@ -15,7 +15,7 @@
# specific language governing permissions and limitations
# under the License.

canonical_extension_tests = ['bool8_test.cc', 'json_test.cc', 'uuid_test.cc']
canonical_extension_tests = ['bool8_test.cc', 'json_test.cc', 'uuid_test.cc', 'variant_test.cc', 'variant_builder_test.cc', 'variant_shredding_test.cc']

if needs_json
canonical_extension_tests += [
Expand All @@ -40,5 +40,7 @@ install_headers(
'parquet_variant.h',
'uuid.h',
'variable_shape_tensor.h',
'variant.h',
'variant_shredding.h',
],
)
5 changes: 4 additions & 1 deletion cpp/src/arrow/extension/parquet_variant.h
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Expand Up @@ -70,7 +70,10 @@ class ARROW_EXPORT VariantExtensionType : public ExtensionType {
std::shared_ptr<Field> value() const { return value_; }

private:
// TODO GH-45948 added shredded_value
// TODO: Track shredded_value field when integrating with Parquet reader.
// The shredding implementation (variant_shredding.h) operates on raw arrays
// externally; a future PR may extend VariantExtensionType to understand
// shredded storage layouts for seamless Parquet I/O integration.
std::shared_ptr<Field> metadata_;
std::shared_ptr<Field> value_;
};
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