[C++][Parquet] Add variant support
Open
Component: C++
Type: enhancement
- Dominant language
- C++
- Stars
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- Avg merge
- 3d 13h
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Description
### Describe the enhancement requested
Variant encoding spec: https://github.com/apache/parquet-format/blob/d784f11f4485e64fdeaa614e0bde125f5132093d/VariantEncoding.md
Variant shredding spec: https://github.com/apache/parquet-format/blob/d784f11f4485e64fdeaa614e0bde125f5132093d/VariantShredding.md
Loose order of steps:
1. https://github.com/apache/arrow/issues/46104
2. https://github.com/apache/arrow/issues/45946
4. https://github.com/apache/arrow/issues/45947
5. https://github.com/apache/arrow/issues/45948
### Component(s)
Parquet, C++
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Assessment
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