Description
Introduce a new column vector named `ConstantColumnVector`, it represents a column vector where every row has the same constant value.
It could help improve performance on hidden file metadata columnar file format, since metadata fields for every row in each file are exactly the same, we don't need to copy and keep multiple copies of data.
Attachments
Issue Links
- fixes
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SPARK-37770 Performance improvements for ColumnVector `putByteArray`
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- Resolved
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- links to
