spark技术分享RowToUnsafeRowDataReaderFactory
RowToUnsafeRowDataReaderFactory is a DataReaderFactory of UnsafeRows.
RowToUnsafeRowDataReaderFactory is created exclusively when DataSourceV2ScanExec physical operator is requested for reader factories.
preferredLocations Method
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preferredLocations: Array[String] |
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Note
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preferredLocations is part of DataReaderFactory Contract to…FIXME.
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preferredLocations simply requests rowReaderFactory for preferredLocations.
createDataReader Method
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createDataReader: DataReader[UnsafeRow] |
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Note
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createDataReader is part of DataReaderFactory Contract to…FIXME.
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createDataReader…FIXME
