Class VectorizedArrowReader.ConstantVectorReader<T>
- java.lang.Object
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- org.apache.iceberg.arrow.vectorized.VectorizedArrowReader
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- org.apache.iceberg.arrow.vectorized.VectorizedArrowReader.ConstantVectorReader<T>
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- Type Parameters:
T
- The constant value to use
- All Implemented Interfaces:
VectorizedReader<VectorHolder>
- Enclosing class:
- VectorizedArrowReader
public static class VectorizedArrowReader.ConstantVectorReader<T> extends VectorizedArrowReader
A Dummy Vector Reader which doesn't actually read files, instead it returns a dummy VectorHolder which indicates the constant value which should be used for this column.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.iceberg.arrow.vectorized.VectorizedArrowReader
VectorizedArrowReader.ConstantVectorReader<T>
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Field Summary
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Fields inherited from class org.apache.iceberg.arrow.vectorized.VectorizedArrowReader
DEFAULT_BATCH_SIZE
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Constructor Summary
Constructors Constructor Description ConstantVectorReader(T value)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description VectorHolder
read(VectorHolder reuse, int numValsToRead)
Reads a batch of type @param <T> and of size numRowsvoid
setBatchSize(int batchSize)
void
setRowGroupInfo(org.apache.parquet.column.page.PageReadStore source, java.util.Map<org.apache.parquet.hadoop.metadata.ColumnPath,org.apache.parquet.hadoop.metadata.ColumnChunkMetaData> metadata, long rowPosition)
Sets the row group information to be used with this readerjava.lang.String
toString()
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Methods inherited from class org.apache.iceberg.arrow.vectorized.VectorizedArrowReader
close, nulls, positions, positionsWithSetArrowValidityVector
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Constructor Detail
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ConstantVectorReader
public ConstantVectorReader(T value)
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Method Detail
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read
public VectorHolder read(VectorHolder reuse, int numValsToRead)
Description copied from interface:VectorizedReader
Reads a batch of type @param <T> and of size numRows- Specified by:
read
in interfaceVectorizedReader<T>
- Overrides:
read
in classVectorizedArrowReader
- Parameters:
reuse
- container for the last batch to be reused for next batchnumValsToRead
- number of rows to read- Returns:
- batch of records of type @param <T>
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setRowGroupInfo
public void setRowGroupInfo(org.apache.parquet.column.page.PageReadStore source, java.util.Map<org.apache.parquet.hadoop.metadata.ColumnPath,org.apache.parquet.hadoop.metadata.ColumnChunkMetaData> metadata, long rowPosition)
Description copied from interface:VectorizedReader
Sets the row group information to be used with this reader- Specified by:
setRowGroupInfo
in interfaceVectorizedReader<T>
- Overrides:
setRowGroupInfo
in classVectorizedArrowReader
- Parameters:
source
- row group information for all the columnsmetadata
- map ofColumnPath
->ColumnChunkMetaData
for the row grouprowPosition
- the row group's row offset in the parquet file
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toString
public java.lang.String toString()
- Overrides:
toString
in classVectorizedArrowReader
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setBatchSize
public void setBatchSize(int batchSize)
- Specified by:
setBatchSize
in interfaceVectorizedReader<T>
- Overrides:
setBatchSize
in classVectorizedArrowReader
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