org.apache.drill.exec.physical.impl.scan.v3.lifecycle

Class StaticBatchBuilder

java.lang.Object

org.apache.drill.exec.physical.impl.scan.v3.lifecycle.StaticBatchBuilder

Direct Known Subclasses:

StaticBatchBuilder.NullBatchBuilder, StaticBatchBuilder.RepeatedBatchBuilder

public abstract class StaticBatchBuilder
extends Object

Base class for columns that take values based on the reader, not individual rows. E.g. null columns (values are all null) or implicit file columns that take values based on the file.

If a column needs a default value, that value can be set either via the values vector or as a column property on the column schema. The result set loader uses the default value to fill empty values. Otherwise, the column is assumed to be nullable and is filled with nulls.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StaticBatchBuilder.NullBatchBuilder
static class	StaticBatchBuilder.RepeatedBatchBuilder

Field Summary

Fields

Modifier and Type	Field and Description
protected ResultSetLoader	loader
protected TupleMetadata	schema

Constructor Summary

Constructors

Constructor and Description
StaticBatchBuilder(ResultVectorCache vectorCache, TupleMetadata schema)

Method Summary

Modifier and Type	Method and Description
void	close()
VectorContainer	load(int rowCount) Populate static vectors with the defined static values.
protected abstract void	loadBatch(int rowCount)
VectorContainer	outputContainer()
TupleMetadata	schema()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

schema

protected final TupleMetadata schema

loader

protected final ResultSetLoader loader

Constructor Detail

StaticBatchBuilder

public StaticBatchBuilder(ResultVectorCache vectorCache,
                          TupleMetadata schema)

Method Detail

schema

public TupleMetadata schema()

load

public VectorContainer load(int rowCount)

Populate static vectors with the defined static values.

Parameters:

rowCount - number of rows to generate. Must match the row count in the batch returned by the reader

loadBatch

protected abstract void loadBatch(int rowCount)

close

public void close()

outputContainer

public VectorContainer outputContainer()