Package com.amazonaws.athena.connector.lambda.data.writers.fieldwriters

Class VarCharFieldWriter

java.lang.Object

com.amazonaws.athena.connector.lambda.data.writers.fieldwriters.VarCharFieldWriter

All Implemented Interfaces:

FieldWriter

public class VarCharFieldWriter
extends Object
implements FieldWriter

Used to write a value and apply constraints for a particular column to the row currently being processed. This interface enables the use of a pseudo-code generator for RowWriter which reduces object and branching overhead when translating from your source system to Apache

For example of how to use this, see ExampleRecordHandler in athena-federation-sdk.

See Also:

FieldWriter

Constructor Summary

Constructors

Constructor	Description
VarCharFieldWriter(VarCharExtractor extractor, org.apache.arrow.vector.VarCharVector vector, ConstraintProjector rawConstraint)	Creates a new instance of this FieldWriter and configures is such that writing a value required minimal branching or secondary operations (metadata lookups, etc..)

Method Summary

Modifier and Type	Method	Description
boolean	write(Object context, int rowNum)	Attempts to write a value to the Apache Arrow vector provided at construction time.

Methods inherited from class java.lang.Object

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

Constructor Detail

VarCharFieldWriter

public VarCharFieldWriter(VarCharExtractor extractor,
                          org.apache.arrow.vector.VarCharVector vector,
                          ConstraintProjector rawConstraint)

Creates a new instance of this FieldWriter and configures is such that writing a value required minimal branching or secondary operations (metadata lookups, etc..)

Parameters:

extractor - The Extractor that can be used to obtain the value for the required column from the context.

vector - The ApacheArrow vector to write the value to.

rawConstraint - The Constraint to apply to the value when returning if the value was valid.

Method Detail

write

public boolean write(Object context,
                     int rowNum)
              throws Exception

Attempts to write a value to the Apache Arrow vector provided at construction time.

Specified by:

write in interface FieldWriter

Parameters:

context - The context (specific to the extractor) from which to extract a value.

rowNum - The row to write the value into.

Returns:

True if the value passed constraints and should be considered valid, False otherwise.

Throws:

Exception - internal exception