com.zentadata.client

Class ResultSet

java.lang.Object

com.zentadata.client.ResultSet

public class ResultSet
extends Object

The main class to work with a physical data representation of DataFrame.

Field Summary

Fields

Modifier and Type	Field and Description
protected Cursor	cursor

Constructor Summary

Constructors

Constructor and Description
ResultSet(List<Map<String,Object>> payload, Cursor cursor)

Method Summary

Modifier and Type	Method and Description
protected Cursor	getCursor()
Iterator<Map<String,Object>>	getIterator() Returns Iterator to pool all the rows of DataFrame.
<T> Iterator<T>	getIterator(Class<T> clas) Typed version of getIterator() method
List<Map<String,Object>>	getPayload() Returns in-memory List containing first 5000 rows of underlying DataFrame.
<T> List<T>	getPayload(Class<T> clas) Typed version of getPayload() method.
void	show() This method prints first 5000 rows in a human-readable format to the standard output.

Methods inherited from class java.lang.Object

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

Field Detail

cursor

protected final Cursor cursor

Constructor Detail

ResultSet

public ResultSet(List<Map<String,Object>> payload,
                 Cursor cursor)

Method Detail

getCursor

protected Cursor getCursor()

show

public void show()

This method prints first 5000 rows in a human-readable format to the standard output.

getPayload

public List<Map<String,Object>> getPayload()

Returns in-memory List containing first 5000 rows of underlying DataFrame. Each row is represented as Map<String, Object>.

Note: To avoid OOM errors on client side, list size is limited by 5000 rows. If you need to get all rows, consider streaming approach with getIterator() method.

Returns:

List containing first 5000 rows of underlying DataFrame.

getPayload

public <T> List<T> getPayload(Class<T> clas)

Typed version of getPayload() method.

Parameters:

clas - Class used to represent DataFrame's rows in a form of domain object.

Returns:

List containing first 5000 rows of underlying DataFrame.

getIterator

public Iterator<Map<String,Object>> getIterator()

Returns Iterator to pool all the rows of DataFrame. This method is streaming data from a server side to prevent OOM errors while processing large datasets.

Returns:

Iterator of underlying DataFrame rows.

getIterator

public <T> Iterator<T> getIterator(Class<T> clas)

Typed version of getIterator() method

Parameters:

clas - Class used to represent DataFrame's rows in a form of domain object.

Returns:

Iterator of underlying DataFrame rows.