Package org.apache.drill.exec.store.easy.json.loader

Class NullFieldParser

java.lang.Object

org.apache.drill.exec.store.easy.json.parser.AbstractElementParser

org.apache.drill.exec.store.easy.json.parser.NullValueParser

org.apache.drill.exec.store.easy.json.loader.NullFieldParser

All Implemented Interfaces:

ElementParser

public class NullFieldParser
extends NullValueParser

Parser for a field that contains only nulls. Waits, consuming nulls, until a non-null value appears, after which this parser is replaced by the "resolved" parser. The loader will force resolution at the end of the batch if no actual values are seen before then.

Field Summary

Fields inherited from class org.apache.drill.exec.store.easy.json.parser.NullValueParser

key

Constructor Summary

Constructors

Constructor	Description
NullFieldParser(TupleParser tupleParser, String key)

Method Summary

Modifier and Type	Method	Description
void	forceResolution()
protected ElementParser	resolve(TokenIterator tokenizer)	The column type is now known from context.

Methods inherited from class org.apache.drill.exec.store.easy.json.parser.NullValueParser

parse

Methods inherited from class org.apache.drill.exec.store.easy.json.parser.AbstractElementParser

errorFactory, structParser

Methods inherited from class java.lang.Object

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

Constructor Details

NullFieldParser

public NullFieldParser(TupleParser tupleParser,
 String key)

Method Details

forceResolution

public void forceResolution()

resolve

protected ElementParser resolve(TokenIterator tokenizer)

The column type is now known from context. Create a new scalar column, writer and parser to replace this parser.

Specified by:

resolve in class NullValueParser