Package org.apache.druid.data.input

Class Rows

java.lang.Object

org.apache.druid.data.input.Rows

public final class Rows
extends Object

Method Summary

Modifier and Type	Method	Description
static Number	objectToNumber(String name, Object inputValue, boolean throwParseExceptions)	Shorthand for objectToNumber(String, Object, ValueType, boolean) with null expectedType.
static Number	objectToNumber(String name, Object inputValue, ValueType outputType, boolean throwParseExceptions)	Convert an object to a number.
static List<String>	objectToStrings(Object inputValue)	Convert an object to a list of strings.
static List<Object>	toGroupKey(long timeStamp, InputRow inputRow)

Methods inherited from class java.lang.Object

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

Method Details

toGroupKey

public static List<Object> toGroupKey(long timeStamp,
 InputRow inputRow)

Parameters:

timeStamp - rollup up timestamp to be used to create group key

inputRow - input row

Returns:

groupKey for the given input row

objectToStrings

public static List<String> objectToStrings(Object inputValue)

Convert an object to a list of strings. This function translates single value nulls into an empty list, and any nulls inside of a list or array into the string "null". Do not use this method if you don't want this behavior, but note that many implementations of Row.getDimension(String) do use this method, so it is recommended to use Row.getRaw(String) if you want the actual value without this coercion. For legacy reasons, some stuff counts on this incorrect behavior, (such as toGroupKey(long, InputRow)).

objectToNumber

@Nullable
public static Number objectToNumber(String name,
 Object inputValue,
 @Nullable
 ValueType outputType,
 boolean throwParseExceptions)

Convert an object to a number.

Parameters:

name - field name of the object being converted (may be used for exception messages)

inputValue - the actual object being converted

outputType - expected return type, or null if it should be automatically detected

throwParseExceptions - whether this method should throw a ParseException or use a default/null value when is not numeric

Returns:

a Number; will not necessarily be the same type as

Throws:

ParseException - if the input cannot be converted to a number and throwParseExceptions is true

objectToNumber

public static Number objectToNumber(String name,
 Object inputValue,
 boolean throwParseExceptions)

Shorthand for objectToNumber(String, Object, ValueType, boolean) with null expectedType.