org.apache.hadoop.hive.ql.udf
Class UDFJson

java.lang.Object
  org.apache.hadoop.hive.ql.exec.UDF
      org.apache.hadoop.hive.ql.udf.UDFJson

public class UDFJson
extends UDF

UDFJson.

Constructor Summary

UDFJson()

Method Summary

org.apache.hadoop.io.Text

evaluate(String jsonString, String pathString) Extract json object from a json string based on json path specified, and return json string of the extracted json object.

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

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

Constructor Detail

UDFJson

public UDFJson()

Method Detail

evaluate

public org.apache.hadoop.io.Text evaluate(String jsonString,
                                          String pathString)

Extract json object from a json string based on json path specified, and return json string of the extracted json object. It will return null if the input json string is invalid. A limited version of JSONPath supported: $ : Root object . : Child operator [] : Subscript operator for array * : Wildcard for [] Syntax not supported that's worth noticing: '' : Zero length string as key .. : Recursive descent @ : Current object/element () : Script expression ?() : Filter (script) expression. [,] : Union operator [start:end:step] : array slice operator

Parameters:

jsonString - the json string.

pathString - the json path expression.

Returns:

json string or null when an error happens.