java - pig 错误 : Failed to Parse Query

Question

我正在尝试编写一个过滤器 UDF，它将输入作为元组，并返回元组，但是当我在 Gruntt shell 中定义函数时，我收到错误消息，因为解析失败，我在这里做错了

 REGISTER /home/filterUDF.jar;

 DEFINE filDist  'FilterDistrictUdf/FilterDistrict' 


package FilterDistrictUdf;

import java.io.IOException;

import org.apache.pig.FilterFunc;

import org.apache.pig.data.Tuple;


public class FilterDistrict extends FilterFunc{

@Override
public Boolean exec(Tuple input) throws IOException {
    String line = input.toString();
    String[] columns = line.split(",");
    Double bplObjective = Double.parseDouble(columns[2]);
    Double bplPerformance = Double.parseDouble(columns[10]);



    //Double bplObjective = (Double )input.get(2);
    //Double bplPerformance = (Double )input.get(10);
    //BigInteger mul = new BigInteger("80");
    //BigInteger div = new BigInteger("100");

    if(bplPerformance >= ( (bplObjective* 80)/100) )
        return true;
    else
        return false;


}

错误:

  ERROR 1200: <line 40, column 15>  Syntax error, unexpected symbol at or 
  near ''FilterDistrictUdf/FilterDistrict''

  Failed to parse: <line 40, column 15>  Syntax error, unexpected symbol at 
  or near ''FilterDistrictUdf/FilterDistrict''
   at 

  org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:244)
   at 
  org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:182)
   at org.apache.pig.PigServer$Graph.validateQuery(PigServer.java:1707)
   at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1680)
   at org.apache.pig.PigServer.registerQuery(PigServer.java:623)
   at 
   org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:1063)
   at 

org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:501) 在 org.apache.pig.tools.grunt.GruntParser.parseStopOnError (GruntParser.java:230) 在 org.apache.pig.tools.grunt.GruntParser.parseStopOnError (GruntParser.java:205) 在 org.apache.pig.tools.grunt.Grunt.run(Grunt.java:66) 在 org.apache.pig.Main.run(Main.java:558) 在 org.apache.pig.Main.main(Main.java:170) 在 sun.reflect.NativeMethodAccessorImpl.invoke0( native 方法) 在

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 在

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja 弗吉尼亚州:43) 在 java.lang.reflect.Method.invoke(Method.java:497) 在 org.apache.hadoop.util.RunJar.main(RunJar.java:212)

Answer 1

当我尝试时，错误来了

   DEFINE filDist  'FilterDistrictUdf/FilterDistrict' 

不是定义临时函数 filDist ，而是尝试直接在过滤器运算符中使用该函数作为

    chk1 = FILTER elements by FilterDistrictUdf.FilterDistrict(*)

它工作正常