Pig 错误:无法解析查询
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【中文标题】Pig 错误:无法解析查询【英文标题】:Pig Error : Failed to Parse Query 【发布时间】:2017-10-11 05:14:49 【问题描述】:我正在尝试编写一个过滤器 UDF,它将输入作为 Tuple 并返回 tuple,但是当我在 Gruntt shell 中定义函数时,我收到错误消息,因为无法解析,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 Method) 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)
【问题讨论】:
【参考方案1】:当我尝试时错误来了
DEFINE filDist 'FilterDistrictUdf/FilterDistrict'
没有定义临时函数 filDist ,而是尝试在过滤运算符中直接使用该函数作为
chk1 = FILTER elements by FilterDistrictUdf.FilterDistrict(*)
它工作正常
【讨论】:
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