(First posts!)Apache Pig - 在腳本中多次調用Java UDF ToJSON
我一直在玩一個簡單的例子數據集。簡歷對象有點複雜,有多個子對象。對於我計劃的當前階段,我試圖通過將子對象存儲爲JSON字符串來壓扁數據集。我遇到了ToJSON UDF的模式問題。 (https://github.com/rjurney/pig-to-json)
如果我做了下面的語句在我的豬劇本,我得到正確的在我的領域數據,但它重用所有ToJSson()調用位置字段名稱:
stringifiedJSON =
FOREACH fullJSON
GENERATE
id .. TotalYears,
com.hortonworks.pig.udf.ToJson(Awards) AS Awards:chararray,
com.hortonworks.pig.udf.ToJson(Certifications) AS Certifications:chararray,
CASE WHEN Degrees IS NULL THEN ‘[]’ ELSE com.hortonworks.pig.udf.ToJson(Degrees) END AS Degrees:chararray,
com.hortonworks.pig.udf.ToJson(Links) AS Links:chararray,
com.hortonworks.pig.udf.ToJson(Groups) AS Groups:chararray,
com.hortonworks.pig.udf.ToJson(MilitaryService) AS MilitaryService:chararray,
com.hortonworks.pig.udf.ToJson(Positions) AS Positions:chararray;
如果我描述了「fullJSON」數據集,這是我得到的回報(「...」其他領域不討論真正相關):
fullJSON:
{
id: chararray,
..
Awards: {award: (AwardDate: chararray,AwardDescription: chararray,AwardTitle: chararray)},
Certifications: {certification: (CertDescription: chararray,CertEndDate: chararray,CertStartDate: chararray,CertTitle: chararray)},
…
Degrees: {(DegreeTitle: chararray,DegreeEndDate: chararray,DegreeStartDate: chararray,School: chararray,SchoolCity: chararray,SchoolState: chararray,DegreeEducationLevel: chararray)},
…
Links: {link: (LinkTitle: chararray,LinkURL: chararray)},
Groups: {group: (GroupDescription: chararray,GroupEndDate: chararray,GroupStartDate: chararray,GroupTitle: chararray)},
…
MilitaryService: {military_service: (MilitaryBranch: chararray,MilitaryCommendations: chararray,MilitaryCountry: chararray,MilitaryDescripton: chararray,MilitaryStartDate: chararray,MilitaryEndDate: chararray,MilitaryRank: chararray)},
…
Positions: {(Company: chararray,CompanyCity: chararray,CompanyState: chararray,JobStartDate: chararray,JobEndDate: chararray,JobTitle: chararray,IsCurrentTitle: int)},
…
}
任何人有什麼想法?我嘗試將ToJson()調用分成各自的步驟,但我得到了相同的結果。
我後來玩了一下ToJSON.java的源代碼,我想我已經縮小到了下面的代碼範圍。在此之後,我立即添加了strSchema的日誌輸出,並且它總是返回相同的信息(位置信息)。
if (myProperties == null) {
// Retrieve our class specific properties from UDFContext
myProperties = UDFContext.getUDFContext().getUDFProperties(this.getClass());
}
String strSchema = myProperties.getProperty("horton.json.udf.schema");
下面是stringifiedJSON輸出的一個樣本:
{
"id":"http://something.com/some_guy",
...
"Awards":"[]",
"Certifications":"[]",
"Degrees":"[{\"CompanyState\":null,\"CompanyCity\":null,\"JobEndDate\":\"\",\"IsCurrentTitle\":\"Bachelor's Degree\",\"JobTitle\":\"\",\"Company\":\"BS in Marketing\",\"JobStartDate\":\"State University\"}]",
"Links":"[]",
"Groups":"[]",
"MilitaryService":"[]",
"Positions":"[{\"CompanyState\":\"AZ\",\"CompanyCity\":\"Scottsdale\",\"JobEndDate\":\"2010-03-01T00:00:00.000Z\",\"IsCurrentTitle\":0,\"JobTitle\":\"Job runner\",\"Company\":\"somecompany\",\"JobStartDate\":\"2005-06-01T00:00:00.000Z\"},{\"CompanyState\":\"AZ\",\"CompanyCity\":\"Scottsdale\",\"JobEndDate\":\"2010-03-01T00:00:00.000Z\",\"IsCurrentTitle\":0,\"JobTitle\":\"Sales Rep\",\"Company\":\"Company2\",\"JobStartDate\":\"2005-06-01T00:00:00.000Z\"},{\"CompanyState\":\"AZ\",\"CompanyCity\":\"Phoenix\",\"JobEndDate\":\"2004-12-01T00:00:00.000Z\",\"IsCurrentTitle\":0,\"JobTitle\":\"Job 3\",\"Company\":\"Company3\",\"JobStartDate\":\"1991-05-01T00:00:00.000Z\"},{\"CompanyState\":\"AZ\",\"CompanyCity\":\"Phoenix\",\"JobEndDate\":\"2004-12-01T00:00:00.000Z\",\"IsCurrentTitle\":0,\"JobTitle\":\"CompanyRep\",\"Company\":\"Company4\",\"JobStartDate\":\"1991-05-01T00:00:00.000Z\"},{\"CompanyState\":\"AZ\",\"CompanyCity\":\"Phoenix\",\"JobEndDate\":null,\"IsCurrentTitle\":null,\"JobTitle\":\"Job5\",\"Company\":\"Company5\",\"JobStartDate\":\"2014-09-01T00:00:00.000Z\"}]"
}