無法使用配置單元查詢結構體字段（CDH 5.9.0）

Question

我只是切換到CDH 5.9.0（全新安裝，而不是升級，在新集羣上）。 我有這樣一個表（更復雜一點，但我這個例子也重現）：

CREATE TABLE `products`(`header` struct<PCODE:string, PNAME:string>) 
PARTITIONED BY (`IMPORT_DATE' string) 
ROW FORMAT SERDE 
    'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' 
STORED AS INPUTFORMAT 
    'org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat' 
OUTPUTFORMAT 
    'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat' 
LOCATION 
    'hdfs://myhost.com:8020/user/hive/warehouse/dbp/products' 
TBLPROPERTIES ('transient_lastDdlTime'='1482160314') 

如果我做的：

SELECT header FROM products; 

==>查詢成功和回報所有產品頭（以JSON格式）

但是，如果我做的：

SELECT header.PCODE FROM products; 

==>它失敗用下面的堆棧跟蹤：

Error: java.lang.RuntimeException: Error in configuring object 
       at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) 
       at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) 
       at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) 
       at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:449) 
       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343) 
       at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164) 
       at java.security.AccessController.doPrivileged(Native Method) 
       at javax.security.auth.Subject.doAs(Subject.java:422) 
       at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698) 
       at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) 
Caused by: java.lang.reflect.InvocationTargetException 
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
       at java.lang.reflect.Method.invoke(Method.java:498) 
       at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) 
       ... 9 more 
Caused by: java.lang.RuntimeException: Error in configuring object 
       at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) 
       at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) 
       at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) 
       at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:38) 
       ... 14 more 
Caused by: java.lang.reflect.InvocationTargetException 
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
       at java.lang.reflect.Method.invoke(Method.java:498) 
       at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) 
       ... 17 more 
Caused by: java.lang.RuntimeException: Map operator initialization failed 
       at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:147) 
       ... 22 more 
Caused by: java.lang.NullPointerException 
       at org.apache.hadoop.hive.ql.exec.ExprNodeFieldEvaluator.initialize(ExprNodeFieldEvaluator.java:61) 
       at org.apache.hadoop.hive.ql.exec.ExprNodeFieldEvaluator.initialize(ExprNodeFieldEvaluator.java:53) 
       at org.apache.hadoop.hive.ql.exec.Operator.initEvaluators(Operator.java:954) 
       at org.apache.hadoop.hive.ql.exec.Operator.initEvaluatorsAndReturnStruct(Operator.java:980) 
       at org.apache.hadoop.hive.ql.exec.SelectOperator.initializeOp(SelectOperator.java:63) 
       at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:385) 
       at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:469) 
       at org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:425) 
       at org.apache.hadoop.hive.ql.exec.TableScanOperator.initializeOp(TableScanOperator.java:193) 
       at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:385) 
       at org.apache.hadoop.hive.ql.exec.MapOperator.initializeOp(MapOperator.java:431) 
       at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:385) 
       at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:126) 
       ... 22 more 

在我的舊集羣（CDH 5.8.2），它工作正常。 有什麼想法？編輯：我已將所有CDH 5.9.0 jar（/ opt/cloudera/parcels/CDH/jars）降級到CDH 5.8.2，並且查詢成功。有可能在CDH 5.9.0迴歸...]

[編輯2：如果表存儲爲TextFile（'org.apache.hadoop.mapred.TextInputFormat'），查詢運行成功。 我們可以認爲這個問題與實木複合地板鏈接]

[也被張貼在了Cloudera論壇：https://community.cloudera.com/t5/Batch-SQL-Apache-Hive/Can-not-query-struct-field-with-hive-CDH-5-9-0/m-p/48672#U48672]

Answer 1

所以我嘗試了很多東西，我結束了以下內容：

-- Struct fieldnames in lowercase 
CREATE TABLE `products`(`header` struct<pcode:string, pname:string>) STORED AS PARQUET; 

選擇結果：

• SELECT header.pcode FROM products ==>OK
• SELECT HEADER.pcode FROM products == >OK
• SELECT header.PCODE FROM products ==>KO
• SELECT HEADER.PCODE FROM products ==>KO

---

-- Struct fieldnames in UPPERCASE 
CREATE TABLE `products`(`header` struct<PCODE:string, PNAME:string>) STORED AS PARQUET; 

選擇結果：

• SELECT header.pcode FROM products ==>KO
• SELECT HEADER.pcode FROM products ==>KO
• SELECT header.PCODE FROM products ==>KO
• SELECT HEADER.PCODE FROM products ==>KO

==>避免大寫在結構字段名與存儲在表PARQUET CDH 5.9.0（它工作在CDH 5.8.2）...

Answer 2

，我會通過對查詢元素降低的情況下解決這個問題。 P.ex：

SELECT標頭。pcode FROM產品;