[HIVE-9113] Explain on query failed with NPE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Component/s: Query Processor
• Assignee: Navis Ryu
• Reporter: Chao Sun
• Created: 15/Dec/14 23:37
• Updated: 23/Oct/19 16:15
• Resolved: 18/Dec/14 06:41

Description

Run explain on the following query:

select p.p_partkey, li.l_suppkey
from (select distinct l_partkey as p_partkey from lineitem) p join lineitem li on p.p_partkey = li.l_partkey
where li.l_linenumber = 1 and
 li.l_orderkey in (select l_orderkey where l_linenumber = li.l_linenumber)
;

gave me NPE:

java.lang.NullPointerException
  at org.apache.hadoop.hive.ql.parse.QBSubQuery.validateAndRewriteAST(QBSubQuery.java:516)
  at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genFilterPlan(SemanticAnalyzer.java:2605)
  at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genBodyPlan(SemanticAnalyzer.java:8866)
  at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9745)
  at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9638)
  at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10125)
  at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:221)
  at org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:74)
  at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:221)
  at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:420)
  at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:306)
  at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1108)
  at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1170)
  at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1045)
  at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1035)
  at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:199)
  at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:151)
  at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:362)
  at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:720)
  at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:639)
  at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:578)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at org.apache.hadoop.util.RunJar.main(RunJar.java:212)

Is this query invalid? If so, it should at least give some explanations, not just a plain NPE message, and left user clueless.