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https://issues.apache.org/jira/browse/HIVE-16317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15975211#comment-15975211
]
Vineet Garg commented on HIVE-16317:
------------------------------------
Looks good.
> CASE .. NULL in JOIN condition can trigger SemanticException
> ------------------------------------------------------------
>
> Key: HIVE-16317
> URL: https://issues.apache.org/jira/browse/HIVE-16317
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
> Attachments: HIVE-16317.01.patch
>
>
> {noformat}
> hive> explain select a.key from src a join src b on case when a.key=b.key
> then 1 else null end;
> FAILED: SemanticException tok_null encountered with 0 children
> {noformat}
> {noformat}
> "2489e686-bf69-4f37-b733-72491351644b main"
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondPopulateAlias(SemanticAnalyzer.java:2629)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondition(SemanticAnalyzer.java:2904)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondition(SemanticAnalyzer.java:2808)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genJoinTree(SemanticAnalyzer.java:8916)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:10506)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:10419)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.genOPTree(CalcitePlanner.java:408)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:11119)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:286)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:258)
> at
> org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:165)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:258)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:511)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1316)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1456)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1236)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1226)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:233)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:184)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
> at
> org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:821)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java)
> 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.RunJar.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> {noformat}
> In HIVE-15708 this causes query31 to fail CBO optimization.
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