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https://issues.apache.org/jira/browse/HIVE-28362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17863194#comment-17863194
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Stamatis Zampetakis commented on HIVE-28362:
--------------------------------------------
I think the behavior is expected and not a bug. There is no possible way to
infer the type of the "null" column so we cannot pick the correct type for
materializing it. Please check HIVE-11217 for more context.
Even without materialization, the query is quite ambiguous since we cannot
derive the type of the result.
> Fail to materialize a CTE with VOID
> -----------------------------------
>
> Key: HIVE-28362
> URL: https://issues.apache.org/jira/browse/HIVE-28362
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Affects Versions: 4.0.0
> Reporter: Shohei Okumiya
> Assignee: Shohei Okumiya
> Priority: Major
> Labels: pull-request-available
>
> CTE materialization fails when it includes a NULL literal.
> {code:java}
> set hive.optimize.cte.materialize.full.aggregate.only=false;
> set hive.optimize.cte.materialize.threshold=2;
> WITH x AS (SELECT null AS null_value)
> SELECT * FROM x UNION ALL SELECT * FROM x; {code}
> Error message.
> {code:java}
> org.apache.hadoop.hive.ql.parse.SemanticException: CREATE-TABLE-AS-SELECT
> creates a VOID type, please use CAST to specify the type, near field:
> null_value
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.deriveFileSinkColTypes(SemanticAnalyzer.java:8344)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.deriveFileSinkColTypes(SemanticAnalyzer.java:8303)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genFileSinkPlan(SemanticAnalyzer.java:7846)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPostGroupByBodyPlan(SemanticAnalyzer.java:11598)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genBodyPlan(SemanticAnalyzer.java:11461)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:12397)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:12263)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.genOPTree(CalcitePlanner.java:638)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:13136)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:465)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.materializeCTE(CalcitePlanner.java:1062)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getMetaData(SemanticAnalyzer.java:2390)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getMetaData(SemanticAnalyzer.java:2338)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getMetaData(SemanticAnalyzer.java:2340)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getMetaData(SemanticAnalyzer.java:2501)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getMetaData(SemanticAnalyzer.java:2323)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genResolvedParseTree(SemanticAnalyzer.java:12978)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:13085)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:465)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:332)
> at org.apache.hadoop.hive.ql.Compiler.analyze(Compiler.java:224)
> at org.apache.hadoop.hive.ql.Compiler.compile(Compiler.java:109)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:508) {code}
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