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Posted to issues-all@impala.apache.org by "Aman Sinha (Jira)" <ji...@apache.org> on 2020/04/08 00:56:00 UTC
[jira] [Work started] (IMPALA-9620) Predicates in the SELECT and
GROUP-BY cause failure with CNF rewrite enabled
[ https://issues.apache.org/jira/browse/IMPALA-9620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on IMPALA-9620 started by Aman Sinha.
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> Predicates in the SELECT and GROUP-BY cause failure with CNF rewrite enabled
> ----------------------------------------------------------------------------
>
> Key: IMPALA-9620
> URL: https://issues.apache.org/jira/browse/IMPALA-9620
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 3.4.0
> Reporter: Aman Sinha
> Assignee: Aman Sinha
> Priority: Major
>
> Predicates can appear in the SELECT and GROUP BY list as part of IF(), CASE() clauses.
> When enable_cnf_rewrites is set to true, such queries encounter failure during planning as shown below. Queries run successfully when the flag is disabled.
> Note that the predicate does not have to be disjunctive predicate for this failure to occur..even other types of predicates repro the issue.
> {noformat}
> set enable_cnf_rewrites = true;
> select l_quantity, if(l_quantity < 5 or l_quantity > 45, 'invalid', 'valid') from lineitem group by l_quantity, if(l_quantity < 5 or l_quantity > 45, 'invalid', 'valid') limit 5
> ERROR: IllegalStateException: null
> {noformat}
> Stack trace:
> {noformat}
> I0407 17:40:40.306650 31240 jni-util.cc:288] 2741e90d2edac592:c625a35f00000000] java.lang.IllegalStateException
> at com.google.common.base.Preconditions.checkState(Preconditions.java:492)
> at org.apache.impala.analysis.SlotRef.getIdsHelper(SlotRef.java:229)
> at org.apache.impala.analysis.Expr.getIdsHelper(Expr.java:1286)
> at org.apache.impala.analysis.Expr.getIdsHelper(Expr.java:1286)
> at org.apache.impala.analysis.Expr.getIds(Expr.java:1279)
> at org.apache.impala.rewrite.ConvertToCNFRule.convertToCNF(ConvertToCNFRule.java:111)
> at org.apache.impala.rewrite.ConvertToCNFRule.apply(ConvertToCNFRule.java:86)
> at org.apache.impala.rewrite.ExprRewriter.applyRuleBottomUp(ExprRewriter.java:85)
> at org.apache.impala.rewrite.ExprRewriter.applyRuleBottomUp(ExprRewriter.java:83)
> at org.apache.impala.rewrite.ExprRewriter.applyRuleRepeatedly(ExprRewriter.java:71)
> at org.apache.impala.rewrite.ExprRewriter.rewrite(ExprRewriter.java:55)
> at org.apache.impala.analysis.SelectStmt.rewriteCheckOrdinalResult(SelectStmt.java:1043)
> at org.apache.impala.analysis.SelectStmt.rewriteExprs(SelectStmt.java:1068)
> at org.apache.impala.analysis.AnalysisContext.analyze(AnalysisContext.java:472)
> at org.apache.impala.analysis.AnalysisContext.analyzeAndAuthorize(AnalysisContext.java:415)
> at org.apache.impala.service.Frontend.doCreateExecRequest(Frontend.java:1530)
> at org.apache.impala.service.Frontend.getTExecRequest(Frontend.java:1497)
> {noformat}
> Other variations of the same pattern that also encounter similar failure:
> {noformat}
> explain select case when not (l_quantity = 5) then 0 else 1 end from lineitem group by case when not (l_quantity = 5) then 0 else 1 end
> ERROR: IllegalStateException: null
> {noformat}
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