[IMPALA-7419] NullPointerException in SimplifyConditionalsRule

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 3.1.0
• Fix Version/s: Impala 3.1.0
• Component/s: Frontend
• Epic Color: ghx-label-1
• Assignee: Thomas Tauber-Marshall
• Reporter: Thomas Tauber-Marshall
• Created: 09/Aug/18 20:40
• Updated: 14/Aug/18 01:33
• Resolved: 14/Aug/18 01:33

Description

Found by the query generator:

SELECT
COALESCE((-311) * (NULL), MIN(DISTINCT tinyint_col), 42)
FROM functional.alltypes

java.lang.NullPointerException 
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187) 
        at org.apache.impala.analysis.FunctionCallExpr.isAggregateFunction(FunctionCallExpr.java:238) 
        at org.apache.impala.analysis.Expr$1.apply(Expr.java:100) 
        at org.apache.impala.analysis.Expr$1.apply(Expr.java:97) 
        at org.apache.impala.common.TreeNode.contains(TreeNode.java:162) 
        at org.apache.impala.rewrite.SimplifyConditionalsRule.apply(SimplifyConditionalsRule.java:84) 
        at org.apache.impala.rewrite.ExprRewriter.applyRuleBottomUp(ExprRewriter.java:85) 
        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.SelectList.rewriteExprs(SelectList.java:97) 
        at org.apache.impala.analysis.SelectStmt.rewriteExprs(SelectStmt.java:892) 
        at org.apache.impala.analysis.AnalysisContext.analyze(AnalysisContext.java:446) 
        at org.apache.impala.analysis.AnalysisContext.analyzeAndAuthorize(AnalysisContext.java:408) 
        at org.apache.impala.service.Frontend.createExecRequest(Frontend.java:1035) 
        at org.apache.impala.service.JniFrontend.createExecRequest(JniFrontend.java:165) 

Issue Links

• is caused by: IMPALA-5016 Missed opportunities for static partition pruning with COALESCE()