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https://issues.apache.org/jira/browse/IMPALA-9641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-9641:
----------------------------------
Priority: Blocker (was: Major)
> Query hang when containing alias names as empty backticks
> ---------------------------------------------------------
>
> Key: IMPALA-9641
> URL: https://issues.apache.org/jira/browse/IMPALA-9641
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Quanlong Huang
> Priority: Blocker
>
> The following query will hang in an infinite loop:
> {code:java}
> select 1 as "``";
> {code}
> Stacktrace of its compiler thread:
> {code:java}
> "Thread-19" #34 prio=5 os_prio=0 tid=0x0000000012fc0000 nid=0x5514 runnable
> [0x00007f2abda41000]
> java.lang.Thread.State: RUNNABLE
> at java.io.FileOutputStream.writeBytes(Native Method)
> at java.io.FileOutputStream.write(FileOutputStream.java:326)
> at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
> - locked <0x00000005cc90f7b8> (a java.io.BufferedOutputStream)
> at java.io.PrintStream.write(PrintStream.java:482)
> - locked <0x00000005cc90f798> (a java.io.PrintStream)
> at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
> at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)
> at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)
> - locked <0x00000005cc90f8d8> (a java.io.OutputStreamWriter)
> at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)
> at java.io.PrintStream.write(PrintStream.java:527)
> - locked <0x00000005cc90f798> (a java.io.PrintStream)
> at java.io.PrintStream.print(PrintStream.java:669)
> at java.io.PrintStream.println(PrintStream.java:806)
> - locked <0x00000005cc90f798> (a java.io.PrintStream)
> at
> org.antlr.runtime.BaseRecognizer.emitErrorMessage(BaseRecognizer.java:344)
> at
> org.antlr.runtime.BaseRecognizer.displayRecognitionError(BaseRecognizer.java:194)
> at org.antlr.runtime.Lexer.reportError(Lexer.java:261)
> at org.antlr.runtime.Lexer.nextToken(Lexer.java:103)
> at
> org.apache.impala.analysis.ToSqlUtils.hiveNeedsQuotes(ToSqlUtils.java:145)
> at
> org.apache.impala.analysis.ToSqlUtils.getIdentSql(ToSqlUtils.java:199)
> at org.apache.impala.analysis.SlotRef.<init>(SlotRef.java:58)
> at
> org.apache.impala.analysis.SelectStmt$SelectAnalyzer.analyzeSelectClause(SelectStmt.java:283)
> at
> org.apache.impala.analysis.SelectStmt$SelectAnalyzer.analyze(SelectStmt.java:215)
> at
> org.apache.impala.analysis.SelectStmt$SelectAnalyzer.access$100(SelectStmt.java:199)
> at org.apache.impala.analysis.SelectStmt.analyze(SelectStmt.java:192)
> at
> org.apache.impala.analysis.AnalysisContext.analyze(AnalysisContext.java:473)
> at
> org.apache.impala.analysis.AnalysisContext.analyzeAndAuthorize(AnalysisContext.java:437)
> at
> org.apache.impala.service.Frontend.doCreateExecRequest(Frontend.java:1530)
> at
> org.apache.impala.service.Frontend.getTExecRequest(Frontend.java:1497)
> at
> org.apache.impala.service.Frontend.createExecRequest(Frontend.java:1467)
> at
> org.apache.impala.service.JniFrontend.createExecRequest(JniFrontend.java:154)
> {code}
> org.antlr.runtime.Lexer keeps emitting the same error message to stderr
> (which is redirected to impalad.ERROR):
> {code:java}
> line 1:0 rule Identifier failed predicate: {allowQuotedId()}?
> line 1:0 rule Identifier failed predicate: {allowQuotedId()}?
> line 1:0 rule Identifier failed predicate: {allowQuotedId()}?
> {code}
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