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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-2974) SELECT COUNT(DISTINCT c1, c2,...) throws NPE
Date Wed, 08 Jun 2016 17:57:21 GMT
Lars Hofhansl created PHOENIX-2974:
--------------------------------------

             Summary: SELECT COUNT(DISTINCT c1, c2,...) throws NPE
                 Key: PHOENIX-2974
                 URL: https://issues.apache.org/jira/browse/PHOENIX-2974
             Project: Phoenix
          Issue Type: Bug
            Reporter: Lars Hofhansl
            Priority: Minor


See discussion on PHOENIX-2965.

Phoenix throws an NPE for a query like this: {{SELECT COUNT(DISINCT p1, p2) FROM table}}
{code}
java.lang.NullPointerException
	at org.apache.phoenix.parse.FunctionParseNode.validate(FunctionParseNode.java:136)
	at org.apache.phoenix.compile.ExpressionCompiler.visitLeave(ExpressionCompiler.java:325)
	at org.apache.phoenix.compile.ProjectionCompiler$SelectClauseVisitor.visitLeave(ProjectionCompiler.java:680)
	at org.apache.phoenix.compile.ProjectionCompiler$SelectClauseVisitor.visitLeave(ProjectionCompiler.java:576)
	at org.apache.phoenix.parse.FunctionParseNode.accept(FunctionParseNode.java:86)
	at org.apache.phoenix.compile.ProjectionCompiler.compile(ProjectionCompiler.java:408)
	at org.apache.phoenix.compile.QueryCompiler.compileSingleFlatQuery(QueryCompiler.java:564)
	at org.apache.phoenix.compile.QueryCompiler.compileSingleQuery(QueryCompiler.java:510)
	at org.apache.phoenix.compile.QueryCompiler.compileSelect(QueryCompiler.java:205)
	at org.apache.phoenix.compile.QueryCompiler.compile(QueryCompiler.java:157)
{code}

While not it's not standard and many DBs do not support this, I think we can discuss supporting
this, or at the very least not throw an NPE.



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