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https://issues.apache.org/jira/browse/SPARK-12982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123406#comment-15123406
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Apache Spark commented on SPARK-12982:
--------------------------------------

User 'jayadevanmurali' has created a pull request for this issue:
https://github.com/apache/spark/pull/10983

> SQLContext: temporary table registration does not accept valid identifier
> -------------------------------------------------------------------------
>
>                 Key: SPARK-12982
>                 URL: https://issues.apache.org/jira/browse/SPARK-12982
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.6.0
>            Reporter: Grzegorz Chilkiewicz
>            Priority: Minor
>              Labels: sql
>
> We have encountered very strange behavior of SparkSQL temporary table 
> registration.
> What identifiers for temporary table should be valid?
> Alphanumerical + '_' with at least one non-digit?
> Valid identifiers:
> df
> 674123a
> 674123_
> a0e97c59_4445_479d_a7ef_d770e3874123
> 1ae97c59_4445_479d_a7ef_d770e3874123
> Invalid identifier:
> 10e97c59_4445_479d_a7ef_d770e3874123
> Stack trace:
> {code:xml}
> java.lang.RuntimeException: [1.1] failure: identifier expected
> 10e97c59_4445_479d_a7ef_d770e3874123
> ^
>       at scala.sys.package$.error(package.scala:27)
>       at 
> org.apache.spark.sql.catalyst.SqlParser$.parseTableIdentifier(SqlParser.scala:58)
>       at org.apache.spark.sql.SQLContext.table(SQLContext.scala:827)
>       at org.apache.spark.sql.SQLContext.dropTempTable(SQLContext.scala:763)
>       at 
> SparkSqlContextTempTableIdentifier$.identifierCheck(SparkSqlContextTempTableIdentifier.scala:9)
>       at 
> SparkSqlContextTempTableIdentifier$.main(SparkSqlContextTempTableIdentifier.scala:42)
>       at 
> SparkSqlContextTempTableIdentifier.main(SparkSqlContextTempTableIdentifier.scala)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at sbt.Run.invokeMain(Run.scala:67)
>       at sbt.Run.run0(Run.scala:61)
>       at sbt.Run.sbt$Run$$execute$1(Run.scala:51)
>       at sbt.Run$$anonfun$run$1.apply$mcV$sp(Run.scala:55)
>       at sbt.Run$$anonfun$run$1.apply(Run.scala:55)
>       at sbt.Run$$anonfun$run$1.apply(Run.scala:55)
>       at sbt.Logger$$anon$4.apply(Logger.scala:85)
>       at sbt.TrapExit$App.run(TrapExit.scala:248)
>       at java.lang.Thread.run(Thread.java:745)
> {code}
> Code to reproduce this bug:
> https://github.com/grzegorz-chilkiewicz/SparkSqlContextTempTableIdentifier



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