[jira] Commented: (DERBY-4407) StringIndexOutOfBoundsException in ij when result has no columns

["Rick Hillegas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-4407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765063#action_12765063 ] 

Rick Hillegas commented on DERBY-4407:
--------------------------------------

Hi Knut,

I think that a row returned by a query must have at least column. Here's how I thread my way to this conclusion by reading part 2 of the SQL Standard:

1) The result set returned by a query expression is a kind of table called a "derived table" according to 4.14.2 "Types of tables".

2) A row in a table must have at least one column according to the previous section, 4.14.1 "Introduction to tables"


> StringIndexOutOfBoundsException in ij when result has no columns
> ----------------------------------------------------------------
>
>                 Key: DERBY-4407
>                 URL: https://issues.apache.org/jira/browse/DERBY-4407
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions: 10.6.0.0
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>
> A query that returns no columns should perhaps raise an SQLException of some kind, I don't know, but currently it doesn't, and ij fails with a StringIndexOutOfBoundsException when it tries to display the result.
> After DERBY-4370 it is possible to construct queries that return no columns by having a select list like T1.* in a join where the USING clause contains all of T1's columns. To reproduce:
> ij> create table t(x int);
> 0 rows inserted/updated/deleted
> ij> insert into t values (1),(2),(3);
> 3 rows inserted/updated/deleted
> ij> select t1.* from t t1 join t t2 using (x);
> JAVA ERROR: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
> java.lang.StringIndexOutOfBoundsException: String index out of range: -1
> 	at java.lang.AbstractStringBuilder.setLength(AbstractStringBuilder.java:143)
> 	at java.lang.StringBuffer.setLength(StringBuffer.java:153)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayBanner(JDBCDisplayUtil.java:627)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:368)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:338)
> 	at org.apache.derby.tools.JDBCDisplayUtil.indent_DisplayResults(JDBCDisplayUtil.java:241)
> 	at org.apache.derby.tools.JDBCDisplayUtil.DisplayResults(JDBCDisplayUtil.java:229)
> 	at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:448)
> 	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:522)
> 	at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:363)
> 	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:261)
> 	at org.apache.derby.impl.tools.ij.Main.go(Main.java:229)
> 	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:184)
> 	at org.apache.derby.impl.tools.ij.Main.main(Main.java:75)
> 	at org.apache.derby.tools.ij.main(ij.java:59)
> 	at org.apache.derby.iapi.tools.run.main(run.java:53)

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