[jira] [Commented] (LUCENE-6245) ConstantScoreQuery etc have crazy toString()'s

["Adrien Grand (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-6245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14321492#comment-14321492 ] 

Adrien Grand commented on LUCENE-6245:
--------------------------------------

OK I see the issue. I wanted to keep Filter as backward-compatible as possible but I had not anticipated the bad effects on toString(). Your proposal sounds good to me, I'll work on a fix unless you already started.

> ConstantScoreQuery etc have crazy toString()'s
> ----------------------------------------------
>
>                 Key: LUCENE-6245
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6245
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>
> For backwards compatibility reasons, LUCENE-1518 gave Filter a default "crap" toString(String) impl of getClass().getSimpleName(). I don't think we should do this. It causes problems e.g. when filters are wrapped in ConstantScoreQuery or other places, because toString(String) does the wrong thing.
> {code}
> Filter f = new MultiTermQueryWrapperFilter<WildcardQuery>(new WildcardQuery(new Term("foo", "b*ar")));
>     
> System.out.println(f.toString()); // foo:b*ar
> System.out.println(f.toString("foo")); // MultiTermQueryWrapperFilter
> {code}
> Instead i think that impl should be removed (leaving it abstract), and Query.toString() should be final for a hard break:
> {code}
>   /** Prints a query to a string, with <code>field</code> assumed to be the 
>    * default field and omitted.
>    */
>   public abstract String toString(String field);
>   /** Prints a query to a string. */
>   @Override
>   public ****final**** String toString() {
>     return toString("");
>   }
> {code}
> having buggy toString's is worse than requiring a change in custom filters. It impacts all users rather than just expert ones. Also by doing this, all the current toString bugs in the codebase show up as compile errors.



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