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https://issues.apache.org/jira/browse/SPARK-48284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18051451#comment-18051451
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Yang Jie commented on SPARK-48284:
----------------------------------
What is the basis for determining the correct behavior described? I executed
the provided example in Java 17 jshell, and it seems that the returned value is
different from what's described.
{code:java}
jshell> "abc".indexOf("", 0);
$1 ==> 0
jshell> "abc".indexOf("", 2);
$2 ==> 2
jshell> "abc".indexOf("", 9);
$3 ==> 3
jshell> "abc".indexOf("", -3);
$4 ==> 0 {code}
> Fix UTF8String indexOf behaviour for empty string search
> --------------------------------------------------------
>
> Key: SPARK-48284
> URL: https://issues.apache.org/jira/browse/SPARK-48284
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Priority: Major
> Labels: pull-request-available
>
> Currently, UTF8String.indexOf returns 0 when given an empty parameters
> string, and any integer start value.
> Examples:
> {{"abc".indexOf("", 0); // returns: 0}}
> {{"abc".indexOf("", 2); // returns: 0}}
> {{"abc".indexOf("", 9); // returns: 0}}
> {{"abc".indexOf("", -3); // returns: 0}}
> This is not correct, as "start" is not taken into consideration.
> Correct behaviour would be:
> {{"abc".indexOf("", 0); // returns: 0}}
> {{"abc".indexOf("", 2); // returns: 2}}
> {{"abc".indexOf("", 9); // returns: -1}}
> {{"abc".indexOf("", -3); // returns: -1}}
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