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https://issues.apache.org/jira/browse/CALCITE-5699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723283#comment-17723283
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Julian Hyde commented on CALCITE-5699:
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Your fix, using null policy, looks good. Can you merge the several queries in
{{select.iq}} into one. Also add a test similar to
{{SqlOperatorTest.testLikeOperator}}; it only needs to be about 6 lines long.
> Posix regex expressions failed while NOT operator is executed with null
> literals.
> ---------------------------------------------------------------------------------
>
> Key: CALCITE-5699
> URL: https://issues.apache.org/jira/browse/CALCITE-5699
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: Evgeny Stanilovsky
> Assignee: Evgeny Stanilovsky
> Priority: Major
> Labels: pull-request-available
>
> Operations like :
> {noformat}
> SELECT null !~ 'ab[cd]'
> SELECT 'abcd' !~ null
> SELECT null !~ null
> SELECT null !~* 'ab[cd]'
> SELECT 'abcd' !~* null
> SELECT null !~* null{noformat}
> is not possible for now, NPE is raised :
> {noformat}
> Caused by: java.lang.NullPointerException
> at java.base/java.util.regex.Matcher.getTextLength(Matcher.java:1770)
> at java.base/java.util.regex.Matcher.reset(Matcher.java:416)
> at java.base/java.util.regex.Matcher.<init>(Matcher.java:253)
> at java.base/java.util.regex.Pattern.matcher(Pattern.java:1134)
> at
> org.apache.calcite.runtime.SqlFunctions.posixRegex(SqlFunctions.java:864){noformat}
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