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https://issues.apache.org/jira/browse/FLINK-40958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18133010#comment-18133010
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Martijn Visser commented on FLINK-40958:
----------------------------------------
Two more on the master nightlies, both GHA core:
https://github.com/apache/flink/actions/runs/40153025657/job/121051725367
(2026-10-25, Java 11)
https://github.com/apache/flink/actions/runs/40257526861/job/121364786974
(2026-10-26, Hadoop 3.4.3, JDK 17)
{code}
[ERROR]
org.apache.flink.types.variant.JsonVariantFormatterTest.testDeeplyNestedValueRenders
-- Time elapsed: 0.489 s <<< ERROR!
java.lang.StackOverflowError
at
org.apache.flink.types.variant.BinaryVariantInternalBuilder.shallowAppendVariantImpl(BinaryVariantInternalBuilder.java:675)
at
org.apache.flink.types.variant.BinaryVariantInternalBuilder.appendVariantImpl(BinaryVariantInternalBuilder.java:669)
{code}
release-2.4 has the test too, so the fix needs to go there as well for 2.4.0.
> VARIANT might fail with StackOverflow
> -------------------------------------
>
> Key: FLINK-40958
> URL: https://issues.apache.org/jira/browse/FLINK-40958
> Project: Flink
> Issue Type: Improvement
> Components: API / Core
> Affects Versions: 2.4.0
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> for instance for deep {{VARIANT}}s
> {noformat}
> RowDataToJsonConvertersTest.testVariantNestedBeyondJsonParserLimitAtCutEdgeIsIllegalUserInput:225
> 02:50
> Expecting actual throwable to be an instance of:02:50
> org.apache.flink.util.IllegalUserInputRuntimeException02:50
> but was:02:50
> java.lang.StackOverflowError02:50
> at
> org.apache.flink.types.variant.JsonVariantFormatter.lambda$appendNode$1(JsonVariantFormatter.java:118)02:50
> at
> org.apache.flink.types.variant.BinaryVariantUtil.handleArray(BinaryVariantUtil.java:843)02:50
> at
> org.apache.flink.types.variant.JsonVariantFormatter.appendNode(JsonVariantFormatter.java:114)02:50
> ...(1021 remaining lines not displayed - this can be changed with
> Assertions.setMaxStackTraceElementsDisplayed)
> {noformat}
> probably better to use loop
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