auroflow commented on code in PR #29210:
URL: https://github.com/apache/flink/pull/29210#discussion_r4043947251
##########
flink-python/src/main/java/org/apache/flink/table/runtime/arrow/writers/MapWriter.java:
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@@ -84,6 +84,13 @@ public void doWrite(T in, int ordinal) {
}
}
+ @Override
+ public void reset() {
Review Comment:
Yes, this fixes an existing bug affecting pandas UDFs too. Between Arrow
batches, the map vector resets, but its key/value writers retain their
counters. Subsequent batches then write children at incorrect positions.
I have taken this fix out of this PR and created
[LINK-40705](https://issues.apache.org/jira/browse/FLINK-40705) to address this
separately.
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