mxm commented on code in PR #12049:
URL: https://github.com/apache/iceberg/pull/12049#discussion_r1937936596
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flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/data/FlinkParquetWriters.java:
##########
@@ -498,6 +498,12 @@ private static class RowDataWriter extends
ParquetValueWriters.StructWriter<RowD
@Override
protected Object get(RowData struct, int index) {
+ // Be sure to check for null values, even if the field is required.
Without an explicit null
+ // check, BinaryRowData will ignore the null flag and parse random bytes
as actual values.
+ // This will produce incorrect writes instead of failing with a
NullPointerException.
+ if (struct.isNullAt(index)) {
+ return null;
+ }
Review Comment:
You are right. I revised the approach because it was too easy to miss
instances. I'm instead wrapping RowData#createFieldGetter to make sure to
null-check also for required / NonNull types. I'll raise an issue on the Flink
side as well.
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