steFaiz commented on code in PR #7889:
URL: https://github.com/apache/paimon/pull/7889#discussion_r3273138043
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paimon-common/src/main/java/org/apache/paimon/data/Blob.java:
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@@ -38,6 +38,31 @@
@Public
public interface Blob {
+ /**
+ * The placeholder blob, mainly for blob update in data-evolution. It
should never be exposed to
+ * users.
+ */
+ Blob PLACE_HOLDER =
Review Comment:
Thanks for your advise! But in https://github.com/apache/paimon/pull/7125 we
supports storing nulls in blob file. I'm not clear how to distinguish
placeholders and native NULLs if so.
From the semantics, NULLs are exposed to users, users know that they store
some nulls. But placeholders are fully internal used, users should never be
aware about them. If users set some rows as nulls, we may fallback those rows
to earlier versions, this is not expected in our design.
Could you please give me some advise?
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