CodingCat commented on PR #4795:
URL: https://github.com/apache/iceberg/pull/4795#issuecomment-1135168675
> Actually, I think there's an existing way that the thread ID could be
exposed in the snapshot summary. Look into the
`SnapshotSummary.EXTRA_METADATA_PREFIX`. Basically, in the spark `options` used
on write, you'd add `snapshot-property.${desired_summary_key}` =
`${desired_value_for_key}`. And then on write, in the snapshot summary,
`desired_summary_key = desired_value_for_key` will be written.
>
> See here where the options are added:
>
>
https://github.com/apache/iceberg/blob/feeb94b255b705382282e04fbeb1efdc3210d6cc/spark/v3.2/spark/src/main/java/org/apache/iceberg/spark/SparkWriteConf.java#L168-L175
>
> And here where the key is defined:
>
>
https://github.com/apache/iceberg/blob/feeb94b255b705382282e04fbeb1efdc3210d6cc/core/src/main/java/org/apache/iceberg/SnapshotSummary.java#L60
well, the reason I didn't go into this obviously easier path is that we
there is no way for me to add this snapshot tag when we do DELETE and UPSERT
(or I didn't find it?)
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