[GitHub] [iceberg] Reo-LEI commented on a change in pull request #2863: Flink: Add streaming upsert write option.

[GitBox <gi...@apache.org>]

Reo-LEI commented on a change in pull request #2863:
URL: https://github.com/apache/iceberg/pull/2863#discussion_r704949371



##########
File path: flink/src/main/java/org/apache/iceberg/flink/sink/FlinkSink.java
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@@ -321,7 +339,27 @@ private String operatorName(String suffix) {
           equalityFieldIds.add(field.fieldId());
         }
       }
-      IcebergStreamWriter<RowData> streamWriter = createStreamWriter(table, flinkRowType, equalityFieldIds);
+
+      // Fallback to use upsert mode parsed from table properties if don't specify in job level.
+      boolean upsertMode = upsert || PropertyUtil.propertyAsBoolean(table.properties(),
+          UPSERT_MODE_ENABLE, UPSERT_MODE_ENABLE_DEFAULT);
+
+      // Validate the equality fields and partition fields if we enable the upsert mode.
+      if (upsertMode) {
+        Preconditions.checkState(!overwrite,
+            "OVERWRITE mode shouldn't be enable when configuring to use UPSERT data stream.");

Review comment:
       I have added a unittest to covery this, thanks for your reminder！:) @kbendick 




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