dzikosc commented on code in PR #152:
URL: 
https://github.com/apache/flink-connector-aws/pull/152#discussion_r1757386924


##########
flink-connector-aws/flink-connector-dynamodb/src/main/java/org/apache/flink/connector/dynamodb/table/DynamoDbDynamicSinkFactory.java:
##########
@@ -58,6 +58,17 @@ public DynamicTableSink createDynamicTableSink(Context 
context) {
                         .setDynamoDbClientProperties(
                                 
dynamoDbConfiguration.getSinkClientProperties());
 
+        if (catalogTable.getResolvedSchema().getPrimaryKey().isPresent()) {

Review Comment:
   IN case of DynamoDB contents of PrimaryKey and Partition Key should be the 
same to ensure semantic correctness of various operations. 
   
   To simplify the usage, we should aim to use just PrimaryKey property, as 
it's a fairly intuitive and well understood concept for DDB users. In the 
meantime, we should probably aim to start deprecation process of the `partition 
by` mechanism. 
   
   The first step could be 
   - if PK is set, but `partition by` is not, use PK as `partition by` 
   - document that `partition by` is on deprecation path
   - log warnings when `partition by` is being used



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