Bug: Dynamodb sink error

[xxhZs]

Describe the bug

No response

Error message/log

unhandled error (ValidationException): Error { code: "ValidationException", message: "1 validation error detected: Value '{test_bench=[WriteRequest(putRequest=PutRequest(item={v1=com.amazonaws.dynamodb.v20120810.AttributeValue@79175931, v2=com.amazonaws.dynamodb.v20120810.AttributeValue@79175931, v3=com.amazonaws.dynamodb.v20120810.AttributeValue@8b8acbce, v4=com.amazonaws.dynamodb.v20120810.AttributeValue@8b8acbce}, workloadProfileName=null), deleteRequest=null), 
。。。。。
WriteRequest(putRequest=PutRequest(item={v1=com.amazonaws.dynamodb.v20120810.AttributeValue@23057457, v2=com.amazonaws.dynamodb.v20120810.AttributeValue@39c93d37, v3=com.amazonaws.dynamodb.v20120810.AttributeValue@f1effaa0, v4=com.amazonaws.dynamodb.v20120810.AttributeValue@f1effaa0}, workloadProfileName=null), deleteRequest=null), WriteRequest(putRequest=PutRequest(item={v1=com.amazonaws.dynamodb.v20120810.AttributeValue@e974423b, v2=com.amazonaws.dynamodb.v20120810.AttributeValue@5d252874, v3=com.amazonaws.dynamodb.v20120810.AttributeValue@f2860a82, v4=com.amazonaws.dynamodb.v20120810.AttributeValue@f2860a82}, workloadProfileName=null), deleteRequest=null)]}' at 'requestItems' failed to satisfy constraint: Map value must satisfy constraint: [Member must have length less than or equal to 25, Member must have length greater than or equal to 1]",

To Reproduce

CREATE table user_behaviors (
    v1 int,
v2 bigint, v3 varchar, v4 varchar
) WITH (
    connector = 'datagen',
    fields.user_id.kind = 'sequence',
    fields.user_id.start = '1',
    fields.user_id.end = '1000000',
    datagen.rows.per.second = '10000'
) FORMAT PLAIN ENCODE JSON; 

create sink s1 from user_behaviors with(connector='dynamodb',
  type='append-only',
  force_append_only='true',
  aws.region='ap-southeast-2',
  dynamodb.table='test_bench',
  aws.credentials.access_key_id='xxxx',
  aws.credentials.secret_access_key='xxxx',
  primary_key='v1');

Expected behavior

No response

How did you deploy RisingWave?

No response

The version of RisingWave

No response

Additional context

No response

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