Rules and guidelines for Amazon DynamoDB V2 mappings

• •The source tables must not be empty. Otherwise, the mapping fails.
• •All rows in the source table must have the same schema. Otherwise, the schema inference might produce incorrect results.
• •At runtime, all the rows in the source table must match the schema that was inferred when the mapping was created. Otherwise, the mapping run might produce incorrect results.
• •A table that contains columns with null values might treat the columns as string types when the mapping runs.
• •If the source contains binary data, the Data Preview section shows jumbled text.
• •When you enable data preview for mappings that use an existing Amazon DynamoDB target, the data preview fails.
• •You cannot use complex data type columns as lookup conditions.