From the error message, your filter expression seems to be more than 4KB, which is the maximum allowed.
It is mentioned in the documentation - https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ServiceQuotas.html under the Expression Parameters section - "The maximum length of any expression string is 4 KB. For example, the size of the ConditionExpression a=b is 3 bytes."
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