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ListStreams: an ExclusiveStartStreamArn that is not a stream ARN answers "Invalid stream ARN format", where DynamoDB answers Invalid StreamArn or a length fault #906
Description
What ExtendDB does
parse_stream_arn in crates/storage/src/util/arn.rs refuses a start ARN it cannot read with Invalid stream ARN format: <value>. ListStreams gives that sentence for a table ARN and for a value of fewer than 37 characters.
Measured at 9234b54 of #830 on 2026-11-07, SQLite and PostgreSQL, on the caller's account:
ExclusiveStartStreamArn |
ExtendDB |
|---|---|
arn:aws:dynamodb:us-east-1:123456789012:table/pq830-probe |
ValidationException: Invalid stream ARN format: arn:aws:dynamodb:us-east-1:123456789012:table/pq830-probe |
| the same table ARN with U+0000 in the table segment | Invalid stream ARN format: <value> |
xyz |
Invalid stream ARN format: xyz |
x<U+0000>y |
Invalid stream ARN format: x<U+0000>y |
What DynamoDB does
Measured in us-east-1 on 2026-11-06, with SDK parameter validation off:
ExclusiveStartStreamArn |
DynamoDB |
|---|---|
| a table ARN of the caller's account, with or without U+0000 in the table segment | ValidationException: Invalid StreamArn |
xyz and x<U+0000>y |
ValidationException: 1 validation error detected: Value at 'exclusiveStartStreamArn' failed to satisfy constraint: Member must have length greater than or equal to 37 |
Suggested fix
Answer Invalid StreamArn for a start ARN that is not a stream ARN, and check the minimum length of 37 characters before the shape. The maximum length, and the order of these checks against Limit, were not measured.
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