godfreyhe opened a new pull request #12752:
URL: https://github.com/apache/flink/pull/12752
## What is the purpose of the change
*In current implementation of PrintUtils, all result will be collected to
local memory to compute column width first. this can works fine with batch
query and bounded stream query. but for unbounded stream query, the result will
be endless, so the result will be never printed. To solve this, we can use
fix-length strategy, and print a row immediately once the row is accessed. This
pr aims to fix the bug.*
## Brief change log
- *[hotfix] correct the logic of `truncateString` method in PrintUtils*
- *Correct the logic of PrintUtils for unbounded stream query case*
## Verifying this change
This change added tests and can be verified as follows:
- *Extended PrintUtilsTest and CliTableauResultViewTest to verify the
fixes*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ **not documented**)
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