[flink] Batch query on empty datalake-enabled table should return 0 rows instead of failing with UnsupportedOperationException

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Fluss version

main (development)

Please describe the bug 🐞

When a Fluss table has table.datalake.enabled = true but is empty (no data written yet, so no lake snapshot has been tiered), running a batch query via Flink SQL fails with:

 java.lang.UnsupportedOperationException: Currently, Batch mode can only be supported if one lake snapshot exists for the table.

Solution

The expected behavior is to return an empty result set (0 rows). The Spark connector already handles this correctly by falling back gracefully.

Are you willing to submit a PR?

• I'm willing to submit a PR!

[matrixsparse]

Hi, I'd like to work on this issue. Please assign it to me, thanks!

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assigned to @matrixsparse