[I] File Scan emits zero rows when Offset is set and Limit is left empty [texera]

["eugenegujing (via GitHub)" <gi...@apache.org>]

eugenegujing opened a new issue, #7345:
URL: https://github.com/apache/texera/issues/7345

   ### What happened?
   
   `FileScanUtils.createTuplesFromFile` computes the end of its slice as `offset + limit.getOrElse(Int.MaxValue)`. When the user sets an Offset and leaves Limit empty, that addition overflows to a negative number and the operator emits **no rows at all**, silently and with no error, and the workflow reports success. Any Offset ≥ 1 with an empty Limit is affected. 
   
   **Expected:** Offset = 1 with an empty Limit reads from line 1 to the end of the file.
   
   Both `FileScan` and `FileScanOp` are affected, since `FileScanSourceOpExec` and `FileScanOpExec` both delegate to this helper.
   
   ### How to reproduce?
   
   1. Upload a five-line text file (`a`, `b`, `c`, `d`, `e` on separate lines) as a dataset.
   2. Add a **File Scan** operator and point its **File** property at that file.
   3. Leave Attribute Type at its default (`string`, i.e. one tuple per line).
   4. Set **Offset (lines)** to `1`. Leave **Limit (lines)** empty.
   5. Run the workflow and view the results.
   
   Observed: zero rows, with the workflow reporting success.
   Expected: four rows — `b`, `c`, `d`, `e`.
   
   ### Version/Branch
   
   1.3.0-incubating-SNAPSHOT (main)
   
   ### Commit Hash (Optional)
   
   _No response_
   
   ### What browsers are you seeing the problem on?
   
   _No response_
   
   ### Relevant log output
   
   ```shell
   
   ```


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Re: [I] File Scan emits zero rows when Offset is set and Limit is left empty [texera]

["eugenegujing (via GitHub)" <gi...@apache.org>]

eugenegujing commented on issue #7345:
URL: https://github.com/apache/texera/issues/7345#issuecomment-5213211062

   > [@eugenegujing](https://github.com/eugenegujing) Can you add a screenshot?
   
   I have included both screenshots from before and after fix in #7348.


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Re: [I] File Scan emits zero rows when Offset is set and Limit is left empty [texera]

["chenlica (via GitHub)" <gi...@apache.org>]

chenlica commented on issue #7345:
URL: https://github.com/apache/texera/issues/7345#issuecomment-5212779739

   @eugenegujing Can you add a screenshot?


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Re: [I] File Scan emits zero rows when Offset is set and Limit is left empty [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan closed issue #7345: File Scan emits zero rows when Offset is set and Limit is left empty
URL: https://github.com/apache/texera/issues/7345


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