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Posted to notifications@texera.apache.org by "kz930 (via GitHub)" <gi...@apache.org> on 2026/09/28 20:39:30 UTC
[I] Should a table with no rows keep its declared schema? [texera]
kz930 opened a new issue, #8735:
URL: https://github.com/apache/texera/issues/8735
### Feature Summary
When a port finishes with no rows, a Python table operator gets a DataFrame with no columns. Any operator that names a column then fails, so a Sort after a Filter that matched nothing fails the whole run. #8487 has the reproduction.
#8487 was closed so it would not hold up unrelated work, and the question itself was left open. One view is that a table with no rows carries no schema by design. Another is that a table with no data can still be a real table, like a filter that matched nothing or a file with only a header, and its schema is information worth saving. This choice decides what every table operator sees on an empty input, so I'd like to hear from others before writing any code.
### Proposed Solution or Design
Three options, none picked yet:
1. Keep today's behavior. A port with no rows reaches the operator with no columns, and an operator that names a column fails.
2. The engine skips `process_table` for a port with no rows and finishes it quietly.
3. The operator gets the port's declared columns with no rows under them. #8488 did this and was closed.
### Affected Area
Workflow Engine (Amber)
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Re: [I] Should a table with no rows keep its declared schema? [texera]
Posted by "chenlica (via GitHub)" <gi...@apache.org>.
chenlica commented on issue #8735:
URL: https://github.com/apache/texera/issues/8735#issuecomment-5882226779
I also support design 3. In addition, I hope the frontend can show a table without any records.
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Re: [I] Should a table with no rows keep its declared schema? [texera]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #8735:
URL: https://github.com/apache/texera/issues/8735#issuecomment-5878093897
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Re: [I] Should a table with no rows keep its declared schema? [texera]
Posted by "aglinxinyuan (via GitHub)" <gi...@apache.org>.
aglinxinyuan closed issue #8735: Should a table with no rows keep its declared schema?
URL: https://github.com/apache/texera/issues/8735
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Re: [I] Should a table with no rows keep its declared schema? [texera]
Posted by "aicam (via GitHub)" <gi...@apache.org>.
aicam commented on issue #8735:
URL: https://github.com/apache/texera/issues/8735#issuecomment-5879452205
I agree with 3. The schema is used to compile workflow. Many features of the system rely on the schema, therefore I agree that schema should be preserved in any case including empty.
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