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Posted to issues@hop.apache.org by "mhamedbenjmaa (via GitHub)" <gi...@apache.org> on 2026/08/15 17:18:09 UTC
[I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
mhamedbenjmaa opened a new issue, #7977:
URL: https://github.com/apache/hop/issues/7977
### What needs to happen?
Description:
The documentation page for the [Table Compare transform](https://hop.apache.org/manual/latest/pipeline/transforms/tablecompare.html) is missing critical operational details regarding how the transform handles errors and input stream metadata.
1. Unclear Input Stream Requirements (Driven by Rows
2. Output Stream Split Not Explained
Main Output Stream: Outputs a single summary row per comparison with aggregate counts (ref_count, cmp_count, total_errors).
Error Stream (Red Hop): Outputs detailed, row-by-row records for every discrepancy, along with the WHERE clause key identifier and value differences.
here what i needed to do bases on code source to make it work , or I'm totally wrong
<img width="576" height="637" alt="Image" src="https://github.com/user-attachments/assets/c1534fa2-f7df-423b-b398-c99bb863d77c" />
### Issue Priority
Priority: 3
### Issue Component
Component: Documentation
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Re: [I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
Posted by "mhamedbenjmaa (via GitHub)" <gi...@apache.org>.
mhamedbenjmaa commented on issue #7977:
URL: https://github.com/apache/hop/issues/7977#issuecomment-5309801005
I just mean that there is no way to conclude from the actual documentation of the table compare https://hop.apache.org/manual/latest/pipeline/transforms/tablecompare.html
that you would need :
1) a datagird as input
also what are the data needed in the datagrid
2) that you need 2 outputs to see all necessary info
just saying thats not clear in the doc , maybe we can add a screen capt for user , so they see directly how to make this work
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Re: [I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
Posted by "hansva (via GitHub)" <gi...@apache.org>.
hansva commented on issue #7977:
URL: https://github.com/apache/hop/issues/7977#issuecomment-5303546376
Not sure what you mean with unclear input row requirements.
For error handling we have a page that describes how this works, this is the same for all transforms that support it https://hop.apache.org/manual/latest/pipeline/errorhandling.html
Every documentation page has an edit this page button we are very happy with contributions on those as we are biased by experience.
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Re: [I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
Posted by "mattcasters (via GitHub)" <gi...@apache.org>.
mattcasters commented on issue #7977:
URL: https://github.com/apache/hop/issues/7977#issuecomment-5328652086
Did you read https://hop.apache.org/manual/latest/pipeline/transforms/tablecompare.html? It explains what you ask for in the first paragraph with a note `You can click on the red error handling arrow to configure additional information about the differences found.`. What gives?
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Re: [I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
Posted by "mhamedbenjmaa (via GitHub)" <gi...@apache.org>.
mhamedbenjmaa closed issue #7977: [Documentation] : Table Compare transform docs lack required setup details and error handling requirement
URL: https://github.com/apache/hop/issues/7977
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Re: [I] [Documentation] : Table Compare transform docs lack required setup details and error handling requirement (hop)
Posted by "hansva (via GitHub)" <gi...@apache.org>.
hansva commented on issue #7977:
URL: https://github.com/apache/hop/issues/7977#issuecomment-5312959756
When we use the word "field" in our docs, it is an input stream field that should be fairly consistent in all our transforms and documentation. When it is user-written input, we use the word "value".
The error-handling hop is not mandatory and it's written in the documentation page you are pointing to:
> A summary of the differences is available as the normal output of the transform. To get your hands on every single error that is found, capture the error handling output (with an error hop).
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