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FIX: improve missing ConcatFeatures error message#1428

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AmirhosseinHonardoust wants to merge 3 commits into
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AmirhosseinHonardoust:fix-missing-concatfeatures-message
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FIX: improve missing ConcatFeatures error message#1428
AmirhosseinHonardoust wants to merge 3 commits into
IBM:masterfrom
AmirhosseinHonardoust:fix-missing-concatfeatures-message

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@AmirhosseinHonardoust AmirhosseinHonardoust commented May 25, 2026

Fixes #663.

This PR improves the schema validation error message for pipelines where the output of the & combinator is passed directly into an estimator.

When the actual input schema appears to contain multiple parallel outputs, the error message now suggests using ConcatFeatures.

It also adds a regression test for this case.

Tested locally with:

python -m pytest test\test_core_pipeline.py -k missing_concat_features_error_message

Result: 1 passed, 79 deselected.

Signed-off-by: Amir <88084572+AmirhosseinHonardoust@users.noreply.github.com>
Signed-off-by: Amir <88084572+AmirhosseinHonardoust@users.noreply.github.com>
Signed-off-by: Amir <88084572+AmirhosseinHonardoust@users.noreply.github.com>
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Improve error message for missing ConcatFeatures

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