Unexpected error in the attribute table with the QGIS Union algorithm

[qgib]

Author Name: Samuel Fernando Mesa Giraldo (Samuel Fernando Mesa Giraldo)
Original Redmine Issue: 19067
Affected QGIS version: 3.0.3
Redmine category:processing/qgis

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Performing an academic vector overlay exercise, I found a possible error in the result of the attribute table using the Union function with the two polygons layers of a GeoPackage database.

Here are the original layers:

The result of A U B gives the following:

Geometries with intersection should not deliver null values.

Attached is a QGIS project to replicate the results.

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• test_overlay_union.zip (Samuel Fernando Mesa Giraldo)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Confirmed fixed in 3.2

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed