@parent not linked to the correct feature when looping through layer

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 15771
Affected QGIS version: master
Redmine category:expressions
Assignee: Matthias Kuhn

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While testing out the cool new @parent variable for the aggregate() function, I noticed the @parent variable doesn't get assigned to the correct feature when looping through a layer (as part of labelling or symbology rendering). I've attached a small test project which demonstrate the issue.

Steps to reproduce

1. Open the parent.qgs test project
2. Take note of the label over the two orange areas
3. It should be showing the number of overlapping points, which it does properly only for the first feature (i.e. 3), while the second feature also shows 3 when it should show 2.
4. The labels' second line show the @parent COMM_CODE value, which shows the wrong one for the second feature (it should be 123456, and instead it prints 12345)

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• parent.zip (Mathieu Pellerin - nIRV)
• parent_v2.zip (Mathieu Pellerin - nIRV)

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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This commit (#7a05a7a8c4b9184f6cad7d155b6714076b1dccd9) improved things (i.e. @parent's caching works, so is $geometry's), but caching is still not updated for "fields" in the filter clause.

I'm attaching an updated test project, which labels two polygons using three aggregate calls, the third one being built on a "field" = attribute(@parent,"parent_field) which fails for the 2nd polygon. The failure is due to "field" not being updated with the 2nd polygon's values.

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• done_ratio was changed from 0 to 50
• 10505 was configured as parent_v2.zip

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• parent_v2.zip (Mathieu Pellerin - nIRV)

[qgib]

Author Name: Anónimo (Anónimo)

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Fixed in changeset "e7333f68145f27a74aacd8f75939623e37fc4510".

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• status_id was changed from Open to Closed