"Merge selected features" leads to data loss and crash (in master)

[qgib]

Author Name: Giovanni Manghi (@gioman)
Original Redmine Issue: 6902
Affected QGIS version: master
Redmine category:vectors

---

Pick a vector layer,

select two features and try the "merge selected features" tool.

QGIS will ask you column by column if you want to keep the attribute of the first feature or if the one of the second feature.

If the column is of a numeric type, then a few more options are available, as sum, min, max, etc.

It seems anyway that this functions to always return a decimal number, and if the column is of type integer then the computed values is LOST (it becomes 0) when the edits are saved. This happens in QGIS 1.8.

In master is the same, but actually after merging the feature if the user try open the table of attributes QGIS will crash.

tested on Windows for now, will do also on linux.

---

• Screen_Shot_2013-05-09_at_10.25.22.png (Marco Francesco De Paolini)

---

Related issue(s): #16585 (relates)
Redmine related issue(s): 7668

---

[qgib]

Author Name: Giovanni Manghi (@gioman)

---

Oh boy... today it doesn't seems I'm able to replicate the crash, but the only the data loss. I will try to recover the original layer used in the first test.

[qgib]

Author Name: Giovanni Manghi (@gioman)

---

see also #16109

[qgib]

Author Name: Marco Francesco De Paolini (Marco Francesco De Paolini)

---

May be related: sometimes when selecting two features with identical fields values and try the "merge selected features", it appears to select different random features in the Merge feature attributes window. Not sure how to replicate this issue.

---

• 5663 was configured as Screen_Shot_2013-05-09_at_10.25.22.png

---

• Screen_Shot_2013-05-09_at_10.25.22.png (Marco Francesco De Paolini)

[qgib]

Author Name: Giovanni Manghi (@gioman)

---

The result (after saving edits) is always wrong in an integer column (it becomes 0) when using any function (median, sum, min, max). In a decimal column the decimal part is removed is using "median".

Anyway it causes data corruption.

[qgib]

Author Name: Matthias Kuhn (@m-kuhn)

---

Fixed in changeset "7d38eac04352bbfe7800782e462380f9525fe6cb".

---

• status_id was changed from Open to Closed