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Add a "cancel" button for Query Builder get "Sample" Values #22592
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Author Name: Giovanni Manghi (@gioman) Please link/attach a dataset that can be used to replicate the issue.
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Author Name: Saber Razmjooei (@saberraz) QGIS does some work in the background to generate the sample. To have it in a separate thread with option to cancel the operation is more of a feature request than a bug. |
Author Name: Giovanni Manghi (@gioman)
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Author Name: Jürgen Fischer (@jef-n)
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Author Name: Jürgen Fischer (@jef-n)
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Author Name: Giovanni Manghi (@gioman)
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I would suggest extending the proposed functionality by adding the ability to cancel the execution of any request in the Query Builder. For example, by pressing the |
I agree this would be a nice feature. |
Author Name: Nikos Tsarmpopoulos (@ntsarb)
Original Redmine Issue: 14627
Redmine category:vectors
Hi,
When hitting the "Sample" button, Query Builder freezes. I presume this is because there's a large database associated with the layer. However, this should not happen. Either the function should quickly return a small resultset, or it should run in a separate thread and the user interface should provide a button to interrupt it and return a small sample.
To reproduce, open a layer with a sufficiently large set, e.g. polygons and data for UK postcodes, open the Query builder and click on "Sample" button.
This has been found on QGIS 2.14.1 64bit, running on Windows 7 Pro 64bit.
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