Duplicate values for line gradient expression

[cafesilencio]

An incident was reported in which the line gradient used for the traffic line had two duplicate values which caused a crash in the app since the values have to be in ascending order. It's not clear where the duplicate values originated from. There could be a loss of precision somewhere. The values used are large decimal numbers. Or the issue could have some other cause. As of this writing this is known to have occurred only once.

Further references:
#4079
https://github.com/mapbox/mapbox-gl-native-internal/issues/1464

Below is the stack trace we got from the customer. We don't have the input that generated the expression and the customer cannot reproduce the error. Looking at the stack trace the value 0.9779811144679625 is repeated twice.

03-01 17:17:32.563 9369 9369 E AndroidRuntime: java.lang.RuntimeException: Set layer property "line-gradient" failed:
03-01 17:17:32.563 9369 9369 E AndroidRuntime: [743]: Input/output pairs for "step" expressions must be arranged with input values in strictly ascending order.
03-01 17:17:32.563 9369 9369 E AndroidRuntime: [step, [line-progress], [rgba, 0.0, 0.0, 0.0, 0.0], 0.0, [rgba, 86.0, 168.0, 251.0, 1.0], 7.875125394489743E-4, [rgba, 255.0, 149.0, 0.0, 1.0], 9.88627405946961E-4, [rgba, 86.0, 168.0, 251.0, 1.0], 0.0011926985676139702, [rgba, 255.0, 149.0, 0.0, 1.0], 0.0013977277614471628, [rgba, 86.0, 168.0, 251.0, 1.0], 0.0033578768991905975, [rgba, 255.0, 149.0, 0.0, 1.0], 0.0037507795836246864, [rgba, 255.0, 77.0, 77.0, 1.0], 0.00428216554000383, [rgba, 255.0, 149.0, 0.0, 1.0], 0.0044759909456938245, [rgba, 255.0, 77.0, 77.0, 1.0], 0.004657028835129699, [rgba, 255.0, 149.0, 0.0, 1.0], 0.004829865852316603, [rgba, 86.0, 168.0, 251.0, 1.0], 0.005419653095114879, [rgba, 255.0, 149.0, 0.0, 1.0], 0.005614747300723064, [rgba, 255.0, 77.0, 77.0, 1.0], 0.0059445863301272285, [rgba, 255.0, 149.0, 0.0, 1.0], 0.006117482621053818, [rgba, 255.0, 77.0, 77.0, 1.0], 0.006294416253991319, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01030611646105476, [rgba, 255.0, 77.0, 77.0, 1.0], 0.0108313939086527, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01087917016026279, [rgba, 255.0, 149.0, 0.0, 1.0], 0.011206022041197168, [rgba, 86.0, 168.0, 251.0, 1.0], 0.011375244777193975, [rgba, 255.0, 149.0, 0.0, 1.0], 0.011897718963852529, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01300324864501124, [rgba, 255.0, 77.0, 77.0, 1.0], 0.014552480861430754, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01459098401874158, [rgba, 255.0, 149.0, 0.0, 1.0], 0.014632236595381418, [rgba, 86.0, 168.0, 251.0, 1.0], 0.014691003769508958, [rgba, 255.0, 77.0, 77.0, 1.0], 0.015990303573832496, [rgba, 255.0, 149.0, 0.0, 1.0], 0.016063880506100123, [rgba, 255.0, 77.0, 77.0, 1.0], 0.016222054799993918, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01713261289631391, [rgba, 255.0, 149.0, 0.0, 1.0], 0.018118074285164838, [rgba, 86.0, 168.0, 251.0, 1.0], 0.018197580482840932, [rgba, 255.0, 77.0, 77.0, 1.0], 0.019076286791315563, [rgba, 86.0, 168.0, 251.0, 1.0], 0.01912331700249868, [rgba, 255.0, 149.0, 0.0, 1.0], 0.019146361796154452, [rgba, 86.0, 168.0, 251.0, 1.0], 0.020479019688330435, [rgba, 255.0, 149.0, 0.0, 1.0], 0.02054592740436211, [rgba, 86.0, 168.0, 251.0, 1.0], 0.021113888733876318, [rgba, 255.0, 149.0, 0.0, 1.0], 0.021741284451098616, [rgba, 86.0, 168.0, 251.0, 1.0], 0.0223665594221516, [rgba, 255.0, 77.0, 77.0, 1.0], 0.02289417267962719, [rgba, 255.0, 149.0, 0.0, 1.0], 0.02363452976417874, [rgba, 86.0, 168.0, 251.0, 1.0], 0.024393077305679925, [rgba, 255.0, 149.0, 0.0, 1.0], 0.024432906173326826, [rgba, 86.0, 168.0, 251.0, 1.0], 0.024528690700983784, [rgba, 255.0, 149.0, 0.0, 1.0], 0.024811953358393656, [rgba, 86.0, 168.0, 251.0, 1.0], 0.0252052020335353, [rgba, 255.0, 149.0, 0.0, 1.0], 0.026783093208889525, [rgba, 86.0, 168.0, 251.0, 1.0], 0.02767956413266397, [rgba, 255.0, 77.0, 77.0, 1.0], 0.028738297027105255, [rgba, 255.0, 149.0, 0.0, 1.0], 0.02949357473569539, [rgba, 86.0, 168.0, 251.0, 1.0], 0.032104706622261565, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03256961856777844, [rgba, 86.0, 168.0, 251.0, 1.0], 0.03349758358455919, [rgba, 255.0, 149.0, 0.0, 1.0], 0.033909082978182306, [rgba, 255.0, 77.0, 77.0, 1.0], 0.034445347781102656, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03489754683769594, [rgba, 86.0, 168.0, 251.0, 1.0], 0.03516006880499822, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03521337642718707, [rgba, 255.0, 77.0, 77.0, 1.0], 0.03533537317739218, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03572052888114835, [rgba, 86.0, 168.0, 251.0, 1.0], 0.03699530509267774, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03752053505121288, [rgba, 255.0, 77.0, 77.0, 1.0], 0.03789567417056518, [rgba, 86.0, 168.0, 251.0, 1.0], 0.0381643927012216, [rgba, 255.0, 149.0, 0.0, 1.0], 0.038306439856407, [rgba, 86.0, 168.0, 251.0, 1.0], 0.03843951665959453, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03918814781193041, [rgba, 255.0, 77.0, 77.0, 1.0], 0.03956403988185464, [rgba, 255.0, 149.0, 0.0, 1.0], 0.03996196203316792, [rgba, 86.0, 168.0, 251.0, 1.0], 0.040401334376425395, [rgba, 255.0, 77.0, 77.0, 1.0], 0.04112590301011657, [rgba, 255.0, 149.0, 0.0, 1.0], 0.04124954106157948, [rgba, 255.0, 77.0, 77.0, 1.
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03-01 17:17:32.566 9369 9369 E AndroidRuntime: 717, [rgba, 86.0, 168.0, 251.0, 1.0], 0.988344406844511, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9884025357682557, [rgba, 86.0, 168.0, 251.0, 1.0], 0.988658047341771, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9891100641653449, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9891428166014855, [rgba, 255.0, 77.0, 77.0, 1.0], 0.9896096691430719, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9896964578237198, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9898405575977185, [rgba, 86.0, 168.0, 251.0, 1.0], 0.99011033479715, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9904030313397023, [rgba, 255.0, 77.0, 77.0, 1.0], 0.9904042593816811, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9913089853746921, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9917101837233043, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9919586673590555, [rgba, 255.0, 77.0, 77.0, 1.0], 0.9921260962667136, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9959890563158521, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9971895463934567, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9972247912745746, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9973833976000469, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9977477883459286, [rgba, 255.0, 77.0, 77.0, 1.0], 0.9982888724384885, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9984693611912612, [rgba, 255.0, 149.0, 0.0, 1.0], 0.9991970491388187, [rgba, 86.0, 168.0, 251.0, 1.0], 0.9999170692621651, [rgba, 255.0, 149.0, 0.0, 1.0]]
03-01 17:17:32.566 9369 9369 E AndroidRuntime: at com.mapbox.maps.extension.style.layers.Layer.updateProperty(Layer.kt:141)
03-01 17:17:32.566 9369 9369 E AndroidRuntime: at com.mapbox.maps.extension.style.layers.Layer.setProperty$extension_style_release(Layer.kt:130)
03-01 17:17:32.566 9369 9369 E AndroidRuntime: at com.mapbox.maps.extension.style.layers.generated.LineLayer.lineGradient(LineLayer.kt:819)
03-01 17:17:32.566 9369 9369 E AndroidRuntime: at com.mapbox.navigation.ui.maps.route.line.api.MapboxRouteLineView.updateLineGradient(MapboxRouteLineView.kt:218)
03-01 17:17:32.566 9369 9369 E AndroidRuntime: at com.mapbox.navigation.ui.maps.route.line.api.MapboxRouteLineView.render(MapboxRouteLineView.kt:38)

[evabishchevich]

+1, on beta.9

[cafesilencio]

@evabishchevich Did you get this error on beta 9? If so upgrade to beta 9.1 (there was a bug fix) or beta 10.

[evabishchevich]

@evabishchevich Did you get this error on beta 9? If so upgrade to beta 9.1 (there was a bug fix) or beta 10.

thx 🤗

[Guardiola31337]

@cafesilencio @evabishchevich has this already been addressed?

[cafesilencio]

This has been addressed. I don't believe it's currently and issue.