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We are trying to plot a cloropleth map using Deck.gl - Polygon in Superset. 

### Superset version
0.27.0

### Expected results
Cloropleth map plotting a numeric variable (VALUECOL in the example below).

### Actual results
No errors, no plot of polygons

### Steps to reproduce
We are trying to plot some data using Polygons. We have tried using both 
Polyline encoding (POLYLINE column) and JSON encoding (GEOJSON Column) but none 
of them seem to work, nor they throw any error. 

Besides passing Lines column and Lines encoding, how do we set VALUECOL as the 
data we want to plot?

Find a table with example data below:

|LOCATIONNAME|POLYLINE|GEOJSON|VALUECOL|
|------------|--------|------------|--------|
|Palomas|mp{uFnhcUiDZmBCmA[gBuAk@gAgFqRoCeKs@mB}@iBkAcBiAcA}HyFzG_P`GeNpB{IfD_QtAwExBoEZa@rBoBvDuBfH_AJbKDrJ@hFDd\Dtf@Zdg@{F`@|{"type":"Feature","properties":{"LOCATIONID":"0-EU-ES-28-07-001-079-16-001","LOCATIONNAME":"Palomas"},"geometry":{"type":"Polygon","coordinates":[[[-3.626482,40.4508],[-3.626626,40.45164],[-3.626607,40.452196],[-3.626465,40.452589],[-3.626035,40.453107],[-3.625674,40.45333],[-3.622549,40.454489],[-3.620595,40.455204],[-3.620043,40.455461],[-3.619513,40.455779],[-3.619014,40.456158],[-3.618672,40.456523],[-3.617425,40.458119],[-3.614706,40.456691],[-3.61228,40.455405],[-3.610539,40.454832],[-3.607656,40.453993],[-3.606572,40.45357],[-3.605536,40.452957],[-3.605367,40.452816],[-3.604804,40.45224],[-3.604218,40.451311],[-3.603894,40.449832],[-3.605833,40.449775],[-3.607698,40.449744],[-3.608866,40.449733],[-3.613533,40.449701],[-3.619886,40.449677],[-3.626318,40.449535],[-3.626482,40.4508]]]}}|4538.461538461538|
|Conde 
Orgaz-Piovera|ug{uFj_dUh@`Ll@lHrAbPC|Hq@jKuCzZc@jE?~Fj@dG}XvReLrJgFjEMk@MsBO_GAsB?_BBcBFyMC_BUiRCo@qGsE}DeDuCkCi@g@yEkIyAgCq@mAi@sBUiBIcBBmRDiS?eCFy[@qIe@mAtK}ItBoCrE}InEcJpHjFjAbAhAdBz@bBv@tBvCbLzErQl@dAhBvAfAXtBDn@GpJu@\xV|{"type":"Feature","properties":{"LOCATIONID":"0-EU-ES-28-07-001-079-16-002","LOCATIONNAME":"Conde
 
Orgaz-Piovera"},"geometry":{"type":"Polygon","coordinates":[[[-3.63014,40.449394],[-3.632231,40.44919],[-3.633741,40.448951],[-3.636482,40.448535],[-3.638075,40.448553],[-3.640057,40.448801],[-3.644518,40.449551],[-3.645532,40.44974],[-3.646818,40.449737],[-3.648121,40.449515],[-3.651289,40.453663],[-3.653143,40.455779],[-3.654163,40.45694],[-3.65395,40.457007],[-3.653369,40.457073],[-3.652083,40.457154],[-3.651504,40.457167],[-3.651027,40.457161],[-3.650526,40.457149],[-3.648153,40.457108],[-3.647678,40.45712],[-3.64458,40.457239],[-3.644346,40.457251],[-3.643285,40.458625],[-3.642459,40.459573],[-3.641759,40.460326],[-3.641555,40.460531],[-3.639893,40.4
 
61622],[-3.639216,40.462078],[-3.638829,40.46233],[-3.638242,40.462536],[-3.637711,40.462642],[-3.637215,40.462694],[-3.634108,40.462676],[-3.630856,40.462643],[-3.630181,40.462643],[-3.625576,40.462606],[-3.623886,40.462593],[-3.623494,40.462784],[-3.621747,40.460753],[-3.62102,40.460163],[-3.619273,40.459105],[-3.617495,40.458062],[-3.618679,40.45654],[-3.619018,40.456159],[-3.619525,40.455786],[-3.62002,40.455484],[-3.620615,40.455208],[-3.622712,40.454441],[-3.625693,40.453345],[-3.626046,40.453118],[-3.626485,40.452587],[-3.626612,40.452222],[-3.626645,40.451635],[-3.626601,40.451397],[-3.62633,40.449547],[-3.63014,40.449394]]]}}|4761.9047619047615|
|Canillas|yv|uFpuhUoNbLcMnSeBvCcCwC_@g@k@[c@Eq@B[HOBOBS@S?q@NuF_H{@_Bq@wAk@eBo@qC]iC{AiVOsCy@{Ek@eDcDaRaDeRjAWHiADySrAm[MkBm@_Dj@mOf@gFVsBIyBzHqFfIyFpHmFlDsCd@lAA`FGt\?~DApHE`SA~IH`BThBf@tBx@vA~AjCpA|BzB|Dx@v@x@t@fAbAfElDj@`@~EjDBhBHbGJxHBhAE`GEhJ?fA?xAJlDF~BFnAPn@|{"type":"Feature","properties":{"LOCATIONID":"0-EU-ES-28-07-001-079-16-003","LOCATIONNAME":"Canillas"},"geometry":{"type":"Polygon","coordinates":[[[-3.65418,40.456939],[-3.656279,40.459412],[-3.659557,40.461671],[-3.660311,40.462181],[-3.659557,40.462845],[-3.659353,40.46301],[-3.659211,40.463229],[-3.659181,40.463409],[-3.659208,40.463659],[-3.659252,40.4638],[-3.659277,40.463877],[-3.659299,40.463951],[-3.659306,40.464058],[-3.659305,40.464157],[-3.659389,40.464404],[-3.657949,40.465632],[-3.657466,40.465936],[-3.657027,40.466181],[-3.656511,40.466404],[-3.655789,40.466649],[-3.655097,40.466797],[-3.651369,40.467252],[-3.65063,40.46734],[-3.649528,40.467623],[-3.648693,40.467845],[-3.64564,40.468666],[-3.
 
642576,40.469477],[-3.642455,40.469097],[-3.642081,40.469049],[-3.638756,40.469011],[-3.634206,40.4686],[-3.633662,40.468661],[-3.632861,40.468898],[-3.630231,40.468674],[-3.629075,40.46847],[-3.6285,40.468357],[-3.62788,40.468402],[-3.626671,40.466821],[-3.625424,40.465182],[-3.62424,40.463657],[-3.623495,40.462786],[-3.623889,40.462596],[-3.625019,40.462605],[-3.629767,40.462643],[-3.630724,40.462644],[-3.63225,40.462659],[-3.635466,40.462687],[-3.63723,40.462696],[-3.637714,40.462647],[-3.638244,40.462537],[-3.63883,40.462333],[-3.639277,40.462043],[-3.639977,40.46157],[-3.640606,40.461157],[-3.641556,40.460534],[-3.641834,40.460247],[-3.64211,40.459951],[-3.642448,40.459592],[-3.643319,40.458592],[-3.643485,40.458374],[-3.644346,40.457254],[-3.644876,40.457232],[-3.646177,40.457181],[-3.647748,40.457121],[-3.648116,40.45711],[-3.649406,40.457131],[-3.651213,40.457169],[-3.651571,40.457168],[-3.652023,40.457162],[-3.652895,40.457106],[-3.653531,40.457064],[-3.65394,40.45702],[-3.
 65418,40.456939]]]}}|3024.6913580246915|





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https://github.com/apache/incubator-superset/issues/5976 ]
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