[GitHub] Wujiao233 opened a new issue #5394: he Heatmap cannot be render when x or y is null

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Wujiao233 opened a new issue #5394: he Heatmap cannot be render when x or y is null
URL: https://github.com/apache/incubator-superset/issues/5394
 
 
   Make sure these boxes are checked before submitting your issue - thank you!
   
   - [x] I have checked the superset logs for python stacktraces and included it here as text if any
   - [x] I have reproduced the issue with at least the latest released version of superset
   - [x] I have checked the issue tracker for the same issue and I haven't found one similar
   
   
   ### Superset version
   
    0.26.3
   
   ### Expected results
   when render a heatmap. The null value of x and y should be ignore or display as 'null'.
   
   ### Actual results
   a error has occurred
   
   On GitHub-master is:
   `TypeError: Cannot read property 'toString' of null`
   and on 0.26.3 is:
   `TypeError: null is not an object (evaluating 's.x.toString')`
   
   and no error at python logs.
   
   ### Steps to reproduce
   create a table with null value in x or y field, And create a slice as heatmap.
   
   SQL: `select null as A ,'b' as  B  ,24 as val ;`
   And use the result to generate a heat map.
   

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