Filtering extractionFunction-custom extension

[chirpy2291]

Unable to filter custom extensions created through dimension specs in superset.
I am able to filter them through Result Filters only.

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.21

Expected results

should be able to filter through Filters

Actual results

No effect with filters.

Steps to reproduce

create a dimension with dimension spec of extractionFn:

For ex:
{
"type" : "extraction",
"dimension": "oldDimension",
"outputName": "newDimension",
"outputType": "STRING",
"extractionFn": {
"type": "javascript",
"function": "function(value) { return value.split('-', 1)[0]; }"
}
}

And try to filter the same after grouping it.We can only filter via Result Filters.Please provide a fix.

[xrmx]

Please reproduce with latest version

[ghulands]

@chirpy2291 cherry pick #4740 for this.

[stale]

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