val keysDF = mapTypeDF.select(explode(map_keys($"property"))).distinct()
val keys = keysDF.collect().map(f=>f.get(0))
val keyCols = keys.map(f=> col("property").getItem(f).as(f.toString))
val expandedDf = mapTypeDF.select(col("name") +: keyCols:_*).show(false)
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