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Add 2 columns and drop 2 columns at 3 different depths of nesting
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OpenJDK 64-Bit Server VM 1.8.0_212-b03 on Mac OS X 10.14.6
Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
Add 2 columns and drop 2 columns at 3 different depths of nesting:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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To non-nullable StructTypes using performant method                           10             11           2          0.0      Infinity       1.0X
To nullable StructTypes using performant method                                9             10           1          0.0      Infinity       1.0X
To non-nullable StructTypes using non-performant method                     2457           2464          10          0.0      Infinity       0.0X
To nullable StructTypes using non-performant method                        42641          43804        1644          0.0      Infinity       0.0X


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Add 50 columns and drop 50 columns at 100 different depths of nesting
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OpenJDK 64-Bit Server VM 1.8.0_212-b03 on Mac OS X 10.14.6
Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
Add 50 columns and drop 50 columns at 100 different depths of nesting:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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To non-nullable StructTypes using performant method                             4595           4927         470          0.0      Infinity       1.0X
To nullable StructTypes using performant method                                 5185           5516         468          0.0      Infinity       0.9X