Module unnest 

Define a plan for unnesting values in columns that contain a list type.

Structs

ListUnnest

UnnestExec

Unnest the given columns (either with type struct or list) For list unnesting, each row is vertically transformed into multiple rows For struct unnesting, each column is horizontally transformed into multiple columns, Thus the original RecordBatch with dimension (n x m) may have new dimension (n’ x m’)