Spark tbls to combine.

Each argument can either be a Spark DataFrame or a list of Spark DataFrames

When row-binding, columns are matched by name, and any missing columns with be filled with NA.

When column-binding, rows are matched by position, so all data frames must have the same number of rows.

Data frame identifier.

When id is supplied, a new column of identifiers is created to link each row to its original Spark DataFrame. The labels are taken from the named arguments to sdf_bind_rows(). When a list of Spark DataFrames is supplied, the labels are taken from the names of the list. If no names are found a numeric sequence is used instead.