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For example, to add two dictionaries with a common list of keys, add their corresponding values.
Thus in order to make a column dictionary with a single column, we need to enlist the single key and enlist the single column list.
to a nested list creates a copy of the original list in which the data has been reorganized.
On disjoint keys, the appropriate null is effectively substituted for missing values.
Due to all nulls being equal, a null value on a disjoint key will report ;i] The indexing-at-depth notation suggests thinking of the column dictionary as a two-dimensional data structure, indexed by column name and column position.