Enable Subcolumn Reading for Distributed Tables

Why it matters

This feature addresses the limitation where subcolumns of nested data structures could not be individually read from distributed tables. By allowing reading subcolumns directly, it improves query flexibility and performance when working with nested or complex data in distributed environments.

How to use it

Users can now query subcolumns from distributed tables as they would from local tables, without any special configuration. Simply use the subcolumn notation in your SELECT queries on distributed tables to access nested data.