Is it more efficient to read a single column of a structure or multiple columns in Apache Arrow?

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It is generally more efficient to read multiple columns of a structure in Apache Arrow because the data is stored in a columnar format, which allows for better memory utilization and cache efficiency. Reading a single column requires reading the entire column, including any unused memory, leading to increased data transfer and processing time. However, if the application only needs to access a single column, it may be more efficient to read that column alone. The optimal approach depends on the specific use case and data access patterns.