[Feature Request] Leverage column stats from catalog in kernel connector

[gengliangwang]

Feature request

Which Delta project/connector is this regarding?

• Spark
• Standalone
• Flink
• Kernel
• Other (fill in here)

Overview

Follow-up to https://github.com/delta-io/delta/pull/5894/changes#r2738066772. When column statistics are available, the connector should use the average column length for size estimation instead of the default data type size.