[Feature Request] [Spark] OPTIMIZE DRY RUN

[felipepessoto]

Feature request

Which Delta project/connector is this regarding?

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

Overview

Follow-up of #3081 (comment).

It would work similar to VACUUM DRY RUN, showing the list of files and its size, and a message of total number/size.

Motivation

OPTIMIZE command can take several minutes to run, adding a DRY RUN option gives the user some idea of how many files are eligible for optimization and then they can plan accordingly.

Willingness to contribute

The Delta Lake Community encourages new feature contributions. Would you or another member of your organization be willing to contribute an implementation of this feature?

• Yes. I can contribute this feature independently.
• Yes. I would be willing to contribute this feature with guidance from the Delta Lake community.
• No. I cannot contribute this feature at this time.