[Proposal]: possibly cache ``=Flow\ETL\Rows::schema`

[bendavies]

Describe the Proposal

nearly 40% of our ETL is spent in Flow\ETL\Rows::schema
is this a candicate for cache?

API Adjustments

No response

Are you intending to also work on proposed change?

None

Are you interested in sponsoring this change?

None

Integration & Dependencies

No response

[norberttech]

Yes! There should be a schema mnemonic since now we are just iterating over each row their schemas which internally iterates over entire merging their rows definitions.
I think both layers could benefit from mnemonics. Will try to do it today and mark a new release

[norberttech]

@bendavies could you try version 1.x-dev?
That PR I just merged should significantly improve DbalLoader performance.
I managed to refactor it so it's not longer using Rows::schema() but I also optimized Schema::merge and few other places like Entry::definition() which should result in overall ETL pipelines performance improvement