{op} received a function argument and cannot cross the worker boundary; running on the main thread

Warnings reference › worker/local-*

Identifier

worker/local-*

Raised by

The grid (background worker)

Since

1.0.1

What happened

Informational, not a fault. This pass was big enough to be worth offloading and the worker was ready, but one of its arguments is a function - a comparator, a predicate, a value getter - and a function cannot be structured-cloned to a worker. The pass ran on the main thread instead, with the same result and no parallelism. The key carries the operation, so a grid that does this for sort and filter says so once each.

The fix

Nothing is broken. If the main-thread cost matters, express the rule in data rather than in a closure - a declared column type, a filters.where condition, or sort by column id - so the plan is portable and can be offloaded.

Reference

Covered in full at the API reference.