stream ingest.useWorker is on but a column reads through a closure (a computed or date column); columnizing on the main thread instead.

Warnings reference › source.stream.ingest-worker

Identifier

source.stream.ingest-worker

Raised by

The grid (core)

Since

1.16.0

What happened

Informational. Columnising off-thread needs a schema that can cross the worker boundary, and a column that reads through a closure - a computed column, or a date column with a toStorage - cannot. The schema will not change mid-stream, so the worker path is ruled out once rather than probed for every chunk, and ingest runs on the main thread.

The fix

Nothing is wrong. To get the off-thread path, express the column's reading declaratively rather than as a function.

Reference

Covered in full at the API reference.