Huge Memory Consumption in Batch Insert/Updates in 0.42.2

[caleblloyd]

Upstream issue reported at PomeloFoundation/Pomelo.EntityFrameworkCore.MySql#633

Insert/Update queries that use Batching in EF Core used to consume ~4MiB of memory are now consuming 2000-5000MiB of memory.

Mitigation was to downgrade from 0.42.2 to 0.42.1: PomeloFoundation/Pomelo.EntityFrameworkCore.MySql#638

Possible root cause commits solely based on the version number are these 2:

• 0f78099 (Add ResizableArray)
• 69080de (Remove result set buffering.)

[bgrainger]

The excess memory usage appears to be related to ResizableArray:

[bgrainger]

@caleblloyd I'll ship a fix for this as soon as the Appveyor build stops having spurious failures.

[bgrainger]

Fixed in 0.42.3.