Revert "always select only the pertinent columns for a in-batches-pluck"
Revert "always select only the pertinent columns for a in-batches-pluck"

This reverts commit 9d6863e5afbceda35d2775104c3ace19ac339c51.

Reason for revert: COPY strategy is broken

Change-Id: I82e2d0d6c851b5db1f283a4a854557033c692e3f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/267653
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms