Decides which schemas still need their indexes read, honoring analysis.useExistingIndexes.
When it is off, indexes left in a resumed state by an earlier run are dropped, so neither the prompt
hints nor index-backed PK candidates use them, and nothing is returned to load. Otherwise returns the
schemas with at least one table whose indexes were never read.
Decides which schemas still need their indexes read, honoring
analysis.useExistingIndexes. When it is off, indexes left in a resumed state by an earlier run are dropped, so neither the prompt hints nor index-backed PK candidates use them, and nothing is returned to load. Otherwise returns the schemas with at least one table whose indexes were never read.