tree 07b7ed90699351adf4599204541cdaec6ebcad64
parent 3377ddf69e0be9ddacf0330c45c0649eade8ba3e
author Garret Rieger <grieger@google.com> 1666391597 +0000
committer Behdad Esfahbod <behdad@behdad.org> 1666398563 -0600

[subset] Always output Lookup's even if they are empty.

The rest of layout subsetting depends on lookup indices being consistent with those computed during planning. So if an empty lookup is discarded during the subset phase it will invalidate all subsequent lookup indices. Generally we shouldn't end up with an empty lookup as we pre-prune them during the planning phase, but it can happen in rare cases such as when a subtable is considered degenerate (eg. #3853)