This change involves unifying the behavior of find and
agg for validation of $meta:"textScore". In particular, find
operations no longer require a "textScore" $meta projection
in order to specify a "textScore" $meta sort. This brings
find into alignment with agg, which never had such a
restriction. It is also now legal for a find command to
sort on the field overridden by a $meta:"textScore" projection
without specifying the $meta operator in the sort pattern.
In addition:
- Tightens validation around uses of "textScore" $meta
projections for queries that do not specify a $text
predicate.
- Fixes a bug in which $natural sort/hint were not
correctly validated.
This change results in the multi-planning mechanism
evaluating both non-blocking and blocking plans for the
$sort when possible. The system should no longer select a
non-blocking plan when a plan with a SORT stage is superior.
Anton Korshunov
Justin Seyster
David Storch
James Wahlin
clang-format-7.0.1
Charlie Swanson