pgsql: vacuumdb: Add option for analyzing only relations missing stats.

vacuumdb: Add option for analyzing only relations missing stats.

This commit adds a new --missing-only option that can be used in
conjunction with --analyze-only and --analyze-in-stages. When this
option is specified, vacuumdb will generate ANALYZE commands for a
relation if it is missing any statistics it should ordinarily have.
For example, if a table has statistics for one column but not
another, we will analyze the whole table. A similar principle
applies to extended statistics, expression indexes, and table
inheritance.

Co-authored-by: Corey Huinker <corey(dot)huinker(at)gmail(dot)com>
Reviewed-by: TODO
Discussion: https://postgr.es/m/Z5O1bpcwDrMgyrYy%40nathan

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/5f8eb25706b62923c53172e453c8a4dedd877a3d
Author: Nathan Bossart <nathan(at)postgresql(dot)org>

Modified Files
--------------
doc/src/sgml/ref/vacuumdb.sgml | 16 ++++++
src/bin/scripts/t/102_vacuumdb_stages.pl | 60 +++++++++++++++++++++
src/bin/scripts/vacuumdb.c | 92 ++++++++++++++++++++++++++++++++
src/test/perl/PostgreSQL/Test/Cluster.pm | 27 ++++++++++
4 files changed, 195 insertions(+)