wip: sql: min row count 1 plus unbounded cardinality flag

[mgartner]

No description provided.

[blathers-crl]

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[cockroach-teamcity]

This change is 

[rytaft]

The regression in TPC-C is a little concerning... otherwise looks good

Reviewed 2 of 37 files at r1.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @mgartner)

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pkg/sql/opt/xform/testdata/external/tpcc line 763 at r1 (raw file):

           │    └── fd: ()-->(2,3), (1)-->(4-6,17)
           └── filters
                └── c_last:6 = 'Smith' [outer=(6), constraints=(/6: [/'Smith' - /'Smith']; tight), fd=()-->(6)]

This looks like a regression

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pkg/sql/opt/xform/testdata/physprops/ordering line 3023 at r1 (raw file):

           │    └── filters
           │         └── tab_171968.col1_3 = tab_171969.col1_3
           └── filters (true)

Also looks like it might be a regression

[mgartner]

Closing in favor of #140065 and #139985.

@rytaft pointed out some regressions above that we should be mindful of if we enable this setting by default.