Have Store sequence functions use Sequence directly and remove from QueryContext
Replace sequence/identity default with custom expression that uses sequence directly
Support sequence and function defaults in ADD COLUMN
Update expected plans
Pull into helper and comment for clarity
Add a test that demonstrates the subquery join manifestation.
Add a test with the other manifestation.
Put subquery source with limit into more standard form.
Now get reasonable plans.
No auto-UNIQUE for SERIAL columns
Find actual identity generators instead of assuming a name
Generate friendlier sequence names for the common case
Expected name updates
Do not allow NULL INSERT for an IDENTITY column
merge nathanlws: SERIAL/IDENTITY tweaks and fixes

Merge pull request #1153 from nathanlws/sql-layer/sequence-tweaks-and-fixes
https://github.com/FoundationDB/sql-layer/pull/1153