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.
merge MMcM: Problems associated with semi-joins via IN with a subquery that has a LIMIT

Merge pull request #1152 from MMcM/sql-layer/semi-join-subquery-limit
https://github.com/FoundationDB/sql-layer/pull/1152
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
Test functions that take VARBINARY against VARCHAR with character sets.