Merged PRs

dolt

4315: create db when no current db is set should use the dbs available in session
If there is no current database selected, use databases that are available within the session and use the common format for those databases.
4302: Changes to SQL output, including row summary, timing and empty set output
This changes the SQL shell to more closely match the MySQL shell by adding an "empty set" output, row count, and timing info.
It also gets rid of the use of pipelines for printing, replacing with SqlRowWriter implementations.
4296: add --author flag to merge
4267: Add dolt diff --skinny flag
Closes #790
Adds a --skinny flag to dolt diff, which only shows primary keys and columns with changes.
Note that writeDiffResults has been split into 2 functions - writeFilteredRows and getDiffRows. The former is responsible for printing the rows, while the latter function collects the relevant columns, depending on if the --skinny flag is active.
Also note that in the event of row addition/deletions, all columns will be included when the --skinny flag is active.

1250: stripNodes in subquery block apply_hash_lookup optimization
A HashLookup requires two rules, 1) converting a JOIN -> SUBQUERY_ALIAS => JOIN => CACHED_RESULT(SQ), 2) converting the CACHED_RESULT into a HASHED_LOOKUP.
Prevent StripRowNode from breaking the pattern matcher for the first step. Other nodes can still interrupt the rule, but we have a test now at least.
1249: UpdateJoin bug fixes
Bug fixes for #4288
- qualifying check constraint expressions when multiple tables are being updated
- support finding UpdatableTables through ProcessIndexableTable and ProcessTable nodes
- erroring out when a table updater isn't available for a SetField expression, instead of silently dropping it
  This does not address another UpdateJoin bug I just found while testing: #4304. Mentioning that one here so we have this context connected when we go to fix it.
  I verified that Dolt's enginetest suite runs correctly with these changes.
1248: feat:(sql function) support last_insert_id with expr
mysql support parameter for LAST_INSERT_ID(expr), it is useful in upsert query when we want to get the updated recored id
ref: https://dev.mysql.com/doc/refman/8.0/en/information-functions.html#function_last-insert-id
1246: adding LEAD() window function
Partial fix for: #4260

4306: Panic on "conflicting" result types in IF() function
790: dolt diff --skinny: Only show primary keys and columns with changes. Hide other columns.
4311: Diff shows rows that have no diffs when a column has been added in the past.
4290: CALL DOLT_CHECKOUT() on an existing branch give "branch already exists" error
4289: dolt_diff_<table> only works if to_commit is in your current branch
4307: Feature Request: Way to create db in new format via sql
4295: Specify explicit author in dolt_merge procedure