This release introduces several improvements to the query analyzer:

• Tables can now be joined to subqueries using indexes
• Indexes and other optimizations now work in INSERT ... SELECT statements
• Null-safe equals operator (<=>)

Merged PRs

• 1303: go/go.mod: Bump go-mysql-server
• 295: Changed analysis to isolate the values side of an INSERT statement
  Also cleaned up create trigger analysis, which broke when I did this at first. Now catches more errors than before.
• 294: Fixed a bug in join planning for Inserts.
  Table reordering was leaving nodes above the join with incorrect field indexes. This was getting fixed by other analyzer steps for some top-level nodes, but not Inserts.
• 293: Implement NullSafeEquals: The <=> operator in MySQL.
• 292: Make join planning work for insert statements
• 291: Consider SubqueryAlias nodes when planning indexed joins.