0.22.0

Breaking changes

• Renamed TruncateStmt.table field to tables which now contains ListExpr
• Moved ReturningClause and ClusterByClause types from AllSelectClauses to AllOtherClauses
• Renamed UpsertClause.columns field to conflictTarget
• Divided MergeStmt to MergeStmt and MergeClause (to accommodate WithClause inside MergeStmt)
• Renamed MergeActionInsert.values field to clauses

Improved PostgreSQL support

• Full support for UPDATE statement
  • Support [ONLY] table [*]
  • Support SET col = DEFAULT
  • Support WHERE CURRENT OF clause
• Full support for DELETE statement
  • Support [ONLY] table [*]
  • Support USING clause
  • Support WHERE CURRENT OF clause
• Full support for TRUNCATE statement
  • Support [ONLY] table [*]
  • Support multiple tables
  • Support CASCADE/RESTRICT
  • Support RESTART/CONTINUE IDENTITY
• Full support for MERGE statement
  • Support WITH clause
  • Support [ONLY] table [*]
  • Support OVERRIDING clause
  • Support INSERT DEFAULT VALUES
  • Support DO NOTHING action
• Almost full support for INSERT statement
  • Support ON CONFLICT clause
  • Support ON CONFLICT (expr)
  • Support ON CONFLICT ON CONSTRAINT
  • Support OVERRIDING clause

Bugfixes

• Fixed some serious performance regressions, especially when parsing PostgreSQL (#52)
• YEAR_MONTH keyword is now case-insensitive (like all others)