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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project aims to adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Given that the parser produces a typed AST, any changes to the AST will technically be breaking and thus will result in a `0.(N+1)` version. We document changes that break via addition as "Added".
+
+## [Unreleased]
+Nothing here yet! Check https://github.com/andygrove/sqlparser-rs/commits/master for undocumented changes.
+
+## [0.4.0] - 2019-07-02
+This release brings us closer to SQL-92 support, mainly thanks to the improvements contributed back from @MaterializeInc's fork and other work by @benesch.
+
+### Changed
+- Remove "SQL" from type and enum variant names, `SQLType` -> `DataType`, remove "sql" prefix from module names (#105, #122)
+- Rename `ASTNode` -> `Expr` (#119)
+- Improve consistency of binary/unary op nodes (#112):
+    - `ASTNode::SQLBinaryExpr` is now `Expr::BinaryOp` and `ASTNode::SQLUnary` is `Expr::UnaryOp`;
+    - The `op: SQLOperator` field is now either a `BinaryOperator` or an `UnaryOperator`.
+- Change the representation of JOINs to match the standard (#109): `SQLSelect`'s `relation` and `joins` are replaced with `from: Vec<TableWithJoins>`. Before this change `FROM foo NATURAL JOIN bar, baz` was represented as "foo" as the `relation` followed by two joins (`Inner(Natural)` and `Implicit`); now it's two `TableWithJoins` (`foo NATURAL JOIN bar` and `baz`).
+- Extract a `SQLFunction` struct (#89)
+- Replace `Option<Vec<T>>` with `Vec<T>` in the AST structs (#73)
+- Change `Value::Long()` to be unsigned, use u64 consistently (#65)
+
+### Added
+- Infra:
+    - Implement `fmt::Display` on AST nodes (#124) - thanks @vemoo!
+    - Implement `Hash` (#88) and `Eq` (#123) on all AST nodes
+    - Implement `std::error::Error` for `ParserError` (#72)
+    - Handle Windows line-breaks (#54)
+- Expressions:
+    - Support `INTERVAL` literals (#103)
+    - Support `DATE` / `TIME` / `TIMESTAMP` literals (#99)
+    - Support `EXTRACT` (#96)
+    - Support `X'hex value'` literals (#95)
+    - Support `EXISTS` subqueries (#90)
+    - Support nested expressions in `BETWEEN` (#80)
+    - Support `COUNT(DISTINCT x)` and similar (#77)
+    - Support `CASE operand WHEN expected_value THEN ..` and table-valued functions (#59)
+    - Support analytic (window) functions (`OVER` clause) (#50)
+- Queries / DML:
+    - Support nested joins (#100) and derived tables with set operations (#111)
+    - Support `UPDATE` statements (#97)
+    - Support `INSERT INTO foo SELECT * FROM bar` and `FROM VALUES (...)` (#91)
+    - Support `SELECT ALL` (#76)
+    - Add `FETCH` and `OFFSET` support, and `LATERAL` (#69) - thanks @thomas-jeepe!
+    - Support `COLLATE`, optional column list in CTEs (#64)
+- DDL/TCL:
+    - Support `START/SET/COMMIT/ROLLBACK TRANSACTION` (#106) - thanks @SamuelMarks!
+    - Parse column constraints in any order (#93)
+    - Parse `DECIMAL` and `DEC` aliases for `NUMERIC` type (#92)
+    - Support `DROP [TABLE|VIEW]` (#75)
+    - Support arbitrary `WITH` options for `CREATE [TABLE|VIEW]` (#74)
+    - Support constraints in `CREATE TABLE` (#65)
+- Add basic MSSQL dialect (#61) and some MSSQL-specific features:
+    - `CROSS`/`OUTER APPLY` (#120)
+    - MSSQL identifier and alias parsing rules (#66)
+    - `WITH` hints (#59)
+
+### Fixed
+- Report an error for `SELECT * FROM a OUTER JOIN b` instead of parsing `OUTER` as an alias (#118)
+- Fix the precedence of `NOT LIKE` (#82) and unary `NOT` (#107)
+- Do not panic when `NOT` is not followed by an expected keyword (#71)
+successfully instead of returning a parse error - thanks @ivanceras! (#67) - and similar fixes for queries with no `FROM` (#116)
+- Fix issues with `ALTER TABLE ADD CONSTRAINT` parsing (#65)
+- Serialize the "not equals" operator as `<>` instead of `!=` (#64)
+- Remove dependencies on `uuid` (#59) and `chrono` (#61)
+- Make `SELECT` query with `LIMIT` clause but no `WHERE` parse - Fix incorrect behavior of `ASTNode::SQLQualifiedWildcard::to_string()` (returned `foo*` instead of `foo.*`) - thanks @thomas-jeepe! (#52)
+
+## [0.3.1] - 2019-04-20
+### Added
+- Extended `SQLStatement::SQLCreateTable` to support Hive's EXTERNAL TABLES (`CREATE EXTERNAL TABLE .. STORED AS .. LOCATION '..'`) - thanks @zhzy0077! (#46)
+- Parse `SELECT DISTINCT` to `SQLSelect::distinct` (#49)
+
+## [0.3.0] - 2019-04-03
+### Changed
+This release includes major changes to the AST structs to add a number of features, as described in #37 and #43. In particular:
+- `ASTNode` variants that represent statements were extracted from `ASTNode` into a separate `SQLStatement` enum;
+    - `Parser::parse_sql` now returns a `Vec` of parsed statements.
+    - `ASTNode` now represents an expression (renamed to `Expr` in 0.4.0)
+- The query representation (formerly `ASTNode::SQLSelect`) became more complicated to support:
+    - `WITH` and `UNION`/`EXCEPT`/`INTERSECT` (via `SQLQuery`, `Cte`, and `SQLSetExpr`),
+    - aliases and qualified wildcards in `SELECT` (via `SQLSelectItem`),
+    - and aliases in `FROM`/`JOIN` (via `TableFactor`).
+- A new `SQLObjectName` struct is used instead of `String` or `ASTNode::SQLCompoundIdentifier` - for objects like tables, custom types, etc.
+- Added support for "delimited identifiers" and made keywords context-specific (thus accepting them as valid identifiers in most contexts) - **this caused a regression in parsing `SELECT .. FROM .. LIMIT ..` (#67), fixed in 0.4.0**
+
+### Added
+Other than the changes listed above, some less intrusive additions include:
+- Support `CREATE [MATERIALIZED] VIEW` statement
+- Support `IN`, `BETWEEN`, unary +/- in epressions
+- Support `CHAR` data type and `NUMERIC` not followed by `(p,s)`.
+- Support national string literals (`N'...'`)
+
+## [0.2.4] - 2019-03-08
+Same as 0.2.2.
+
+## [0.2.3] - 2019-03-08 [YANKED]
+
+## [0.2.2] - 2019-03-08
+### Changed
+- Removed `Value::String`, `Value::DoubleQuotedString`, and `Token::String`, making
+    - `'...'` parse as a string literal (`Value::SingleQuotedString`), and
+    - `"..."` fail to parse until version 0.3.0 (#36)
+
+## [0.2.1] - 2019-01-13
+We don't have a changelog for the changes made in 2018, but thanks to @crw5996, @cswinter, @fredrikroos, @ivanceras, @nickolay, @virattara for their contributions in the early stages of the project!
+
+## [0.1.0] - 2018-09-03
+Initial release