• Fix iagnostic position when parsing undefined symbol.
• Improve handle error in data provider.
• Don't apply CROSS join operator if one of the tables is empty.
• Update docs for new Data provider design.
• Remove un needed code for remove hidden selection after engine.
• Support exponentiation operator.
• Optimize the calling of data provider if table is empty.
• Implement Select ... INTO OUTFILE.
• Support INTO OUTFILE Terminated options and enclosed.
• Implement Select ... into dumpfile feature.
• Improve error messages when use options with dumpfile.

Support JOIN more than two tables togther in same query.

• Handle hidden selection with multi tables.
• Support query datetime from diffs table.
• Implement LEFT, RIGHT, INNER and CROSS JOINS operation.
• Implement JOIN predicate using ON keyword.
• Simplifiy the DataProvider Design.
• Implement Bitwise xor operator.
• Change XOR operator to match postgresql.
• Implement ARRAY_SHUFFLE Array function.
• Implement ARRAY_POSITION Array Function.
• Implement ARRAY_DIMS Array Function.
• Support Infinity and NaN values.
• Support OUTER keyword.

• Fix passing global variable value to function call.
• Support slice with default start and end and optimize it.
• Implement PostgreSQL DISTINCT ON operator.
• Support GROUP BY one or more expression.
• Improve the parse and performance of DESCRIBE query.
• Support PostgreSQL boolean values literals.
• Support query parents_count of commit.
• Support query committer_name and committer_email of commit.
• Rename name and email to author_name and author_email of commit.
• Support commit_conventional function in gitql application.
• Support implicit casting in WHERE statement.
• Support implicit casting in HAVING statement.

• Fix resolving return type of function with Dynamic and depend on Variant types.
• Fix Projection check for symbols after select statement.

• Hot fix type checker if eval expression without table.

• Allow using column native name in condition after alias it
• Implement Slice expression for Collection [start : end].
• Implement Slice expression for Collection with optional start and end.
• Fix calling function without table name.
• Improve projection columns type checker

• Implement bit_and and bit_or Aggregation function.
• Implement Array literal and Index expression.
• Implement Index expression for Multi dimensions arrays.
• Implement Index expression and fix exception handling.
• Implement array_length Array function.
• Fix runtime exception handling.

Full Changelog: 0.20.0...0.21.0

• Make COUNT() aggregation argument to be Option<Any>.
• Replace lazy_static crate by std::sync::OnceLock.
• Migrate to gix 0.63.0.
• Fix hidden selection in group by statement.
• Implement GROUP_CONCAT Aggregation function.
• Catching function argument with undefined type.
• Update Regex expression implementation to not converted to call.
• Introduce gitql-core and gitql-std to allow dynamic std.
• Implement BIN Text function.
• Implement bool_and and bool_or aggregation functions.

Full Changelog: 0.19.1...0.20.0

• Fix Count aggregation function parameter type #101 .

• Improve the structure of the parser.
• Support string literal with single quotes.
• Improve the Type checker to allow mix of optional and varargs parameters.
• Implement UUID general function.
• Implement STR TExt function.