GQL

• Implement Cast function call expression CAST(expr AS <Type>).
• Implement Cast operator expr::<type>.
• Created the TypesTable component to register types and aliases.
• Fix schema datetime and updated types from Date to DateTime.
• Fix consuming table name twice.

• Implement Composite type.
• Implement Member access expression for Composite type.
• Replace atty with std is_terminal.
• Improve order of iterating over composite type members.
• Fix comparions operators for String, Date, Time and DateTime

• Implement Dynamic type system.
• Implement new Dynamic values system.
• Improve the output printer implementation.
• Change the analysis format to be similar to popular engines.
• Implement benchmark function.
• Implement Bitwise XOR operator for integers.
• Implement Contained By expression using <@ operator.
• Speedup order by statement by using pre eval map.
• Support multi lines and unicode in LIKE and REGEX expressions.
• Improve error message for invalid column name.
• Improve safety check for std or aggregation signature.
• Migrate to Gix 0.67.0.
• Integrate with LineEditor.

• Enable LTO (Link time optimization).
• Optimize set alias for selected expression.
• Handle groups rows elemenations in case group by don't create extra groups #117.
• Implement contains operator for Range in other Range.
• Implement IF, IFNULL general functions.
• Implement ARRAT_POSITIONS, TRIM_ARRAY array functions.
• Implement ISEMPTY range function.
• Implement WITH ROLLUP feature.
• Implement ORDER BY ... USING <operator> feature.
• Implement Overlap operator for Arrays and Ranges.
• Remove hidden selection information from the render.
• Handle WITH ROLLUP edge case for using one column only in grouping.
• Improve classifying columns on tables.

• Improve comparing Arrays values.
• Support Range data types.
• Implement int4range range function.
• Implement daterange range function.
• Implement tsrange range function.
• Simplify the dynamic types helper functions.
• Implement ARRAY_PREPEND function.
• Implement ARRAY_REMOVE function.
• Implement ARRAY_APPEND Array function.
• Implement ARRAY_REPLACE Array function.
• Update ARRAT_POSITION signature.
• Organize the std functions registers.
• Implement BIT_XOR Aggregation function.
• Implement ARRAY_AGG Aggregation function.
• Improve the type checker to resolve dynamic types in arguments.
• Implement Contains operator @&g

• 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.

• 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