0.6.0

• Support << and >> overflow.
• Fix reporting error with out of index position.
• Implement Case expression.
• Support bang equal != for comparisons.
• Improve error message for unexpected token.
• Support negative numbers.
• Add repository path as a field for data all tables.
• Make function name case-insensitive.
• Support Text reverse function.
• Support Text replicate function.
• Support Text ltrim, rtrim function.
• Select the same field twice.
• Optimize engine to work on one repo only if table name is empty.
• Fix merging empty groups.
• Add custom error message for invalid use of asc and desc.
• Fix resolving symbols.
• Fix name alias for non symbols.
• Fix name alias for aggregation function.
• Use aggregation function after select statement.
• Don't allow using aggregation in where statement.
• Fix hidden selections.
• Alias the same name twice
• Fix evaluate function before argument