v0.14.0

FunSQL v0.14.0

Diff since v0.13.2

• Define: add parameters before and after for specifying position of the defined columns.
• Introduce the SQLColumn type to represent table columns. The type of SQLTable.columns is changed from Vector{Symbol} to OrderedDict{Symbol, SQLColumn}.
• Make SQLTable an AbstractDict{Symbol, SQLColumn}.
• Add DataAPI-compatible metadata to catalog objects SQLCatalog, SQLTable, and SQLColumn.
• Add a field SQLString.columns with an optional Vector{SQLColumn} representing output columns of the SQL query.
• Support docstrings in @funsql notation.
• Remove support for const and variable assignment syntax from @funsql notation.
• Use a simpler and more consistent rule for collapsing JOIN branches (fixes #60).

Merged pull requests:

• Define: add 'before' and 'after' parameters (#62) (@xitology)
• Support docstrings in @funsql notation (#63) (@xitology)
• Metadata interface for catalog objects (#64) (@xitology)

Closed issues:

• Adding multiple qualifiers to table results in joins being subqueries (#60)