RowDescription constructor
https://deno.land/x/postgres@v0.17.0/query/query.ts?s=RowDescription#ctor_0
Implementation
external factory RowDescription(int columnCount, List<Column> columns);
https://deno.land/x/postgres@v0.17.0/query/query.ts?s=RowDescription#ctor_0
external factory RowDescription(int columnCount, List<Column> columns);