docs: function (column, table) {
              if (isString(column)) {
                  var parts = this._splitString(column);
                  var columnTable = parts[0], alias = parts[2], schema, tableAlias;
                  column = parts[1];
                  if (!columnTable) {
                      if (isInstanceOf(table, Identifier)) {
                          table = table.value;
                      }
                      if (isInstanceOf(table, AliasedExpression)) {
                          tableAlias = table.alias;
                      } else if (isInstanceOf(table, QualifiedIdentifier)) {
                          tableAlias = table;
                      } else {
                          parts = this._splitString(table);
                          schema = parts[0];
                          tableAlias = parts[2];
                          table = parts[1];
                          if (schema) {
                              tableAlias = new Identifier(tableAlias) || new QualifiedIdentifier(schema, table);
                          }
                      }
                      columnTable = tableAlias || table;
                  }
                  return new QualifiedIdentifier(columnTable, column);
              } else if (isInstanceOf(column, Identifier)) {
                  return column.qualify(table);
              } else {
                  return column;
              }
          }