compose static method
Implementation
@protected
static String compose(List<String> columns, FtsQ query) {
checkState(columns.isNotEmpty);
if (columns.length == 1) ////
return "${sqlIdentifier(columns.single)}: ${query.str}";
var joined = columns.map((var s) => sqlIdentifier(s)).join(" ");
return "{$joined}: ${query.str}";
}