compileHavings method
Compile the "having" portion of the query.
Implementation
String compileHavings(List<Map<String, dynamic>> havings) {
if (havings.isEmpty) return '';
final sql = havings.map((having) {
final column = wrap(having['column']);
final operator = having['operator'];
return '$column $operator ?';
}).join(' AND ');
return 'HAVING $sql';
}