internal Visitor(bool doLifting, HashSet<SqlAlias> aliasesForLifting, HashSet<SqlExpression> liftedExpressions) {
this.doLifting = doLifting;
this.aliases = new SqlAliasesReferenced(aliasesForLifting);
this.referencedColumns = new HashSet<SqlColumn>();
this.liftedExpressions = liftedExpressions;
this.canLiftAll = true;
if (doLifting)
this.lifted = new List<List<SqlColumn>>();
this.aggregateChecker = new SqlAggregateChecker();
}
internal Visitor(SqlAliasesReferenced parent) {
this.parent = parent;
}
