/// <summary>
/// 初始化 <see cref="ColumnExpressionVisitor"/> 类的新实例
/// </summary>
public ColumnExpressionVisitor(IDbQueryProvider provider, TableAliasCache aliases, IDbQueryableInfo_Select qQuery)
: base(provider, aliases, qQuery.Select.Expressions != null ? qQuery.Select.Expressions[0] : null)
{
_provider = provider;
_aliases = aliases;
_qQuery = qQuery;
_groupBy = qQuery.GroupBy;
_include = qQuery.Includes;
if (_pickColumns == null)
{
_pickColumns = new ColumnCollection();
}
_navigations = new NavigationCollection();
_navChainHopper = new List <string>(10);
}
