/// <summary>
/// Initializes a new instance of the <see cref="QueryExpr{T}"/> class.
/// </summary>
/// <param name="query">The expression.</param>
public QueryExpr(QueryExpr query)
{
_expr = query;
}
/// <summary>
/// Initializes a new instance of the <see cref="ParallelQueryExpr{T}"/> class.
/// </summary>
/// <param name="query">The expression.</param>
public ParallelQueryExpr(QueryExpr query)
{
_expr = query;
}
/// <summary>
/// Initializes a new instance of the <see cref="QueryExprVoid"/> class.
/// </summary>
/// <param name="query">The expression.</param>
public QueryExprVoid(QueryExpr query)
{
_expr = query;
}