ColumnReturnType specifies the type of the column to return.
Enumeration value list
RETURN_ALL specifies to return all columns in the data table.
RETURN_SPECIFIED specifies to return only specified columns. In this case, you must specify the columns to return. You can specify any column in the data table or search index.
RETURN_NONE specifies to return only the primary key.
RETURN_ALL_FROM_INDEX specifies to return all columns in the search index.
enum ColumnReturnType {
RETURN_ALL = 1;
RETURN_SPECIFIED = 2;
RETURN_NONE = 3;
RETURN_ALL_FROM_INDEX = 4;
}