getColumn
Return column by column name or column selector as DataColumn. Throws exception if requested column doesn't exist.
df.getColumn { age }
df.getColumn("age")
getColumnOrNull
Return top-level column by column name or column selector as DataColumn or null if requested column doesn't exist.
df.getColumnOrNull { age }
df.getColumnOrNull("age")
getColumnGroup
Return top-level column by column name or column selector as ColumnGroup. Throws exception if requested column doesn't exist or is not a ColumnGroup.
df.getColumnGroup { name }
df.getColumnGroup("name")
getColumns
Return list of selected columns.
df.getColumns { age and name }
df.getColumns("age", "name")
18 September 2025