flatten
Edit page Last modified: 14 January 2025Returns DataFrame without column groupings under selected columns.
flatten [ { columns } ]Columns after flattening will keep their original names. Potential column name clashes are resolved by adding minimal possible name prefix from ancestor columns.
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// name.firstName -> firstName
// name.lastName -> lastName
df.flatten { name }val name by columnGroup()
val firstName by name.column<String>()
val lastName by name.column<String>()
// name.firstName -> firstName
// name.lastName -> lastName
df.flatten(name)// name.firstName -> firstName
// name.lastName -> lastName
df.flatten("name")To remove all column groupings in DataFrame, invoke flatten without parameters:
df.flatten()