Reshapes

Flatten

Explode one list-valued field into rows.

Flatten emits one row per element of a list-valued field while preserving the other fields.

Worked example

Flatten(
    name="one-click-per-row",
    input_spaces=("user-histories",),
    output_space="clicks",
    field="recent_history",
    key="click_id",
)

Parameter	Default	Meaning
`input_spaces`	required	The Space or Spaces read by the reshape.
`name`	required	A stable node name shown in the pipeline and session.
`output_space`	required	The Space receiving exploded rows.
`field`	required	The list-valued field to explode.
`key`	id	Name of the generated row-identity field.

Output

One row per list element. Scalar values pass through as one row.