FromColumns / Struct Layer

Combine multiple columns into a single struct column. Similar to pandas DataFrame.to_dict() or R's list construction.

Example transformation:

Input columns:

name	age	city
John	30	NYC
Mary	25	LA

After combining into struct:

user_info
{name: 'John', age: 30, city: 'NYC'}
{name: 'Mary', age: 25, city: 'LA'}

Common applications:

Creating nested data structures
Preparing data for JSON serialization
Grouping related columns
Building complex data types
Organizing hierarchical data

Note: Field names in the struct will match the original column names. The operation preserves the original data types within the struct.

Table

Column

[, ...]

List of columns to combine into the struct. Order is preserved in the resulting struct. Example combinations:

['name', 'age', 'city'] for user info
['latitude', 'longitude'] for location
['start_time', 'end_time'] for time range

Must specify at least one column.

Select

column

Column to include in the struct. The column name becomes the field name in the resulting struct. Examples:

'name' becomes {name: value}
'user_id' becomes {user_id: value}
'timestamp' becomes {timestamp: value}

Name for the new column. If not provided, the system generates a unique name. If AsColumn matches an existing column, the existing column is replaced. The name should follow valid column naming conventions.