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Release 8.2.2



NOTE: Transforms are a part of the underlying language, which is not directly accessible to users. This content is maintained for reference purposes only. For more information on the user-accessible equivalent to transforms, see Transformation Reference.

In Wrangle, a transform is an action applied to your dataset. Each step of your recipe corresponds to a fully specified transform.

Tip: To see transforms by category, click the sort buttons in the Category header in the online documentation.

Case TransformOtherPerform if/then/else or case logic on the rows in your dataset.
Comment TransformOtherInserts a non-functional comment as a recipe step.
Countpattern TransformSearch and ReplaceCounts the number of instances of a specified pattern in a column and writes that value into a newly generated column. Source column is unchanged.
Deduplicate TransformManage RowsRemoves exact duplicate rows from your dataset. Duplicate rows are identified by exact matches between values. For example, two strings with different capitalization do not match.
Delete TransformManage RowsDeletes a set of rows in your dataset, based on a condition specified in the row expression. If the conditional expression is true, then the row is deleted.
Derive TransformManage ColumnsGenerate a new column where the values are the output of the value expression. Expression can be calculated based on values specified in the group parameter. Output column can be named as needed.
Drop TransformManage ColumnsRemoves the specified column or columns permanently from your dataset.
Extract TransformSearch and ReplaceExtracts a subset of data from one column and inserts it into a new column, based on a specified string or pattern. The source column in unmodified.
Extractkv TransformSearch and Replace

Extracts key-value pairs from a source column and writes them to a new column. Source column must be of String type, although the data can be formatted as other data types.

Extractlist TransformSearch and ReplaceExtracts a set of values based on a specified pattern from a source column of any data type. The generated column contains an array of occurrences of the specified pattern. While the new column contains array data, the data type of the new column is sometimes inferred as String.
Filter TransformManage RowsKeep or delete rows in your dataset based on a defined type of filter.
Flatten TransformNested DataUnpacks array data into separate rows for each value.
Header TransformInitial ParsingUses one row from the dataset sample as the header row for the table. Each value in this row becomes the name of the column in which it is located.
Keep TransformManage RowsRetains a set of rows in your dataset, which are specified by the conditional in the row expression. All other rows are removed from the dataset.
Merge TransformManage ColumnsMerges two or more columns in your dataset to create a new column of String type. Optionally, you can insert a delimiter between the merged values.
Move TransformManage ColumnsMoves the specified column or columns before or after another column in your dataset.
Nest TransformNested DataCreates an Object or Array of values using column names and their values as key-value pairs for one or more columns. Generated column type is determined by the into parameter.
Pivot TransformNested Data

The pivot transform can be used to aggregate or pivot your data into columns and aggregate the results. Reshape your dataset into summary information.

When you aggregate data, calculations are performed on column values, which are then grouped and ordered based on specified parameters.

When you pivot data, the values of a selected column become new columns in the dataset, each of which contains a summary calculation that you specify. This calculation can be based on all rows for totals across the dataset or based on group of rows you define in the transform.

Rename TransformManage ColumnsRenames one or more columns to specified names or append or prepend column names with specific values.
Replace TransformSearch and ReplaceReplaces values within the specified column or columns based on the string literal, pattern, or location within the cell value, as specified in the transform.
Set TransformSearch and ReplaceReplaces all values in the specified column with the specified value, which can be a literal or an expression. You can specify an optional row: parameter, containing a conditional test to identify the rows where the replacement is to be made within the column.
Settype TransformManage ColumnsSets the data type of the specified column. This transform does not modify the source values. The data in the column is re-inferred against the specified data type, which can change the results of column profiling.
Split TransformInitial ParsingSplits the specified column into separate columns of data based on the delimiters in the transform. Delimiters can be specified in a number of methods described below.
Splitrows TransformInitial ParsingSplits a column of values into separate rows of data based on the specified delimiter. You can split rows only on String literal values. Pattern-based row splitting is not supported.
Unnest TransformNested Data

Unpacks nested data from an Array or Object column to create new rows or columns based on the keys in the source data. This transform works differently on columns of Object or Array type.

Unpivot TransformNested DataReshapes the layout of data by merging one or more columns into key and value columns. Keys are the names of input columns, and the values are the cell values from the source columns. Rows of data are duplicated, once for each input column.
Valuestocols TransformManage ColumnsFor each unique value in a column, a separate column is created. For each row that contains the value in the source column, an indicator value is inserted in the new column. This value can be a literal value or the output of a function. If no indicator value is generated, a null value is written.
Window TransformAggregationThe window transform enables you to perform summations and calculations based on a rolling window of data relative to the current row. For example, you can compute the rolling average for a specified column for the current row value and the nine preceding rows. This transform is particularly useful for processing time or otherwise sequential data.

Other Transforms:

Sort TransformManage RowsSorts the dataset based on one or more columns in ascending or descending order. You can also sort based on the order of rows when the dataset was created.

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