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After you select the transformation to apply, all relevant parameters can be configured through selection or type-ahead fields, so that you can choose from only the elements that are appropriate for the selected transformation.
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Tip: When you add, edit, or delete a recipe step, your changes to the recipe are automatically saved. |
To open the Transform Builder, begin creating a step through one of the following methods:
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- Parameters: Add a reference to a flow parameter in your transformation. See Manage Parameters Dialog.
- Metadata. You can insert special strings that evaluate to references of your dataset's metadata. For more information, see Source Metadata References.
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- Multiple: Select one or more discrete columns from the drop-down list.
- All: Select all columns in the dataset.
- Range: Specify a start column and ending column. All columns inclusive are selected.
Advanced: Specify the columns using a comma-separated list. You can combine multiple and range options under Advanced. Ranges of columns can be specified using the tilde (
~) character. Example:Code Block Store_Nbr, Item_Nbr, WM_Week~POS_Cost
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For some transforms, you can specify patterns to identify conditions or elements of the data on which to take action. These matching patterns can be specified using one of the following types.
| Pattern Type | Description | Example |
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| Literal value | An exact string or value. | The following matches on the exact value between the quotes: |
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| The following matches when two digits appear at the beginning of a value:
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| Regular expression pattern | Regular expressions are a standard method of describing matching patterns.
| The following matches on all numerical values from 0 to 99: /^\d$|^\d\d$/ |
For more information on pattern-based matching, see Text Matching.
Flow parameter: You can also insert a flow parameter into your pattern-based inputs in the Transform Builder. To reference a flow parameter, click the Parameterize icon above any field that accepts pattern-based inputs.
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Delimiter Groups
In the Transform Builder, transforms that require delimiter are organized into delimiter groups, so that you specify only the elements of a pattern that work together. Delimiter groups apply to the following transforms:
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Delimiter groups are listed below.
| Delimiter group | Description | |
|---|---|---|
| On delimiter | Transformation is applied based on a specific literal or pattern. | |
| Between delimiters | Transformation is applied on database between two literal or pattern-based delimiters. Details are below. | |
| On multiple delimiters | Transformation is applied based on a sequence of delimiters. An individual pattern can be a string literal,
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| Between positions | Transformation is applied based on a starting index position and an ending index position. Index positions start from 0 on the left side of any cell value. | |||
| On positions | Transformation is applied based on a sequence of listed index positions. Index positions start from 0 on the left side of any cell value. | |||
| At regular interval | Transformation is applied at every nth position. Index positions start from 0 on the left side of any cell value. |
For more information on the underlying syntax for delimiter groups, see Pattern Clause Position Matching.
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Each delimiter can either include or exclude the matching value:
| Transform Builder option | Include as part of transform | Include/Exclude |
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| Start delimiter | false | Excludes sub-pattern |
| Start delimiter | true | Includes sub-pattern |
| End delimiter | false | Excludes sub-pattern |
| End delimiter | true | Includes sub-pattern |
Condition
A condition is an expression that yields a true or false value. A condition may include all of the elements of a formula. This value determines whether the transformation is applied to the evaluated row.
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A number of transforms support the following parameters.
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Group parameter: For transforms that aggregate data, such as pivot or window, you can specify the column by which you wish to group the computed aggregations. In the following example, all values in the POS_Sales column are summed up for each value in the Store_Nbr column.
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sort transform. See Sort Transform.New Column Name parameter: For transforms that generate new columns, such as derive and extract, you can optionally specify the name of the new column, which saves adding a step to rename it. In the following example, the values of colA and colB are summed and written to the new column colC:...
After you have added a step, you can modify it as needed. In the Recipe panel, select the Pencil icon next to the recipe step. The step is displayed for editing in the Transform Builder.D s also
