> ## Documentation Index > Fetch the complete documentation index at: https://docs.maia.ai/llms.txt > Use this file to discover all available pages before exploring further. # Construct Struct export const ComponentMetadata = ({warehouses, unsupportedWarehouses = [], componentType, connectionInputs, connectionOutputs}) => { const allWarehouses = [...warehouses.map(w => ({ name: w, supported: true })), ...unsupportedWarehouses.map(w => ({ name: w, supported: false }))]; return

Project Availability	{allWarehouses.map((w, i) => {w.name} {w.supported ? '✅' : '❌'} )}
Component Type	{componentType}
Connection Inputs	{connectionInputs}
Connection Outputs	{connectionOutputs}

; }; The **Construct Struct** transformation component lets you create structured data from flat columns and output it into a new column. You map source columns to named target fields, and the component combines them into a BigQuery STRUCT type. ### Use case This component is useful when you need to group related flat columns into a single nested structure. For example, you can use it to: * Consolidate address fields such as street, city, and ZIP code into a single struct column. * Combine related metadata fields into a nested structure before loading data to a target system. *** ## Properties A human-readable name for the component. {/* */} Map source columns from the data flow to named target fields in the output struct. Click the field to open the **Column mappings** dialog. * **Source Column:** Select a source column from the data flow using the drop-down. * **Target Column:** Enter the name for the corresponding field in the output struct. Use the drag handles on the left of each row to reorder mappings. Select the checkbox next to a row to mark it for removal. * **Add all:** Click **Add all** to add all available source columns as mappings at once. * Click **+** to add a new empty mapping row. * Click **-** to remove the selected mapping rows. Toggle **Text mode** on at the bottom of the dialog to open a multi-line editor that lets you add items in a single block. For more information, read [Text mode](/docs/guides/components-overview#text-mode). To use grid variables, toggle **Use Grid Variable** on. For more information, read [Grid variables](/docs/guides/grid-variables). {/* */} The name of the new column that your structured data will populate.