BigQuery - UNNEST with a multidimensional array - sql

Question

I am needing to unnest a multidimensional array with multiple items.
My data looks like this (two rows):
Each order in this table has a fulfillments column which is a multidimensional array.
fulfilments has multiple line_items. Some orders only have 1 line_items, some orders have multiple line_items.
My goal is to get each product name and the quantity from each line_items and do a running sum/tally.
Here's a JSON export of the fulfillments column data:
"{
"fulfillments": [{
"value": {
"id": "6575674745",
"tracking_number": null,
"line_items": [{
"value": {
"properties": [{
"value": {
"name": "shipping_interval_unit_type",
"value": "Months"
}
}, {
"value": {
"name": "shipping_interval_frequency",
"value": "1"
}
}, {
"value": {
"name": "ch_item_id",
"value": "77321530"
}
}],
"product_id": "4790985097351",
"total_discount_set": {
"shop_money": {
"amount": "0.00",
"currency_code": "USD"
},
"presentment_money": {
"amount": "0.00",
"currency_code": "USD"
}
},
"sku": “10101”,
"name": “Product1”,
"variant_id": "33433213108359",
"quantity": "1",
"taxable": "true",
"total_discount": "0",
"title": "Product1 Title",
"price_set": {
"shop_money": {
"amount": "12.00",
"currency_code": "USD"
},
"presentment_money": {
"amount": "12.00",
"currency_code": "USD"
}
},
"product_exists": "true"
}
}],
"service": "manual",
"tracking_urls": []
}
}, {
"value": {
"tracking_url": null,
"id": "3555531128967",
"tracking_company": null,
"tracking_number": null,
"name": "#3129472402.2",
"tracking_numbers": [],
"line_items": [{
"value": {
"properties": [{
"value": {
"name": "shipping_interval_frequency",
"value": "1"
}
}, {
"value": {
"name": "shipping_interval_unit_type",
"value": "Months"
}
}, {
"value": {
"name": "ch_item_id",
"value": "77321529"
}
}],
"product_id": "5216409780359",
"total_discount_set": {
"shop_money": {
"amount": "0.00",
"currency_code": "USD"
},
"presentment_money": {
"amount": "0.00",
"currency_code": "USD"
}
},
"sku": "9005",
"name": “Product2”,
"quantity": "1",
"title": “Product2 Title”,
"price_set": {
"shop_money": {
"amount": "0.00",
"currency_code": "USD"
},
"presentment_money": {
"amount": "0.00",
"currency_code": "USD"
}
},
"product_exists": "true"
}
}],
"service": "manual",
"tracking_urls": []
}
}]
}"
SELECT
fulfillments[ safe_OFFSET (0)].value.line_items[ safe_OFFSET (0)].value.name AS name,
fulfillments[ safe_OFFSET (0)].value.line_items[ safe_OFFSET (0)].value.quantity AS quantity
FROM
`mydatabase`
isn't ideal in the event the order has more than one array in line_items
How can I unnest a multidimensional array when I don't know how large each array is?
SELECT
*
FROM
`mydatabase`,
UNNEST(fulfillments) as a
Only gives me another array to flatten

Answer 1

Given your scenario, you may try to use this query to unnest line_items with product name and the quantity:
SELECT
line_items.value.name,
line_items.value.quantity,
line_items.value.product_id
from `mydatabase`,
unnest(fulfillments) fulfillments,
unnest(fulfillments.value.line_items) line_items
Output: