Snowflake Get MIN/MAX values from Nested JSON - json

Question

I have the following sample structure in snowflake column, indicating a series of coordinates for a map polygon. Each pair of values is formed of "longitude, latitude" like this:
COLUMN ZONE
{
"coordinates": [
[
[
-58.467372,
-34.557908
],
[
-58.457565,
-34.569341
],
[
-58.446836,
-34.573511
],
[
-58.43482,
-34.553367
],
[
-58.441944,
-34.547923
]
]
],
"type": "POLYGON"
}
I need to get the smallest longitud and the smallest latitude and the biggest longitud and latitude for every table row.
So, for this example, I need to get something like:
MIN: -58.467372,-34.573511
MAX: -58.43482,-34.547923
Do you guys know if this is possible using a query?
I got as far as to navigate the json to get the sets of coordinates, but I'm not sure how to proceed from there. I tried doing a MIN to the coordinates column, but I'm not sure how to reference only the "latitude" or "longitude" value.
This obviously doesn't work:
MIN(ZONE['coordinates'][0])
Any suggestions?

Answer 1

You can do this with some Snowflake GIS functions, and massaging the input data for an easier parsing:
with data as (
select '
{
"coordinates": [
[
[
-58.467372,
-34.557908
],
[
-58.457565,
-34.569341
],
[
-58.446836,
-34.573511
],
[
-58.43482,
-34.553367
],
[
-58.441944,
-34.547923
]
]
],
"type": "POLYGON"
}
' x
)
select st_xmin(g), st_xmax(g), st_ymin(g), st_ymax(g)
from (
select to_geography(replace(x, 'POLYGON', 'MultiLineString')) g
from data
)