Querying multiple collections no longer supported after 15/09 maintenance

[stviaene-si]

Hi!

We regularly query HLS data on planetary computer, which is spread over 2 STAC collections. The code below worked before the maintenance on 15/09, but has stopped working since.

import datetime

import planetary_computer
import pystac_client.exceptions


if __name__ == "__main__":

    STAC_ENDPOINT = "https://planetarycomputer.microsoft.com/api/stac/v1"

    catalog = pystac_client.Client.open(
        STAC_ENDPOINT,
        modifier=planetary_computer.sign_inplace,
    )

    # Define search parameters
    bbox = (-120.0, 37.0, -119.0, 38.0)
    start_date = datetime.date(2024, 1, 1)
    end_date = datetime.date(2024, 1, 31)
    stac_collections = ["hls2-s30", "hls2-l30"]

    # Build datetime range
    start_time = datetime.datetime.combine(start_date, datetime.time.min)
    end_time = datetime.datetime.combine(end_date, datetime.time.max)

    search = catalog.search(
        collections=stac_collections,
        bbox=bbox,
        datetime=(start_time, end_time),
    )

    items = search.item_collection()

This now fails with:

pystac_client.exceptions.APIError: {"error":"Request must unambiguously select exactly one collection using supported STAC/CQL2 syntax."}

Our last production run that ran this successfully was on 7 Sept, 20:19:28.060 UTC. We first noticed this failing on 23 Sept, 11:23:12.616 UTC.

Given that the HLS collections are very closely related, it seems odd for a search to not allow querying both at the same time.