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Would it be possible to return empty rows for failing requests? #148

@onnimonni

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@onnimonni

Hey,

I find myself writing often something like this:

FROM read_json([
  'http://example.com/data.json',
  'http://non-existent.test/data.json'
]);

or

FROM read_json(getvariable('resource_urls'));

or

FROM read_text(getvariable('resource_urls'));

If there are hundreds of URLs every now and then some of the resources will returns errors like these:

Could not establish connection error for HTTP HEAD to 'http://non-existent.test/data.json'
Unable to connect to URL "http://example.com/data.json": 404 (Not Found).

In this situation all other results will go to waste if 1 url from 300 urls will fail.

There are already excellent configs I can use to increase the retry count and wait times:

SET http_retries = 10;
SET http_retry_wait_ms = 2000;

Sometimes it's not enough to retry and the resource is not there for a hour or a day or for a week or for a month but will eventually appear again.

Would there be a way to allow missing or failing resource in the larger arrays and still be able to load all other files?

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