Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14803
>
* If the partition directories are not present when the stream starts
then I believe this breaks.
Yes. Schema inference only happens when starting the stream.
>
* I think that for all but text you have to include the partition columns
in the schema if inference is turned off (which it is by default).
I will update this to the programming guide.
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