steven-aerts opened a new pull request #33191:
URL: https://github.com/apache/spark/pull/33191
this commit makes sure that for File Source V2 partition filters are
also taken into account when the readDataSchema is empty.
This is the case for queries like:
SELECT count(*) FROM tbl WHERE partition=foo
SELECT input_file_name() FROM tbl WHERE partition=foo
### What changes were proposed in this pull request?
As described in SPARK-35985 there is bug in the File Datasource V2 which
prevents it to push down to the FileScanner for queries like the ones listed
above.
### Why are the changes needed?
If partitions filters are not pushed down, the whole dataset will be scanned
while only one partition is interesting.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
An extra test was added which relies on the output of explain, as is done in
other places.
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