Do not try to uncompress pages that are not compressed #103
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Do not try to uncompress pages that are not compressed
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[This is a sync of a fix already done and tested in a fork]
Relates to #102
Context
Panther is running fraugster/parguet-go in production for some months now ingesting TBs of data.
Some customers reported that they got the following error:
After some investigation we can see that in the
readfunction of the the V2 DataPage, the flag (already present inDataPageHeaderV2) was not checked.More context: Parquet files - when compressed - are so in the page layer. Parquet supports compression per page, (as shown from the
DataPageHeaderV2IsCompressedfield, which comes directly from the thrift definition). The library detects the compression type (calledCompressionCodec) and passes that down to thenewBlockReaderlevel. However it still needs to check if that specific page is indeed compressed, and that was missing.Checks
FWIW, I doubled check this with parquet-go/parquet-goparquet-go/parquet-go and confirmed that they don't try to decompress that.
Ran all the tests with https://github.com/apache/parquet-testing
[Note: I can try adding a file into https://github.com/apache/parquet-testing before trying merging this into upstream]
Ran all unit tests with the race detector on
Added a unit tests
... that passes with false, but breaks if I do
IsCompressed=>truebecause the input is not snappy