Github user vdiravka commented on the issue:
https://github.com/apache/drill/pull/877
@paul-rogers could you please review additional commit. The main changes:
1. All IOExceptions are ignored while deserializing metadata cache files
(JsonMappingException, JsonParseException...) with appropriate logging. To
avoid of reading such corrupted or unsupported file again that status is stored
in metadata context.
2. Creating the metadata context while expanding Selection from Metadata
Cache (if it is `null`) allows to always detect the status of partition punning.
3. Two new test cases are added: `testCorruptedMetadataFile()` and
`testFutureUnsupportedMetadataVersion()`.
4. Test data created in `@BeforeClass` in `TestParquetMetadataCache` will
be removed after executing all tests.
5. For `testMetadataCacheAbsolutePaths()` and
`testSpacesInMetadataCachePath()` tests `testPlanMatchingPatterns()` is added.
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