GH-3715: Validate dictionary IDs while decoding - #3718
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Signed-off-by: Arnab Nandy <arnab_nandy7@yahoo.com>
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Rationale for this change
Dictionary-encoded data pages may contain an ID that exceeds the valid range of the associated dictionary. Currently, this causes an
ArrayIndexOutOfBoundsExceptionwhen the dictionary implementation accesses its backing array, obscuring the actual data corruption.What changes are included in this PR?
ParquetDecodingExceptionwhen an ID is outside the valid range.readValueDictionaryId().Are these changes tested?
Yes. A unit test constructs a dictionary-encoded page containing an out-of-range ID and verifies that reading it throws a descriptive
ParquetDecodingException../mvnw -pl parquet-column -Dtest=TestDictionary testAre there any user-facing changes?
Yes. Corrupt dictionary-encoded data now produces a descriptive
ParquetDecodingExceptioninstead of exposing an internalArrayIndexOutOfBoundsException. Valid Parquet files are unaffected.Closes #3715