PARQUET-645: Fix null handling in DictionaryFilter. - #348
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This fixes how null is handled by `DictionaryFilter` for equals predicates. Null is never in the dictionary and is encoded by the definition level, so the `DictionaryFilter` would never find the value in the dictionary and would incorrectly filter row groups whenever the filter was `col == null`. Author: Ryan Blue <blue@apache.org> Closes apache#348 from rdblue/PARQUET-645-fix-null-dictionary-filter and squashes the following commits: ae8dd41 [Ryan Blue] PARQUET-645: Fix null handling in DictionaryFilter.
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This fixes how null is handled by `DictionaryFilter` for equals predicates. Null is never in the dictionary and is encoded by the definition level, so the `DictionaryFilter` would never find the value in the dictionary and would incorrectly filter row groups whenever the filter was `col == null`. Author: Ryan Blue <blue@apache.org> Closes apache#348 from rdblue/PARQUET-645-fix-null-dictionary-filter and squashes the following commits: ae8dd41 [Ryan Blue] PARQUET-645: Fix null handling in DictionaryFilter.
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This fixes how null is handled by
DictionaryFilterfor equals predicates. Null is never in the dictionary and is encoded by the definition level, so theDictionaryFilterwould never find the value in the dictionary and would incorrectly filter row groups whenever the filter wascol == null.