Gene Pang created SPARK-48019:
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Summary: ColumnVectors with dictionaries and nulls are not
read/copied correctly
Key: SPARK-48019
URL: https://issues.apache.org/jira/browse/SPARK-48019
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.4.3
Reporter: Gene Pang
`ColumnVectors` have APIs like `getInts`, `getFloats` and so on. Those return a
primitive array with the contents of the vector. When the ColumnVector has a
dictionary, the values are decoded with the dictionary before filling in the
primitive array.
However, `ColumnVectors` can have `null`s, and for those `null` entries, the
dictionary id is irrelevant, and can also be invalid. The dictionary should not
be used for the `null` entries of the vector. Sometimes, this can cause an
`ArrayIndexOutOfBoundsException` .
In addition to the possible Exception, copying a `ColumnarArray` is not
correct. A `ColumnarArray` contains a `ColumnVector` so it can contain `null`
values. However, the `copy()` for primitive types does not take into account
the null-ness of the entries, and blindly copies all the primitive values. That
means the null entries get lost.
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