XiaoHongbo-Hope opened a new pull request, #8830:
URL: https://github.com/apache/paimon/pull/8830
### Purpose
Reading a `VECTOR` column through the columnar path throws:
```
java.lang.ClassCastException: ...CastedVectorColumnVector cannot be cast to
...ArrayColumnVector
at ...VectorizedColumnBatch.getArray(VectorizedColumnBatch.java:125)
at ...ColumnarRow.getArray(ColumnarRow.java:169)
at ...FlinkRowData.getArray(FlinkRowData.java:137)
```
A `VECTOR` type is exposed as `ARRAY` at the engine boundary
(`DataTypeToLogicalType` maps `VectorType` to a Flink `ArrayType`), so engines
read the column via `getArray`. However the columnar read produces a
`VecColumnVector` (e.g. `CastedVectorColumnVector` /
`ReadableVectorColumnVector`), and `VectorizedColumnBatch.getArray`
unconditionally cast it to `ArrayColumnVector`, causing the
`ClassCastException`.
Since a vector is an array (`InternalVector extends InternalArray`), read a
`VecColumnVector` column through `getVector`. This mirrors the ARRAY-vs-VECTOR
branching that `ColumnarArray` and `RowToColumnConverter` already do.
### Tests
`ColumnarRowWithVectorTest#testVectorReadAsArray` — reads a VECTOR column
via `getArray`; fails with `ClassCastException` before the fix, passes after.
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