GH-47981: [C++][Parquet] Add compatibility with non-compliant RLE stream #47992
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Rationale for this change
RLE-bit-packed streams are required by the Parquet spec to have 8-padded bit-packed runs, but some non-compliant encoders (such as the extremely old Impala 1.1.1) might generated a truncated last bit-packed run, which nevertheless contains enough logical values.
What changes are included in this PR?
DictionaryConverterAre these changes tested?
Not yet, need to add a unit test.
Are there any user-facing changes?
Just a bugfix for an improbable situation.
pyarrow.lib.ArrowInvalid: Invalid number of indices: 0when reading a parquet file #47981