// read the dictionary blob
name = new StreamName(columnId,
OrcProto.Stream.Kind.DICTIONARY_DATA);
in = streams.get(name);
if (in.available() > 0) {
dictionaryBuffer = new DynamicByteArray(dictionaryOffsets[dictionarySize],
DUMMY_MEMORY_ESTIMATE);
dictionaryBuffer.readAll(in);
} else {
dictionaryBuffer = null;