1. reserve `SegmentWriter::_column_writers` before writing it 2. remove some condition branchs in SegmentWriter::init 3. fix hard-coded library names in build-thirdpary.sh
1. reserve `SegmentWriter::_column_writers` before writing it 2. remove some condition branchs in SegmentWriter::init 3. fix hard-coded library names in build-thirdpary.sh