improve memory consumption in write
Merge branch 'master' into improve_mem_usage_in_write
add improved memory management in hadoop layer
handle case when value is bigger than slab size
adjust initial column size
more unit tests for CapacityByteArrayOutputStream
add constant and override annotations
check initial size
javadoc and constants
add constants and doc
Merge pull request #51 from Parquet/improve_mem_usage_in_write

improve memory consumption in write path