After checking, I found that broker load in 0.11 added num_of_columns_from_file parameter in thrift. This parameter does not consider compatibility in BE.
So broker load could cause BE crashed during the upgrade
Currently, we do not support parsing encoded/compressed columns in file path, eg: extract column k1 from file path /path/to/dir/k1=1/xxx.csv
This patch is able to parse columns from file path like in Spark(Partition Discovery).
This patch parse partition columns at BrokerScanNode.java and save parsing result of each file path as a property of TBrokerRangeDesc, then the broker reader of BE can read the value of specified partition column.
