* Reduce UT binary size
Almost every module depend on ExecEnv, and ExecEnv contains all
singleton, which make UT binary contains all object files.
This patch seperate ExecEnv's initial and destory to anthor file to
avoid other file's dependence. And status.cc include debug_util.h which
depend tuple.h tuple_row.h, and I move get_stack_trace() to
stack_util.cpp to reduce status.cc's dependence.
I add USE_RTTI=1 to build rocksdb to avoid linking librocksdb.a
Issue: #292
* Update
Currently, the cardinality, avgRowSize, numNodes stat info in OlapScanNode is none, So the broadcastCost and partitionCost are both wrong and Doris couldn't auto choose a best join strategy.
So we should make the statistical information in OlapScanNode more precise.
Allow User specify the null ordering
NULLS FIRST: specifies that NULL values should be returned before
non-NULL values.
NULLS LAST: specifies that NULL values should be returned after
non-NULL values.
* Change the lock type of Catalog lock
Implement a QueryableReentrantLock to see which thread held the lock.
* Key in empty version has no min/max value
It should be ignored to reconstruct min/max statistics upon restart.
1. Remove all design docs. They will be pushed again after modification.
2. Add streaming load and privilege help docs.
3. Rename palo*.py to doris*.py in gensrc/script/.
1. Fix error class in start_fe.sh and start_broker.sh.
2. Add log4j2.xml in fe/src/test/resources/ to run fe ut without log4j warnings.
3. Reduce the test file size in be ut.
* Add streaming load feature. You can execute 'help stream load;' to see more information.
Changed:
* Loading phase of a certain table can be parallelized, to reduce the load job execution time when multi load jobs to a single table.
* Using RocksDB to save the header info of tablets in Backends, to reduce the IO operations and increate speeding of restarting.
Fixed:
* A lot of bugs fixed.
