Backend crash due to PANIC causes postmaster ServerLoop to shutdown all
subprocesses and then restart them.  During 8.3 merge, the condition to restart
was weakened, causing ServerLoop to incorrectly initiate restart of
subprocesses before all existing subprocesses are shutdown.  This led to an
infinite loop in the event of PANIC.

Paired effort with Amil Khanzada <akhanzada@pivotal.io>

Greenplum has limited trigger capabilities which do not work with the current AO
implementation. It was found that after row triggers were being executed for AO
table DMLs using planner resulting in erroneous heap reads. Instead of adding
logic to do AO segfile reads, we disable after row triggers for AO tables as
Greenplum does not really support triggers for AO anyways. The issue with heap
tables started after the 8.3 merge which introduced LockBuffer usage at the
bottom of the GetTupleForTrigger function. LockBuffer assumes that a
MIRROREDLOCK_BUFMGR_LOCK is held so we just needed to release the
MIRROREDLOCK_BUFMGR_LOCK after the buffer lock is released.

1. Enable C++0x features in gcc.
2. Replace ChunkBuffer::chunkData with vector<uint8_t>. Remove init()
   and destroy().
3. Modify S3Service::fetchData, move buffer from Response object
   to data.
4. Modify S3Service::getXMLContext, use reference to avoid copy.
5. Fix unit tests in s3key_reader_test.
Signed-off-by: NPeifeng Qiu <pqiu@pivotal.io>

Any GPDB exception happens in while ORCA generating plan will abort
query.
Signed-off-by: NFoyzur Rahman <frahman@gmail.com>

* Fix Debian Vagrant file

Add more required packages
Fix upgraded Python packages
Add missing options to configure line
Fix ssh known hosts

* Fix ImportError with cffi and setuptools_ext

* latest changes from Dave

This closes #874

Signed-off-by: NKarthikeyan Jambu Rajaraman <karthi.jrk@gmail.com>

Verify that input expression is of type VAR <= CONST
Codegen expression evaluation
Fix wrong return value type
Support constants and variables of Date type
Add comments and fix code style

This reverts commit aae0ad3d.

Replace RegisterExternalFunction with GetOrRegisterExternalFunction using an unordered_map in codegen_utils

* Derive GpCodegenUtils from CodegenUtils for GPDB specific utilities.
* Move ElogWrapper functions to GpCodegenUtils
* Implement GetOrRegisterExternalFunction

* The user can now update the DDBOOST_CONFIG storage unit,
  which needs to be reflected on the help file.

Root cause: DecompressReader requests data from upstream reader, which
might return a very small amount of data, zlib inflate() may not be able
to decompress it.

Fix: fill zlib's chunk as possible as it could.

Test case: DecompressReaderTest.AbleToDecompressFragmentalCompressedData

Also refactor DecompressReader::read().
Signed-off-by: NPeifeng Qiu <pqiu@pivotal.io>
Signed-off-by: NAdam Lee <ali@pivotal.io>

The functions GetPartitionTargetlist() and UpdateGenericExprState()
are not called from anywhere so remove.

of meaningless code.

The correct name is gp_set_proc_affinity, not gp_proc_affinity.
Spotted by Alexey Grishchenko.

Close #883

in new added code.

and 42cab821, since new PANIC
issues are found related to them.