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.

Create GpcodegenBuild, GporcaBuild and GporcacodegenBuild builds to
support building GPDB with codegen, orca, and orca_and_codegen.

    When we execute an ALTER TABLE statement that splits default partition into a "New" and a new Default partition, we perform the following 5 steps:

     * copy the tuples located in the default partition into a temporary table,
     * drop default partition,
     * create the “New“ partition,
     * create the new DEFAULT partition, and
     * copy all tuples from the temporary table into the newly created partitions.

    The last step is executed in split_rows, where for each tuple in the temporary table,

     * we determine the target partition/table,
     * construct the slot of the target table (if is NULL), and
     * store the tuple into the target table.

    Currently, we allocate the tuple table slot of the target table into a per-tuple memory context. If the size of that memory context exceeds 50KB, then we reset it. This will cause issues, since it will free target table's slot and at the next iteration (copy the next tuple) we will try to access the attributes of a freed (and not NULL) slot. In addition, the target table slot lifespan is much longer than an individual tuple. So it is not correct to allocate the slot in a per-tuple memory context.

    To solve this issue, we allocate target's tuple table slot in PortalHeapMemory. This is the CurrentMemoryContext that is used in split_rows before we start copying tuples. PortalHeapMemory is used already for storing the tuple table slot of the temporary table and the ResultRelInfo of the target tables. PortalHeapMemory is not freed while we copy tuples. After copying all tuples to the new partitions, we drop target tables' slots.
Signed-off-by: NNikos Armenatzoglou <nikos.armenatzoglou@gmail.com>

* Add section to readme with info on how to consume docker image
* Docker image automatically starts demo cluster and sources relevant env files

1. add global error message variable to report to gpdb console.
2. add try/catch block around fetchData() call to catch error message.
3. refactor shared error mechanism between ChunkBuffers.
4. fix unit tests.

Also fixed a memleak thanks to Kuien.
Signed-off-by: NHaozhou Wang <hawang@pivotal.io>
Signed-off-by: NKuien Liu <kliu@pivotal.io>

Using new GPReader, and make it clean.
Signed-off-by: NKuien Liu <kliu@pivotal.io>

1. add s3common_reader to detect the format of file
   if the file is compressed call decompressReader
   otherwise call S3KeyReader directly.
2. add checkCompressionType() into S3Interface.
3. fix a bug if the file size is less than S3_MAGIC_BYTES_NUM
   and add a unit test
4. fix a bug if chunkSize is zero.
5. add unit tests
6. rename uncompress* to decompress*
Signed-off-by: NHaozhou Wang <hawang@pivotal.io>

Two major problems this commit fixes:
credential should be copied to keep the data.
keyReader must be reset before every new file downloading.
Signed-off-by: NKuien Liu <kliu@pivotal.io>

The clang in mac does not check the -std=c++98 flag strictly.
Hence when compiling on the other platform like redhat 7 (using gcc),
the source code may not be compiled correctly. The compiling errors have
been fixed and the tests have been passed on redhat7 using c++98.

1. std::vector<T>::shrink_to_fit is added in C++11.
2. need to include <stdexcept> to use std::runtime_error.
3. In C++98, if a class has reference member, then it can't be copy assigned by default,
   we need to implement operator= explicitly.
4. stoi is added in C++11.
Signed-off-by: NHaozhou Wang <hawang@pivotal.io>