If both master and standby master are set in the same
node, the gppkg utility will report error when uninstall a gppkg.
This is because, gppkg utility assume master and standby master
are in the different node, which is not be true in test environment.

This patch fixed this issue, when master and standby master are in
the same node, we skip to install/uninstall gppkg on standby master
node.

The code was added to tackle the case when FTS sends promote message, on mirror create the PROMOTE file and signal mirror to promote. But while mirror is still under promotion and not completed yet, FTS sends promote again, which creates the PROMOTE file again. Now, this PROMOTE file exist on promoted mirror which is acting as primary.
So, if basebackup was taken from this primary to create mirror, it included PROMOTE file and auto promoted mirror on creation which is incorrect. Hence, via FTS to detect if this file exist delete PROMOTE file was added along with pg_basebackup excluding the copy of PROMOTE file.

Now, given that background and upstream commit to always just delete the PROMOTE file on postmaster start, covers for even if PROMOTE file gets created after mirror promotion and gets copied over by pg_basebackup. On mirror startup no risk of auto-promotion. So, we can safely remove this code now.
Co-authored-by: NAshwin Agrawal <aagrawal@pivotal.io>
Reviewed-by: NPaul Guo <pguo@pivotal.io>

Function largest_child_relation() is used to find the largest child
relation for an inherited/partitioned relation, recursively. Previously
we passed a wrong rel as its param.

This patch finds in root->simple_rel_array the right rel for
largest_child_relation(). Also it replaces several rt_fetch with a
search in root->simple_rte_array.

This patch fixes #6599.
Co-authored-by: NMelanie Plageman <mplageman@pivotal.io>
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>

* docs - reorg pxf content, add multi-server, objstore content

* misc edits, SERVER not optional

* add server, remove creds from examples

* address comments from alexd

* most edits requested by david

* add Minio to table column name

* edits from review with pxf team (start)

* clear text credentials, reorg objstore cfg page

* remove steps with XXX placeholder

* add MapR to supported hadoop distro list

* more objstore config updates

* address objstore comments from alex

* one parquet data type mapping table, misc edits

* misc edits from david

* add mapr hadoop config step, misc edits

* fix formatting

* clarify copying libs for MapR

* fix pxf links on CREATE EXTERNAL TABLE page

* misc edits

* mapr paths may differ based on version in use

* misc edits, use full topic name

* update OSS book for pxf subnav restructure

This commit addresses a race condition where it was possible that during
xlogstream the pg_xlog directory went missing. The race exists only with
--foceoverwrite and --xlog stream. In stream mode pg_basebackup forks a
process to populate pg_xlog directory with new transaction files and
another process to receive and untar base directory contents. Force
overwrite removes an existing pg_xlog directory before copying contents
from tar file. It is problematic if untar process deletes xlog directory
while stream process tries to write to it.

In order to avoid this situation in forceoverwrite mode, the deletion
of pg_xlog now happens before starting stream and untar processes. This
enables untar process to skip deletion of pg_xlog.
Co-authored-by: NAshwin Agrawal <aagrawal@pivotal.io>

Use the CStringGetTextDatum() construct when generating the reloptions
array in order to improve readability. This patch started out by trying
to remove duplication in calculating the string length but turned into
a refactoring of the Datum creation instead.
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>

Running ANALYZE with the HLL computation produce a lot of LOG messages
which are more geared towards troubleshooting than general purpose log
files. Fold these under ANALYZE VERBOSE to avoid cluttering up logfiles
on production systems unless explicitly asked for.
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>

- Added with-quicklz configure flag
- Added quicklz gpcontrib directory with C wrapper functions and SQL installation file
- Added simple quicklz functional tests
- Added #undef HAVE_LIBQUICKLZ to pg_config.h.win32.
  This is to parallel the recent change in pg_config.h.in that adds
  quicklz. pg_config.h.win32 should be autogenerated, but isn't in
  practice.
Co-authored-by: NJimmy Yih <jyih@pivotal.io>
Co-authored-by: NBen Christel <bchristel@pivotal.io>
Co-authored-by: NDavid Sharp <dsharp@pivotal.io>

For GPDB 6 Beta centos 6/7 need to be passing for the same commit
to be a valid release candidate.
Co-authored-by: NKris Macoskey <kmacoskey@pivotal.io>

The GPDB-specific constant PQPING_MIRROR_READY, which indicates that a
mirror is ready for replication, was not handled in pg_isready.

Additionally, the value we selected for PQPING_MIRROR_READY might at one
point in the future conflict with upstream libpq, which would be a pain
to untangle. Try to avoid that situation by increasing the value.
Co-authored-by: NShoaib Lari <slari@pivotal.io>

There was a race condition where it was possible that fault was
unexpectedly triggered by WAL sender object independent of
pg_basebackup being run. We could fix it to be more deternimistic by
incrementing wait for triggered count, but the test as a whole didn't
seem to add much value.
Co-authored-by: NEkta Khanna <ekhanna@pivotal.io>

Prior to this commit, the test recreated the tmp_check_* directory for
each running test. This would lead to loosing the datadir for the
failing test if it wasn't the last one. This commit, creates a new
directory specific to each test and cleans up artifacts of previous
passing tests
Co-authored-by: NDavid Kimura <dkimura@pivotal.io>
Co-authored-by: NEkta Khanna <ekhanna@pivotal.io>

Co-authored-by: NChris Hajas <chajas@pivotal.io>

This commit sets the default value of the guc optimizer_penalize_broadcast_threshold
to 100000. We have seen a lot of cases where a plan with broadcast was chosen
due to underestimation of  cardinality. In such cases a Redistribute motion
would have been better. So this commit will penalize broadcast when the number
of rows is greater than 100000 so that Redistribute is favored more in this
case. We have tested the change on the perf pipeline and do not see any
regression.
Co-authored-by: NChris Hajas <chajas@pivotal.io>

I looked up this issue in the old JIRA instance:

> MPP-8014: bitmap indexes create entries in gp_distribution_policy
>
> postgres=# \d bar
>       Table "public.bar"
>  Column |  Type   | Modifiers
> --------+---------+-----------
>  i      | integer |
> Distributed by: (i)
>
> postgres=# create index bitmap_idx on bar using bitmap(i);
> CREATE INDEX
> postgres=# select localoid::regclass, * from gp_distribution_policy;
>           localoid          | localoid | attrnums
> ----------------------------+----------+----------
>  bar                        |    16398 | {1}
>  pg_bitmapindex.pg_bm_16415 |    16416 |
> (2 rows)

So the problem was that we created gp_distribution_policy entry for the
auxiliary heap table of the bitmap index. We no longer do that, this bug
was fixed 9 years ago. But the test we have in mpp8014 would not fail,
even if the bug reappeared! Let's remove the test, as it's useless in its
current form. It would be nice to have a proper test for that bug, but it
doesn't seem very likely to re-appear any time soon, so it doesn't seem
worth the effort.

Fixes https://github.com/greenplum-db/gpdb/issues/6315

"remoteHost" is not a parameter to ReadPostmasterTempFile.remote(),
fix by just passing the value. The ReadPostmasterTempFile __init__
does however have a remoteHost parameter, which is likely where the
confusion occurred.

This codepath was rarely executed, but when reached it would create
the following error message:

  [ERROR]:-Failed to stop standby. Attempting forceful termination of standby process
  [CRITICAL]:-gpstop failed. (Reason='remote() got an unexpected keyword argument 'remoteHost'') exiting...
Reviewed-by: NJimmy Yih <jyih@pivotal.io>

This removes a duplicate import and a few set, but never used, vars
from the gpload.py code as well as the including_defaults token as
it was clearly unused.

Also fixes a few typos while in there, one of which is a user facing
error message.
Reviewed-by: NJacob Champion <pchampion@pivotal.io>

Resource group comes with a view gp_toolkit.gp_resgroup_status to get
the running status of all the resource groups.  The cpu and memory
usages as displayed in json format, they are hard to parse and
understand by human.  To make it more user friendly we now provide two
new views on the status, the cpu and memory usages are flatten into
multiple columns.  They also group the status by segment or host so it
is easier to find out the usages at different levels.
Reviewed-by: NZhenghua Lyu <zlv@pivotal.io>

pg_upgrade upgrade the database in utility mode, but we can
not get the correct numsegments in the utility mode, now
we calculate the segments count by the gp_segment_configuration
when it is a utility QD process, then pg_upgrade can use it.

If the cluster is in expansion mode, then there must be some partial
tables which are not equal between numsegments and cluster size.
Now we check the expansion status by table's numsegments when we run
gpexpand, gpexpand will raise an error if there are partial tables.

The gp_ignore_error_table GUC will be deprecated in Greenplum 6 to
be removed in Greenplum 7. Highlight this in the documentation.

Discussion: https://groups.google.com/a/greenplum.org/forum/#!topic/gpdb-dev/mzYcVk_G5UwReviewed-by: NDavid Yozie <dyozie@pivotal.io>

The INTO ERROR TABLE syntax has been deprecated since Greenplum 5
shipped.

Discussion: https://groups.google.com/a/greenplum.org/forum/#!topic/gpdb-dev/mzYcVk_G5UwReviewed-by: NDavid Yozie <dyozie@pivotal.io>

- Assumes single node setup for CI. The test generates its own cluster.

- manages situations where the replication slot already exists.

Increase timeout for promotion from 10 seconds to 30 seconds. We noticed
that in failing tests that promotion took longer than 10 seconds.
Co-authored-by: NEkta Khanna <ekhanna@pivotal.io>

vacuum_rel already performs the tests and all current codepaths
pass through it. Block decorated by GPDB_93_MERGE_FIXME tag.
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>

The 'nloop' counts showed one too much. Here's how it happened:

1. In the QE processes, cdbexplain_sendExecStats() was called, and
   a node's 'running' flag was true. It called InstrEndLoop() on the
   node, which incremented 'nloops', and reset 'running' to false.

2. In the stats that were collected and sent to the QD, 'running' was
   recorded as 'true', and for 'nloops', the incremented value.

3. In the QD, the stats were received from the QE, and installed to the
   local Instrumentation structs.

4. QD called ExplainNode(), which saw that running=true, because that's the
   value that was received from the QE, and it called InstrEndLoop() again.

Fix, by not including the 'running' flag in the Instrumentation information
that is sent from QE to QD. The stats sent reflect the situation after
InstrEndLoop() has already been called.

Fixes https://github.com/greenplum-db/gpdb/issues/5854Reviewed-by: NGeorgios Kokolatos <gkokolatos@pivotal.io>
Reviewed-by: NPengzhou Tang <ptang@pivotal.io>

This reverts commit 1045e4e7.

This reverts commit db43ee3d.

This reverts commit b95059a8.

Based on Heikki's comments, we still need more discussion on the hook position.
For heap table part, continue to work on pgsql-hackers, to define the appropriate set of hooks for PostgreSQL, which we can then adopt in GPDB.
For AO/CO part, continue to talk on original PR and gpdb-dev list.

The resource group tests on views were sensitive to cluster size, the
answer file was generated on a default demo cluster, but the pipeline
jobs for resgroup are using a 2 segments cluster, so the tests will fail
on the pipeline.

Fixed by adding a filter to only check the status of master.

Because it's faster and compresses better. Like with the old zlib code, if
libzstd is not available, fall back to no compression. There was debate on
whether we should fall back to zlib, if that's available, but maintaining
alternative code is not free. Zstandard is so much faster than zlib, that
anyone running a production system really should build with it. A
developer's laptop is a different story, and falling back to no
compression is fine for that.

Discussion: https://groups.google.com/a/greenplum.org/d/msg/gpdb-dev/8w7vRuaqJ6c/uHpOJXwyEgAJReviewed-by: NAshwin Agrawal <aagrawal@pivotal.io>
Reviewed-by: NDaniel Gustafsson <dgustafsson@pivotal.io>

Resource group comes with a view gp_toolkit.gp_resgroup_status to get
the running status of all the resource groups.  The cpu and memory
usages as displayed in json format, they are hard to parse and
understand by human.  To make it more user friendly we now provide two
new views on the status, the cpu and memory usages are flatten into
multiple columns.  They also group the status by segment or host so it
is easier to find out the usages at different levels.
Reviewed-by: NZhenghua Lyu <zlv@pivotal.io>

Resource group id of my proc is stored in a local variable accessible
only in resgroup.c, but this information can also be interested in other
contexts, so an API `GetMyResGroupId()` is provided to get this
information.
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>
Reviewed-by: NHao Wang <haowang@pivotal.io>

Diskquota extension needs two kinds of hooks:
1. hooks to detect active tables when tables are being modified.
2. hooks to cancel a query whose quota limit is reached.

These two kinds of hooks are described in detail in Wiki:
https://github.com/greenplum-db/gpdb/wiki/Greenplum-Diskquota-Design#design-of-diskquota
They are corresponding to two components: Quota Enforcement Operator
and Quota Change Detector.
Co-authored-by: NHaozhou Wang <hawang@pivotal.io>
Co-authored-by: NHao Wu <gfphoenix78@gmail.com>

* Docs - update docs to note that system columns are unavailable in
queries on replicated tables.

* Edits from reviewers