A long time ago, they were disabled, because the GIN code had not been
modified to work with file replication. Now with WAL replication, there's
no reason to not support them.

* docs: gpbackup new options -include-table -exclude-table

-Add new options
-Update AdminGuide

PR for 5X_STABLE
Will be ported to MAIN

* docs: gpbackup - fix typos

Since persistent tables were removed, these were not used for anything.

Plenty remains, but this is a start.

* docs: updates to create function attribute execute on

* docs: review comment updates for CREATE FUNCTION

* docs - type SET DEFAULT ENCODING

* edits requested by david

* add gp-specific clauses to summary of greenplum features page

PR for 5X_STABLE
Will be ported to MAIN

* docs - add info about greenplum database release versioning

* misc edits requested by david

* update subnav titles

* clarify that deprecated features removed only in major release

* docs - review zstd doc additions, misc related edits

* modify ddl storage example 1 to use zstd

* docs - persist resource group configuration

* recreate, not persist, the cgroup hierarchies

* configure service start cmds with preferred auto-start tool

* docs - costing diffs between gporca/planner and RQ limits

* mention fallback

* RQs do not align/differentiate costs between planners

* Enhance hardening docs on trust and ident

* Format source. No content changes.

* docs - updates for gphdfs jar file changes

* updates include:

- add note that default value gphd-1.1. is not supported
- remove references to Pivotal and Greenplum HD

* add -compression-level

* add -single-data-file option

* add gprestore -include-schema and -include-table-file options

* removing statement about using -compression-level and -no-compression together

* remove restriction about using both -include-schema and -redirect together

* remove restriction about using both -include-table-file and -globals together

* add note re: default compression level

* docs: optimizer_join_order guc

* Implement suggested edits

* Note iteractions with other params; correct inaccurate statement.

* Clarify this is a GPORCA guc

Add a new compression option for append-optimized tables, "zstd". It is
generally faster than zlib or quicklz, and compresses better. Or at least
it can be faster or compress better, if not both at the same time, by
adjusting the compression level. A major advantage of Zstandard is the wide
range of tuning, to choose the trade-off between compression speed and
ratio.

Update documentation to mention "zstd" alongside "zlib" and "quicklz". More
could be done; all the examples still use zlib or quicklz, for example, and
I think we want to emphasize Zstandard more in the docs, over those other
options. But this is the bare minimum to keep the docs factually correct.

Using the new option requires building the server with the libzstd library.
A new --with-zstd option is added for that. The default is to build without
libzstd, for now, but we should probably change the default to be on, after
we have had a chance to update all the buildfarm machines to have libzstd.

Patch by Ivan Leskin, Dmitriy Pavlov, Anton Chevychalov. Test case, docs
changes, and some minor editorialization by Heikki Linnakangas.

* docs: gpbackup - add support for single level partitioned table w/ ext. tbl. leaf partition.

* docs: gpbackup edits based on review comments.
-changed gprestore default --jobs to 1.
-removed gprestore comment about faster restore of indexes to match admin guide.

* docs: gpbackup fixed typo.

* clarifying enable chapter

* move existing root partition info to new topic; add new best practices info

* docs - add pxf json profile info

* add missing an

* incorporate edits from david

* docs: S3 gpcheckcloud - add config parameter gpcheckcloud_newline

* docs: fix typo.

* docs: gpbackup/gprestore limitation for partitioned table with external table partition.

* docs: edit to fix a typo.

* docs: updated gpbackup/gprestore limitation. partitioned table w/ external table leaf part. not supported.

* docs - add content for pxf writable profiles

* use consistent naming for PXF

* add writing to HDFS book subnav

* main pxf subnav title change

* edits from david

* use consistent terms when introducing pxf

* not writing is experimental

* style experimental warning on write page closer to rest of docs

* dir/file distinction, other edits from alex

* discuss distributed by

* rename read topic, more info to distributed by

* docs: gpbackup/gprestore limitation for partitioned table with external table partition.

* docs: edit to fix a typo.

* docs - add content for PXF HBase profile

* fix incorrect table name - indirect mapping now working w example

* use new page title in pxf overview xrefs

* incorporate edits from david

* note that hbase does not support predicate pushdown

* removing docs for pgadmin (not included in build)

* remove pgadmin graphics

* docs - RG/RQ-qualify gpperfmon, other content where appropriate

* edits from david

* docs - add gp_toolkit discussion of resgroup views

* remove proposed_cpu_rate_limit