* docs - add info about moving a query to a different resource group

* need to be superuser

* remove upgrade/downgrade info for master

Cluster on AO tables is implemented by sorting the entire AO table using
tuple sort framework, according to a btree index defined on the table.

A faster way to cluster is to scan the tuples in index-order, but this
requires index-scan support.  Append-optimized tables do not support
index-scans currently, but when this support is added, the cluster
operation can be enhanced accordingly.

Author: Andrey Borodin <amborodin@acm.org>
Reviewed and slightly edited by: Asim R P <pasim@vmare.com>

Merges GitHub PR #9996

* clarifying pg_upgrade note

* gpinitsystem -I second format

* gpinitsystem edits

* edits from review

* docs - document the new plcontainer --use_local_copy option

* add more words around when to use the option
Co-authored-by: NDavid Yozie <dyozie@pivotal.io>

* docs - restructure the platform requirements extensions table

* list newer version first

* remove MADlib superscript/note, add to Additional Info

* update plcontainer pkg versions to 2.1.2, R image to 3.6.3

* docs - enhance the pxf supported platforms section

* vendor -> bundle

most functions have been updated to use regclass (oid or table name)

* docs - clarify/fix CREATE TABLE syntax for partitioned tables

Also add more partitioned table examples.

* doc - minor updates to partitioned table syntax.

* docs - minor fix to syntax diagram

* docs - update bloat best practices

information from dev.
--Remove copying or redistributing table data as alternatives to VACUUM FULL
--Mention that VACUUM (without FULL) maintenance is for both heap and AO tables.

Also
Reorganized information.
Clarified ACCESS EXCLUSIVE lock is reason users cannot access table during VACUUM FULL

* docs - updates based on review comments.

* docs - removed warning about stopping VACUUM FULL.

* docs - new pxf IGNORE_MISSING_PATH option

* reword default case

* add IGNORE_MISSING_PATH info to relevant profiles

* the action to take

* try to describe why pxf behaviour is not optimal

* docs - clarify text for resource group CPU core usage in catalog tables.

* docs - minor edits

* docs - update for gpstart when standby master is not available

* docs - minor edits.

* Update gpstart.xml
Co-authored-by: NDavid Yozie <dyozie@pivotal.io>

* Update docs around ssl_ciphers default, default behavior, TLS 1.2 recommendations

* Update cipher string per Stanley's feedback

* docs - updates for PostGIS 2.5.4

-Updated version 2.1.5 -> 2.5.4
-Updated references to PostGIS topics
-Removed geometry and geography limitation
-Added enhancement for postgis_manager.sh script - support installing PostGIS in a non-default schema
-Added examples of updating postgis.enable_outdb_rasters and postgis.gdal_enabled_drivers for a GPDB session
-Remove ANALYZE limitation for user-defined data types
-Added  _postgis_index_extent function is not supported
-Added note: <-> operator returns centroid/centroid distance
-changed name of PostGIS aggregate function ST_MemCollect to ST_Collect

* docs - fix typo

* docs - minor changes to topic hierarchy.

* docs - one more minor hierarchy change.

* docs - update external URLs

* docs - fix typo, minor cleanup

* docs - found strange character

* docs - add Note about host requirements to segment mirror overview

-also edited some related topics and changed some links
-fixed a bad link to the gpcheck utiltiy (removed in GPDB 6)

* docs - minor edit
Co-authored-by: NDavid Yozie <dyozie@pivotal.io>

* docs - add information about view dependency

-example queries to find dependency information
-catalog table information
-best practices

* docs - minor edits and fixes.

* docs - fix minor typo.

* docs - another minor edit.

* clarifying pg_upgrade note

* adding VACUUM note for gpexpand

* gpexpand edits

* small edit

* edits after review

- add landing page for upgrade (6->6 upgrade, 4/5->6 migration)
- nest in subnav

* docs - add info about querying the pg_stat_last_operation tbl

* edits requested by david

* docs WIP - add some python3 info

* move data type mapping to pl/python page; add more py3 info

* add set-returning function example

* address comments from david

Also add note to not change GUC value.

* docs - provide some config info for PAM authentication

* misc edit per david

* misc edits to genericize