As we merge with upstream and by that keep refining the Postgres
planner, legacy planner is no longer a suitable name. This changes
all variations of the spelling (legacy planner, legacy optimizer,
legacy query optimizer etc) to say "Postgres" rather than "legacy".
Reviewed-by: NVenkatesh Raghavan <vraghavan@pivotal.io>
Reviewed-by: NDavid Yozie <dyozie@pivotal.io>
Reviewed-by: NGeorgios Kokolatos <gkokolatos@pivotal.io>

The GUC which enables recursive CTEs is in the currently released
version called gp_recursive_cte_prototype, but in order to reflect
the current state of the code it's now renamed to gp_recursive_cte.
By default the GUC is still off, but that might change before we
ship the next release.

The previous GUC name is still supported, but marked as deprecated,
in order to make upgrades easier.
Reviewed-by: NIvan Novick <inovick@pivotal.io>
Reviewed-by: NGeorgios Kokolatos <gkokolatos@pivotal.io>

* docs - CTE available with INSERT, UPDATE, DELETE

-updated GUC
-updated Admin Guide topic WITH Queries (Common Table Expressions)

updates to SELECT, INSERT, UPDATE DELETE will be part of postgres 9.2 merge.

* docs - CTE updates from review comments

* docs - CTE more updates from review comments

* docs - CTE - updates from review comments

* Experimental -> Beta wording

* reword from 'experimental' to 'beta'

* Experimental -> Beta in markdown source

* typo fix

* Removing SuSE 11 details in Beta notes

* Adds window examples to query topic in admin guide

* Fix some clear errors in CREATE TYPE and CREATE FUNCTION SQL

* Changes from review comments

* Add missing period

We used to call some node types different names in EXPLAIN output,
depending on whether the plan was generated by ORCA or the Postgres
planner. Also, a Bitmap Heap Scan used to be called differently, when the
table was an AO or AOCS table, but only in planner-generated plans. There
was some historical justification for this, because they used to
be different executor node types, but commit db516347 removed last such
differences.

Full list of renames:

Table Scan -> Seq Scan
Append-only Scan -> Seq Scan
Append-only Columnar Scan -> Seq Scan
Dynamic Table Scan -> Dynamic Seq Scan
Bitmap Table Scan -> Bitmap Heap Scan
Bitmap Append-Only Row-Oriented Scan -> Bitmap Heap Scan
Bitmap Append-Only Column-Oriented Scan -> Bitmap Heap Scan
Dynamic Bitmap Table Scan -> Dynamic Bitmap Heap Scan

* docs - updates for jsonb type

* docs - jsonb docs - review comment updates.

* docs - jsonb docs - remove duplicate text.

Commit 17f9b7f070dbe17b2844a8b4dd428 in the pgweb repository removed
the /static/ portion on all doc URLs, leaving a redirect in place. To
avoid incurring a needless redirect, remove the /static/ part in the
links to the PostgreSQL documentation.

The /static/ URLs stem from a time when there were interactive docs
that had comment functionality. These docs were removed a very long
time ago, but the static differentiator was left in place until now.

Reviewed-by: Mel Kiyama

* Adds PostgreSQL full text search docs to GPDB docs

* Add link to new text search section to internal toc

* Restore unintentional delete

* Fix cross-refs and uppercase GIN

* Small edits and changes from review

* Addresses review comments

- Move text search to Query section of admin guide
- Add chapter tocs
- Add GPText comparison to About Full Text Search topic
- Link fix

* Update admin guide and ref guide functions docs for replicated tables

Functions that execute on segments can perform read-only queries on replicated tables.
Add an example function that queries a replicated table on segments.

* Rewrite a difficult sentence.

The PostgreSQL documentation is only available over https, with a 307
redirect, so update all links to be https. Also remove interactive mode
links as the documentation is all static these days.
Reviewed-by: NHeikki Linnakangas <hlinnakangas@pivotal.io>

* docs - sql and catalog ref page updates for i/o conversion casts

* address comments from heikki

* docs - ANALYZE command - HLL statistics, incremental analyze

also updates topics related to partitioned table statistics.

This will be backported to 5X_STABLE with these changes

--stakind5 is not available
--stakind5 =99 is moved to stakind4.

* docs - ANALYZE - HLL statistics, incremental analyze - updates based on review comments.

* docs - ANALYZE - HLL statistics, incremental analyze - minor late updates.

* docs - ANALYZE - HLL statistics, incremental analyze - fix x-refs.

* docs - add pseudo-type anytable to datatypes topic

* Move GPPC out of conditional section and ack GPPC can also access table

* docs - update guc gp_enable_relsize_collection - ORCA support
Will be ported to 5X_STABLE.

-Move cast examples to install guide
-Pointer from install guide to admin guide for cast description.

* docs: update cast information for GPDB 5/6

Update cast information. Add information about limited text casts.
See section "Type Casts"

* docs: review comments for GPDB 5/6 updated cast information.

* docs: fix typos in updated CAST info

* DOCS: clarify GPORCA index support
-only B-tree and bitmap indexes are supported. GPORCA ignores indexes created with unsupported indexing methods.

* docs: GPORCA index support review update - move notes to index type parameter.

* docs - remove guc category section and doc files from admin guide

* add server config param categories to ref guide left nav

-Add  GUC optimizer_enable_associativity
-Add limitation for ONLY table name qualifier  (fallback to planner)

* docs - add cancel/term backend content

* address comments from daniel

* use single l in cancel tenses

* docs: update to GPORCA limitations
-removed window function limitation
-added aggregate functions with set operators as input

PR for 5X_STABLE
Will be ported to MAIN

* re-added PERCENTILE window function - support is for 6.0 only.

* docs: GPORCA removed limitation - multiple DISTINCT qualified aggregate functions

* docs: updates to create function attribute execute on

* docs: review comment updates for CREATE FUNCTION

* docs: optimizer_join_order guc

* Implement suggested edits

* Note iteractions with other params; correct inaccurate statement.

* Clarify this is a GPORCA guc

* clarifying enable chapter

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

* docs - clarify how/when sequences are advanced, is_called

* add more info about is_called

* spelling error, ref pages

* requested edit from david

* reorganizing / promoting external tables topic

* correcting graphics locations

* more reorg and consolidation of topics

* promoting shortdescs, consolidating web table topics

* removing duplicate, manual chapter toc

* promoting more shortdesc's, removing more manual tocs

* changing title of hdfs section

* promoting gphdfs section, removing oveverview section that mentions pxf

* adding shortdesc to gphdfs topic

* DOCS: SELECT - Add RECURSIVE keyword to WITH clause

* docs: recursive CTE - add experimental designation. Add GUC gp_recursive_cte_prototype

* docs: updated recursive CTE docs based on review comments.