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Amit Langote bb766cde63 JSON_TABLE: Add support for NESTED paths and columns 
A NESTED path allows to extract data from nested levels of JSON
objects given by the parent path expression, which are projected as
columns specified using a nested COLUMNS clause, just like the parent
COLUMNS clause.  Rows comprised from a NESTED columns are "joined"
to the row comprised from the parent columns.  If a particular NESTED
path evaluates to 0 rows, then the nested COLUMNS will emit NULLs,
making it an OUTER join.

NESTED columns themselves may include NESTED paths to allow
extracting data from arbitrary nesting levels, which are likewise
joined against the rows at the parent level.

Multiple NESTED paths at a given level are called "sibling" paths
and their rows are combined by UNIONing them, that is, after being
joined against the parent row as described above.

Author: Nikita Glukhov <n.gluhov@postgrespro.ru>
Author: Teodor Sigaev <teodor@sigaev.ru>
Author: Oleg Bartunov <obartunov@gmail.com>
Author: Alexander Korotkov <aekorotkov@gmail.com>
Author: Andrew Dunstan <andrew@dunslane.net>
Author: Amit Langote <amitlangote09@gmail.com>
Author: Jian He <jian.universality@gmail.com>

Reviewers have included (in no particular order):

Andres Freund, Alexander Korotkov, Pavel Stehule, Andrew Alsup,
Erik Rijkers, Zihong Yu, Himanshu Upadhyaya, Daniel Gustafsson,
Justin Pryzby, Álvaro Herrera, Jian He

Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
Discussion: https://postgr.es/m/20220616233130.rparivafipt6doj3@alap3.anarazel.de
Discussion: https://postgr.es/m/abd9b83b-aa66-f230-3d6d-734817f0995d%40postgresql.org
Discussion: https://postgr.es/m/CA+HiwqE4XTdfb1nW=Ojoy_tQSRhYt-q_kb6i5d4xcKyrLC1Nbg@mail.gmail.com
 		2024-04-08 16:14:13 +09:00
..
compatlib ecpg: Fix return code for overflow in numeric conversion 2024-03-25 14:18:36 +01:00
ecpglib Avoid concurrent calls to bindtextdomain(). 2024-02-09 11:21:08 -05:00
include Clean up Windows-specific mutex code in libpq and ecpglib. 2024-02-09 11:11:39 -05:00
pgtypeslib ecpg: Fix error handling on OOMs when parsing timestamps 2024-02-19 09:05:51 +09:00
preproc Fix ecpg's mechanism for detecting unsupported cases in the grammar. 2024-04-04 15:31:53 -04:00
test JSON_TABLE: Add support for NESTED paths and columns 2024-04-08 16:14:13 +09:00
Makefile Remove distprep 2023-11-06 15:18:04 +01:00
README.dynSQL Fix whitespace issues found by git diff --check, add gitattributes 2013-11-10 14:48:29 -05:00
meson.build Update copyright for 2024 2024-01-03 20:49:05 -05:00

README.dynSQL 

src/interfaces/ecpg/README.dynSQL

descriptor statements have the following shortcomings

- input descriptors (USING DESCRIPTOR <name>) are not supported

  Reason: to fully support dynamic SQL the frontend/backend communication
          should change to recognize input parameters.
          Since this is not likely to happen in the near future and you
          can cover the same functionality with the existing infrastructure
          (using s[n]printf), I'll leave the work to someone else.