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SQL/JSON: add standard JSON constructor functions

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This commit introduces the SQL/JSON standard-conforming constructors for
JSON types:

JSON_ARRAY()
JSON_ARRAYAGG()
JSON_OBJECT()
JSON_OBJECTAGG()

Most of the functionality was already present in PostgreSQL-specific
functions, but these include some new functionality such as the ability
to skip or include NULL values, and to allow duplicate keys or throw
error when they are found, as well as the standard specified syntax to
specify output type and format.

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: Amit Langote <amitlangote09@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.

Discussion: https://postgr.es/m/CAF4Au4w2x-5LTnN_bxky-mq4=WOqsGsxSpENCzHRAzSnEd8+WQ@mail.gmail.com
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
This commit is contained in:
Alvaro Herrera
2023-03-29 12:11:36 +02:00
parent 38b7437b90
commit 7081ac46ac
42 changed files with 4472 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/interfaces/ecpg/preproc/parser.c
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@ -78,9 +78,11 @@ filtered_base_yylex(void)
*/
switch (cur_token)
{
case FORMAT:
case NOT:
case NULLS_P:
case WITH:
case WITHOUT:
case UIDENT:
case USCONST:
break;
@ -110,6 +112,16 @@ filtered_base_yylex(void)
/* Replace cur_token if needed, based on lookahead */
switch (cur_token)
{
case FORMAT:
/* Replace FORMAT by FORMAT_LA if it's followed by JSON */
switch (next_token)
{
case JSON:
cur_token = FORMAT_LA;
break;
}
break;
case NOT:
/* Replace NOT by NOT_LA if it's followed by BETWEEN, IN, etc */
switch (next_token)
@ -145,6 +157,16 @@ filtered_base_yylex(void)
break;
}
break;
case WITHOUT:
/* Replace WITHOUT by WITHOUT_LA if it's followed by UNIQUE */
switch (next_token)
{
case UNIQUE:
cur_token = WITHOUT_LA;
break;
}
break;
case UIDENT:
case USCONST:
/* Look ahead for UESCAPE */