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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
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55
src/backend/optimizer/util/clauses.c
View File

@ -51,6 +51,8 @@
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/fmgroids.h"
#include "utils/json.h"
#include "utils/jsonb.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
@ -383,6 +385,33 @@ contain_mutable_functions_walker(Node *node, void *context)
context))
return true;
if (IsA(node, JsonConstructorExpr))
{
const JsonConstructorExpr *ctor = (JsonConstructorExpr *) node;
ListCell *lc;
bool is_jsonb;
is_jsonb = ctor->returning->format->format_type == JS_FORMAT_JSONB;
/*
* Check argument_type => json[b] conversions specifically. We still
* recurse to check 'args' below, but here we want to specifically
* check whether or not the emitted clause would fail to be immutable
* because of TimeZone, for example.
*/
foreach(lc, ctor->args)
{
Oid typid = exprType(lfirst(lc));
if (is_jsonb ?
!to_jsonb_is_immutable(typid) :
!to_json_is_immutable(typid))
return true;
}
/* Check all subnodes */
}
if (IsA(node, NextValueExpr))
{
/* NextValueExpr is volatile */
@ -2786,6 +2815,32 @@ eval_const_expressions_mutator(Node *node,
}
break;
}
case T_JsonValueExpr:
{
JsonValueExpr *jve = (JsonValueExpr *) node;
Node *raw;
raw = eval_const_expressions_mutator((Node *) jve->raw_expr,
context);
if (raw && IsA(raw, Const))
{
Node *formatted;
Node *save_case_val = context->case_val;
context->case_val = raw;
formatted = eval_const_expressions_mutator((Node *) jve->formatted_expr,
context);
context->case_val = save_case_val;
if (formatted && IsA(formatted, Const))
return formatted;
}
break;
}
case T_SubPlan:
case T_AlternativeSubPlan: