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SQL/JSON constructors

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This patch introduces the SQL/JSON standard constructors for JSON:

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

For the most part these functions provide facilities that mimic
existing json/jsonb functions. However, they also offer some useful
additional functionality. In addition to text input, the JSON() function
accepts bytea input, which it will decode and constuct a json value from.
The other functions provide useful options for handling duplicate keys
and null values.

This series of patches will be followed by a consolidated documentation
patch.

Nikita Glukhov

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/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
This commit is contained in:
Andrew Dunstan
2022-03-03 13:02:10 -05:00
parent f79b803dcc
commit f4fb45d15c
37 changed files with 3615 additions and 130 deletions
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132
src/backend/nodes/equalfuncs.c
View File

@@ -871,6 +871,111 @@ _equalJsonValueExpr(const JsonValueExpr *a, const JsonValueExpr *b)
return true;
}
static bool
_equalJsonConstructorExpr(const JsonConstructorExpr *a, const JsonConstructorExpr *b)
{
COMPARE_SCALAR_FIELD(type);
COMPARE_NODE_FIELD(args);
COMPARE_NODE_FIELD(func);
COMPARE_NODE_FIELD(coercion);
COMPARE_NODE_FIELD(returning);
COMPARE_SCALAR_FIELD(absent_on_null);
COMPARE_SCALAR_FIELD(unique);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalJsonKeyValue(const JsonKeyValue *a, const JsonKeyValue *b)
{
COMPARE_NODE_FIELD(key);
COMPARE_NODE_FIELD(value);
return true;
}
static bool
_equalJsonObjectConstructor(const JsonObjectConstructor *a,
const JsonObjectConstructor *b)
{
COMPARE_NODE_FIELD(exprs);
COMPARE_NODE_FIELD(output);
COMPARE_SCALAR_FIELD(absent_on_null);
COMPARE_SCALAR_FIELD(unique);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalJsonAggConstructor(const JsonAggConstructor *a,
const JsonAggConstructor *b)
{
COMPARE_NODE_FIELD(output);
COMPARE_NODE_FIELD(agg_filter);
COMPARE_NODE_FIELD(agg_order);
COMPARE_NODE_FIELD(over);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalJsonObjectAgg(const JsonObjectAgg *a, const JsonObjectAgg *b)
{
COMPARE_NODE_FIELD(constructor);
COMPARE_NODE_FIELD(arg);
COMPARE_SCALAR_FIELD(absent_on_null);
COMPARE_SCALAR_FIELD(unique);
return true;
}
static bool
_equalJsonOutput(const JsonOutput *a, const JsonOutput *b)
{
COMPARE_NODE_FIELD(typeName);
COMPARE_NODE_FIELD(returning);
return true;
}
static bool
_equalJsonArrayConstructor(const JsonArrayConstructor *a,
const JsonArrayConstructor *b)
{
COMPARE_NODE_FIELD(exprs);
COMPARE_NODE_FIELD(output);
COMPARE_SCALAR_FIELD(absent_on_null);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalJsonArrayAgg(const JsonArrayAgg *a, const JsonArrayAgg *b)
{
COMPARE_NODE_FIELD(constructor);
COMPARE_NODE_FIELD(arg);
COMPARE_SCALAR_FIELD(absent_on_null);
return true;
}
static bool
_equalJsonArrayQueryConstructor(const JsonArrayQueryConstructor *a,
const JsonArrayQueryConstructor *b)
{
COMPARE_NODE_FIELD(query);
COMPARE_NODE_FIELD(output);
COMPARE_NODE_FIELD(format);
COMPARE_SCALAR_FIELD(absent_on_null);
COMPARE_LOCATION_FIELD(location);
return true;
}
/*
* Stuff from pathnodes.h
*/
@@ -3398,6 +3503,9 @@ equal(const void *a, const void *b)
case T_JsonValueExpr:
retval = _equalJsonValueExpr(a, b);
break;
case T_JsonConstructorExpr:
retval = _equalJsonConstructorExpr(a, b);
break;
/*
* RELATION NODES
@@ -3978,6 +4086,30 @@ equal(const void *a, const void *b)
case T_PublicationTable:
retval = _equalPublicationTable(a, b);
break;
case T_JsonKeyValue:
retval = _equalJsonKeyValue(a, b);
break;
case T_JsonObjectConstructor:
retval = _equalJsonObjectConstructor(a, b);
break;
case T_JsonAggConstructor:
retval = _equalJsonAggConstructor(a, b);
break;
case T_JsonObjectAgg:
retval = _equalJsonObjectAgg(a, b);
break;
case T_JsonOutput:
retval = _equalJsonOutput(a, b);
break;
case T_JsonArrayConstructor:
retval = _equalJsonArrayConstructor(a, b);
break;
case T_JsonArrayQueryConstructor:
retval = _equalJsonArrayQueryConstructor(a, b);
break;
case T_JsonArrayAgg:
retval = _equalJsonArrayAgg(a, b);
break;
default:
elog(ERROR, "unrecognized node type: %d",