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Common SQL/JSON clauses

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This introduces some of the building blocks used by the SQL/JSON
constructor and query functions. Specifically, it provides node
executor and grammar support for the FORMAT JSON [ENCODING foo]
clause, and values decorated with it, and for the RETURNING clause.

The following SQL/JSON patches will leverage these.

Nikita Glukhov (who probably deserves an award for perseverance).

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 13:00:49 -05:00
parent b64c3bd62e
commit f79b803dcc
17 changed files with 758 additions and 2 deletions
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39
src/backend/nodes/outfuncs.c
View File

@ -1751,6 +1751,36 @@ _outOnConflictExpr(StringInfo str, const OnConflictExpr *node)
WRITE_NODE_FIELD(exclRelTlist);
}
static void
_outJsonFormat(StringInfo str, const JsonFormat *node)
{
WRITE_NODE_TYPE("JSONFORMAT");
WRITE_ENUM_FIELD(format_type, JsonFormatType);
WRITE_ENUM_FIELD(encoding, JsonEncoding);
WRITE_LOCATION_FIELD(location);
}
static void
_outJsonReturning(StringInfo str, const JsonReturning *node)
{
WRITE_NODE_TYPE("JSONRETURNING");
WRITE_NODE_FIELD(format);
WRITE_OID_FIELD(typid);
WRITE_INT_FIELD(typmod);
}
static void
_outJsonValueExpr(StringInfo str, const JsonValueExpr *node)
{
WRITE_NODE_TYPE("JSONVALUEEXPR");
WRITE_NODE_FIELD(raw_expr);
WRITE_NODE_FIELD(formatted_expr);
WRITE_NODE_FIELD(format);
}
/*****************************************************************************
*
* Stuff from pathnodes.h.
@ -4537,6 +4567,15 @@ outNode(StringInfo str, const void *obj)
case T_PartitionRangeDatum:
_outPartitionRangeDatum(str, obj);
break;
case T_JsonFormat:
_outJsonFormat(str, obj);
break;
case T_JsonReturning:
_outJsonReturning(str, obj);
break;
case T_JsonValueExpr:
_outJsonValueExpr(str, obj);
break;
default: