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SQL/JSON query functions

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This introduces the SQL/JSON functions for querying JSON data using
jsonpath expressions. The functions are:

JSON_EXISTS()
JSON_QUERY()
JSON_VALUE()

All of these functions only operate on jsonb. The workaround for now is
to cast the argument to jsonb.

JSON_EXISTS() tests if the jsonpath expression applied to the jsonb
value yields any values. JSON_VALUE() must return a single value, and an
error occurs if it tries to return multiple values. JSON_QUERY() must
return a json object or array, and there are various WRAPPER options for
handling scalar or multi-value results. Both these functions have
options for handling EMPTY and ERROR conditions.

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 13:11:14 -05:00
parent 3d067c53b2
commit 1a36bc9dba
39 changed files with 4719 additions and 124 deletions
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70
src/backend/nodes/outfuncs.c
View File

@ -1808,6 +1808,64 @@ _outJsonIsPredicate(StringInfo str, const JsonIsPredicate *node)
WRITE_LOCATION_FIELD(location);
}
static void
_outJsonBehavior(StringInfo str, const JsonBehavior *node)
{
WRITE_NODE_TYPE("JSONBEHAVIOR");
WRITE_ENUM_FIELD(btype, JsonBehaviorType);
WRITE_NODE_FIELD(default_expr);
}
static void
_outJsonExpr(StringInfo str, const JsonExpr *node)
{
WRITE_NODE_TYPE("JSONEXPR");
WRITE_ENUM_FIELD(op, JsonExprOp);
WRITE_NODE_FIELD(formatted_expr);
WRITE_NODE_FIELD(result_coercion);
WRITE_NODE_FIELD(format);
WRITE_NODE_FIELD(path_spec);
WRITE_NODE_FIELD(passing_values);
WRITE_NODE_FIELD(passing_names);
WRITE_NODE_FIELD(returning);
WRITE_NODE_FIELD(on_error);
WRITE_NODE_FIELD(on_empty);
WRITE_NODE_FIELD(coercions);
WRITE_ENUM_FIELD(wrapper, JsonWrapper);
WRITE_BOOL_FIELD(omit_quotes);
WRITE_LOCATION_FIELD(location);
}
static void
_outJsonCoercion(StringInfo str, const JsonCoercion *node)
{
WRITE_NODE_TYPE("JSONCOERCION");
WRITE_NODE_FIELD(expr);
WRITE_BOOL_FIELD(via_populate);
WRITE_BOOL_FIELD(via_io);
WRITE_OID_FIELD(collation);
}
static void
_outJsonItemCoercions(StringInfo str, const JsonItemCoercions *node)
{
WRITE_NODE_TYPE("JSONITEMCOERCIONS");
WRITE_NODE_FIELD(null);
WRITE_NODE_FIELD(string);
WRITE_NODE_FIELD(numeric);
WRITE_NODE_FIELD(boolean);
WRITE_NODE_FIELD(date);
WRITE_NODE_FIELD(time);
WRITE_NODE_FIELD(timetz);
WRITE_NODE_FIELD(timestamp);
WRITE_NODE_FIELD(timestamptz);
WRITE_NODE_FIELD(composite);
}
/*****************************************************************************
*
* Stuff from pathnodes.h.
@ -4644,6 +4702,18 @@ outNode(StringInfo str, const void *obj)
case T_JsonIsPredicate:
_outJsonIsPredicate(str, obj);
break;
case T_JsonBehavior:
_outJsonBehavior(str, obj);
break;
case T_JsonExpr:
_outJsonExpr(str, obj);
break;
case T_JsonCoercion:
_outJsonCoercion(str, obj);
break;
case T_JsonItemCoercions:
_outJsonItemCoercions(str, obj);
break;
default: