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Second attempt at organizing jsonpath operators and methods 

Second attempt at 283a95da92.  Since we can't reorder the enum values
of JsonPathItemType, instead reorder the switch cases where they are
used to generally follow the order of the enum values, for better
maintainability.
This commit is contained in:
Peter Eisentraut 2024-01-03 21:56:41 +01:00
parent 0958f8f6bf
commit 59fd390d5e
3 changed files with 301 additions and 294 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

250
src/backend/utils/adt/jsonpath.c
View File

@ -519,18 +519,9 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
case jpiNull:
appendStringInfoString(buf, "null");
break;
case jpiKey:
if (inKey)
appendStringInfoChar(buf, '.');
escape_json(buf, jspGetString(v, NULL));
break;
case jpiString:
escape_json(buf, jspGetString(v, NULL));
break;
case jpiVariable:
appendStringInfoChar(buf, '$');
escape_json(buf, jspGetString(v, NULL));
break;
case jpiNumeric:
if (jspHasNext(v))
appendStringInfoChar(buf, '(');
@ -576,58 +567,6 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
if (printBracketes)
appendStringInfoChar(buf, ')');
break;
case jpiLikeRegex:
if (printBracketes)
appendStringInfoChar(buf, '(');
jspInitByBuffer(&elem, v->base, v->content.like_regex.expr);
printJsonPathItem(buf, &elem, false,
operationPriority(elem.type) <=
operationPriority(v->type));
appendStringInfoString(buf, " like_regex ");
escape_json(buf, v->content.like_regex.pattern);
if (v->content.like_regex.flags)
{
appendStringInfoString(buf, " flag \"");
if (v->content.like_regex.flags & JSP_REGEX_ICASE)
appendStringInfoChar(buf, 'i');
if (v->content.like_regex.flags & JSP_REGEX_DOTALL)
appendStringInfoChar(buf, 's');
if (v->content.like_regex.flags & JSP_REGEX_MLINE)
appendStringInfoChar(buf, 'm');
if (v->content.like_regex.flags & JSP_REGEX_WSPACE)
appendStringInfoChar(buf, 'x');
if (v->content.like_regex.flags & JSP_REGEX_QUOTE)
appendStringInfoChar(buf, 'q');
appendStringInfoChar(buf, '"');
}
if (printBracketes)
appendStringInfoChar(buf, ')');
break;
case jpiPlus:
case jpiMinus:
if (printBracketes)
appendStringInfoChar(buf, '(');
appendStringInfoChar(buf, v->type == jpiPlus ? '+' : '-');
jspGetArg(v, &elem);
printJsonPathItem(buf, &elem, false,
operationPriority(elem.type) <=
operationPriority(v->type));
if (printBracketes)
appendStringInfoChar(buf, ')');
break;
case jpiFilter:
appendStringInfoString(buf, "?(");
jspGetArg(v, &elem);
printJsonPathItem(buf, &elem, false, false);
appendStringInfoChar(buf, ')');
break;
case jpiNot:
appendStringInfoString(buf, "!(");
jspGetArg(v, &elem);
@ -640,22 +579,17 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
printJsonPathItem(buf, &elem, false, false);
appendStringInfoString(buf, ") is unknown");
break;
case jpiExists:
appendStringInfoString(buf, "exists (");
case jpiPlus:
case jpiMinus:
if (printBracketes)
appendStringInfoChar(buf, '(');
appendStringInfoChar(buf, v->type == jpiPlus ? '+' : '-');
jspGetArg(v, &elem);
printJsonPathItem(buf, &elem, false, false);
appendStringInfoChar(buf, ')');
break;
case jpiCurrent:
Assert(!inKey);
appendStringInfoChar(buf, '@');
break;
case jpiRoot:
Assert(!inKey);
appendStringInfoChar(buf, '$');
break;
case jpiLast:
appendStringInfoString(buf, "last");
printJsonPathItem(buf, &elem, false,
operationPriority(elem.type) <=
operationPriority(v->type));
if (printBracketes)
appendStringInfoChar(buf, ')');
break;
case jpiAnyArray:
appendStringInfoString(buf, "[*]");
@ -712,6 +646,35 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
v->content.anybounds.first,
v->content.anybounds.last);
break;
case jpiKey:
if (inKey)
appendStringInfoChar(buf, '.');
escape_json(buf, jspGetString(v, NULL));
break;
case jpiCurrent:
Assert(!inKey);
appendStringInfoChar(buf, '@');
break;
case jpiRoot:
Assert(!inKey);
appendStringInfoChar(buf, '$');
break;
case jpiVariable:
appendStringInfoChar(buf, '$');
escape_json(buf, jspGetString(v, NULL));
break;
case jpiFilter:
appendStringInfoString(buf, "?(");
jspGetArg(v, &elem);
printJsonPathItem(buf, &elem, false, false);
appendStringInfoChar(buf, ')');
break;
case jpiExists:
appendStringInfoString(buf, "exists (");
jspGetArg(v, &elem);
printJsonPathItem(buf, &elem, false, false);
appendStringInfoChar(buf, ')');
break;
case jpiType:
appendStringInfoString(buf, ".type()");
break;
@ -742,6 +705,43 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
case jpiKeyValue:
appendStringInfoString(buf, ".keyvalue()");
break;
case jpiLast:
appendStringInfoString(buf, "last");
break;
case jpiLikeRegex:
if (printBracketes)
appendStringInfoChar(buf, '(');
jspInitByBuffer(&elem, v->base, v->content.like_regex.expr);
printJsonPathItem(buf, &elem, false,
operationPriority(elem.type) <=
operationPriority(v->type));
appendStringInfoString(buf, " like_regex ");
escape_json(buf, v->content.like_regex.pattern);
if (v->content.like_regex.flags)
{
appendStringInfoString(buf, " flag \"");
if (v->content.like_regex.flags & JSP_REGEX_ICASE)
appendStringInfoChar(buf, 'i');
if (v->content.like_regex.flags & JSP_REGEX_DOTALL)
appendStringInfoChar(buf, 's');
if (v->content.like_regex.flags & JSP_REGEX_MLINE)
appendStringInfoChar(buf, 'm');
if (v->content.like_regex.flags & JSP_REGEX_WSPACE)
appendStringInfoChar(buf, 'x');
if (v->content.like_regex.flags & JSP_REGEX_QUOTE)
appendStringInfoChar(buf, 'q');
appendStringInfoChar(buf, '"');
}
if (printBracketes)
appendStringInfoChar(buf, ')');
break;
default:
elog(ERROR, "unrecognized jsonpath item type: %d", v->type);
}
@ -771,11 +771,11 @@ jspOperationName(JsonPathItemType type)
return "<=";
case jpiGreaterOrEqual:
return ">=";
case jpiPlus:
case jpiAdd:
case jpiPlus:
return "+";
case jpiMinus:
case jpiSub:
case jpiMinus:
return "-";
case jpiMul:
return "*";
@ -783,26 +783,26 @@ jspOperationName(JsonPathItemType type)
return "/";
case jpiMod:
return "%";
case jpiStartsWith:
return "starts with";
case jpiLikeRegex:
return "like_regex";
case jpiType:
return "type";
case jpiSize:
return "size";
case jpiKeyValue:
return "keyvalue";
case jpiDouble:
return "double";
case jpiAbs:
return "abs";
case jpiFloor:
return "floor";
case jpiCeiling:
return "ceiling";
case jpiDouble:
return "double";
case jpiDatetime:
return "datetime";
case jpiKeyValue:
return "keyvalue";
case jpiStartsWith:
return "starts with";
case jpiLikeRegex:
return "like_regex";
default:
elog(ERROR, "unrecognized jsonpath item type: %d", type);
return NULL;
@ -900,8 +900,8 @@ jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
case jpiKeyValue:
case jpiLast:
break;
case jpiKey:
case jpiString:
case jpiKey:
case jpiVariable:
read_int32(v->content.value.datalen, base, pos);
/* FALLTHROUGH */
@ -911,30 +911,24 @@ jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
break;
case jpiAnd:
case jpiOr:
case jpiAdd:
case jpiSub:
case jpiMul:
case jpiDiv:
case jpiMod:
case jpiEqual:
case jpiNotEqual:
case jpiLess:
case jpiGreater:
case jpiLessOrEqual:
case jpiGreaterOrEqual:
case jpiAdd:
case jpiSub:
case jpiMul:
case jpiDiv:
case jpiMod:
case jpiStartsWith:
read_int32(v->content.args.left, base, pos);
read_int32(v->content.args.right, base, pos);
break;
case jpiLikeRegex:
read_int32(v->content.like_regex.flags, base, pos);
read_int32(v->content.like_regex.expr, base, pos);
read_int32(v->content.like_regex.patternlen, base, pos);
v->content.like_regex.pattern = base + pos;
break;
case jpiNot:
case jpiExists:
case jpiIsUnknown:
case jpiExists:
case jpiPlus:
case jpiMinus:
case jpiFilter:
@ -950,6 +944,12 @@ jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
read_int32(v->content.anybounds.first, base, pos);
read_int32(v->content.anybounds.last, base, pos);
break;
case jpiLikeRegex:
read_int32(v->content.like_regex.flags, base, pos);
read_int32(v->content.like_regex.expr, base, pos);
read_int32(v->content.like_regex.patternlen, base, pos);
v->content.like_regex.pattern = base + pos;
break;
default:
elog(ERROR, "unrecognized jsonpath item type: %d", v->type);
}
@ -958,12 +958,12 @@ jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
void
jspGetArg(JsonPathItem *v, JsonPathItem *a)
{
Assert(v->type == jpiFilter ||
v->type == jpiNot ||
Assert(v->type == jpiNot ||
v->type == jpiIsUnknown ||
v->type == jpiExists ||
v->type == jpiPlus ||
v->type == jpiMinus ||
v->type == jpiFilter ||
v->type == jpiExists ||
v->type == jpiDatetime);
jspInitByBuffer(a, v->base, v->content.arg);
@ -974,21 +974,20 @@ jspGetNext(JsonPathItem *v, JsonPathItem *a)
{
if (jspHasNext(v))
{
Assert(v->type == jpiString ||
Assert(v->type == jpiNull ||
v->type == jpiString ||
v->type == jpiNumeric ||
v->type == jpiBool ||
v->type == jpiNull ||
v->type == jpiKey ||
v->type == jpiAny ||
v->type == jpiAnyArray ||
v->type == jpiAnyKey ||
v->type == jpiIndexArray ||
v->type == jpiFilter ||
v->type == jpiCurrent ||
v->type == jpiExists ||
v->type == jpiRoot ||
v->type == jpiVariable ||
v->type == jpiLast ||
v->type == jpiAnd ||
v->type == jpiOr ||
v->type == jpiNot ||
v->type == jpiIsUnknown ||
v->type == jpiEqual ||
v->type == jpiNotEqual ||
v->type == jpiLess ||
v->type == jpiGreater ||
v->type == jpiLessOrEqual ||
v->type == jpiGreaterOrEqual ||
v->type == jpiAdd ||
v->type == jpiSub ||
v->type == jpiMul ||
@ -996,16 +995,16 @@ jspGetNext(JsonPathItem *v, JsonPathItem *a)
v->type == jpiMod ||
v->type == jpiPlus ||
v->type == jpiMinus ||
v->type == jpiEqual ||
v->type == jpiNotEqual ||
v->type == jpiGreater ||
v->type == jpiGreaterOrEqual ||
v->type == jpiLess ||
v->type == jpiLessOrEqual ||
v->type == jpiAnd ||
v->type == jpiOr ||
v->type == jpiNot ||
v->type == jpiIsUnknown ||
v->type == jpiAnyArray ||
v->type == jpiAnyKey ||
v->type == jpiIndexArray ||
v->type == jpiAny ||
v->type == jpiKey ||
v->type == jpiCurrent ||
v->type == jpiRoot ||
v->type == jpiVariable ||
v->type == jpiFilter ||
v->type == jpiExists ||
v->type == jpiType ||
v->type == jpiSize ||
v->type == jpiAbs ||
@ -1014,6 +1013,7 @@ jspGetNext(JsonPathItem *v, JsonPathItem *a)
v->type == jpiDouble ||
v->type == jpiDatetime ||
v->type == jpiKeyValue ||
v->type == jpiLast ||
v->type == jpiStartsWith ||
v->type == jpiLikeRegex);

338
src/backend/utils/adt/jsonpath_exec.c
View File

@ -621,6 +621,37 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
switch (jsp->type)
{
case jpiNull:
case jpiBool:
case jpiNumeric:
case jpiString:
case jpiVariable:
{
JsonbValue vbuf;
JsonbValue *v;
bool hasNext = jspGetNext(jsp, &elem);
if (!hasNext && !found && jsp->type != jpiVariable)
{
/*
* Skip evaluation, but not for variables. We must
* trigger an error for the missing variable.
*/
res = jperOk;
break;
}
v = hasNext ? &vbuf : palloc(sizeof(*v));
baseObject = cxt->baseObject;
getJsonPathItem(cxt, jsp, v);
res = executeNextItem(cxt, jsp, &elem,
v, found, hasNext);
cxt->baseObject = baseObject;
}
break;
/* all boolean item types: */
case jpiAnd:
case jpiOr:
@ -642,63 +673,32 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
break;
}
case jpiKey:
if (JsonbType(jb) == jbvObject)
{
JsonbValue *v;
JsonbValue key;
case jpiAdd:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_add_opt_error, found);
key.type = jbvString;
key.val.string.val = jspGetString(jsp, &key.val.string.len);
case jpiSub:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_sub_opt_error, found);
v = findJsonbValueFromContainer(jb->val.binary.data,
JB_FOBJECT, &key);
case jpiMul:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_mul_opt_error, found);
if (v != NULL)
{
res = executeNextItem(cxt, jsp, NULL,
v, found, false);
case jpiDiv:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_div_opt_error, found);
/* free value if it was not added to found list */
if (jspHasNext(jsp) || !found)
pfree(v);
}
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
case jpiMod:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_mod_opt_error, found);
if (!jspThrowErrors(cxt))
return jperError;
case jpiPlus:
return executeUnaryArithmExpr(cxt, jsp, jb, NULL, found);
ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_MEMBER_NOT_FOUND), \
errmsg("JSON object does not contain key \"%s\"",
pnstrdup(key.val.string.val,
key.val.string.len))));
}
}
else if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found, false);
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
RETURN_ERROR(ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_MEMBER_NOT_FOUND),
errmsg("jsonpath member accessor can only be applied to an object"))));
}
break;
case jpiRoot:
jb = cxt->root;
baseObject = setBaseObject(cxt, jb, 0);
res = executeNextItem(cxt, jsp, NULL, jb, found, true);
cxt->baseObject = baseObject;
break;
case jpiCurrent:
res = executeNextItem(cxt, jsp, NULL, cxt->current,
found, true);
break;
case jpiMinus:
return executeUnaryArithmExpr(cxt, jsp, jb, numeric_uminus,
found);
case jpiAnyArray:
if (JsonbType(jb) == jbvArray)
@ -716,6 +716,30 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
errmsg("jsonpath wildcard array accessor can only be applied to an array"))));
break;
case jpiAnyKey:
if (JsonbType(jb) == jbvObject)
{
bool hasNext = jspGetNext(jsp, &elem);
if (jb->type != jbvBinary)
elog(ERROR, "invalid jsonb object type: %d", jb->type);
return executeAnyItem
(cxt, hasNext ? &elem : NULL,
jb->val.binary.data, found, 1, 1, 1,
false, jspAutoUnwrap(cxt));
}
else if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found, false);
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
RETURN_ERROR(ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_OBJECT_NOT_FOUND),
errmsg("jsonpath wildcard member accessor can only be applied to an object"))));
}
break;
case jpiIndexArray:
if (JsonbType(jb) == jbvArray || jspAutoWrap(cxt))
{
@ -822,103 +846,6 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
}
break;
case jpiLast:
{
JsonbValue tmpjbv;
JsonbValue *lastjbv;
int last;
bool hasNext = jspGetNext(jsp, &elem);
if (cxt->innermostArraySize < 0)
elog(ERROR, "evaluating jsonpath LAST outside of array subscript");
if (!hasNext && !found)
{
res = jperOk;
break;
}
last = cxt->innermostArraySize - 1;
lastjbv = hasNext ? &tmpjbv : palloc(sizeof(*lastjbv));
lastjbv->type = jbvNumeric;
lastjbv->val.numeric = int64_to_numeric(last);
res = executeNextItem(cxt, jsp, &elem,
lastjbv, found, hasNext);
}
break;
case jpiAnyKey:
if (JsonbType(jb) == jbvObject)
{
bool hasNext = jspGetNext(jsp, &elem);
if (jb->type != jbvBinary)
elog(ERROR, "invalid jsonb object type: %d", jb->type);
return executeAnyItem
(cxt, hasNext ? &elem : NULL,
jb->val.binary.data, found, 1, 1, 1,
false, jspAutoUnwrap(cxt));
}
else if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found, false);
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
RETURN_ERROR(ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_OBJECT_NOT_FOUND),
errmsg("jsonpath wildcard member accessor can only be applied to an object"))));
}
break;
case jpiAdd:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_add_opt_error, found);
case jpiSub:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_sub_opt_error, found);
case jpiMul:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_mul_opt_error, found);
case jpiDiv:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_div_opt_error, found);
case jpiMod:
return executeBinaryArithmExpr(cxt, jsp, jb,
numeric_mod_opt_error, found);
case jpiPlus:
return executeUnaryArithmExpr(cxt, jsp, jb, NULL, found);
case jpiMinus:
return executeUnaryArithmExpr(cxt, jsp, jb, numeric_uminus,
found);
case jpiFilter:
{
JsonPathBool st;
if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found,
false);
jspGetArg(jsp, &elem);
st = executeNestedBoolItem(cxt, &elem, jb);
if (st != jpbTrue)
res = jperNotFound;
else
res = executeNextItem(cxt, jsp, NULL,
jb, found, true);
break;
}
case jpiAny:
{
bool hasNext = jspGetNext(jsp, &elem);
@ -949,37 +876,82 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
break;
}
case jpiNull:
case jpiBool:
case jpiNumeric:
case jpiString:
case jpiVariable:
case jpiKey:
if (JsonbType(jb) == jbvObject)
{
JsonbValue vbuf;
JsonbValue *v;
bool hasNext = jspGetNext(jsp, &elem);
JsonbValue key;
if (!hasNext && !found && jsp->type != jpiVariable)
key.type = jbvString;
key.val.string.val = jspGetString(jsp, &key.val.string.len);
v = findJsonbValueFromContainer(jb->val.binary.data,
JB_FOBJECT, &key);
if (v != NULL)
{
/*
* Skip evaluation, but not for variables. We must
* trigger an error for the missing variable.
*/
res = jperOk;
break;
res = executeNextItem(cxt, jsp, NULL,
v, found, false);
/* free value if it was not added to found list */
if (jspHasNext(jsp) || !found)
pfree(v);
}
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
v = hasNext ? &vbuf : palloc(sizeof(*v));
if (!jspThrowErrors(cxt))
return jperError;
baseObject = cxt->baseObject;
getJsonPathItem(cxt, jsp, v);
res = executeNextItem(cxt, jsp, &elem,
v, found, hasNext);
cxt->baseObject = baseObject;
ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_MEMBER_NOT_FOUND), \
errmsg("JSON object does not contain key \"%s\"",
pnstrdup(key.val.string.val,
key.val.string.len))));
}
}
else if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found, false);
else if (!jspIgnoreStructuralErrors(cxt))
{
Assert(found);
RETURN_ERROR(ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_MEMBER_NOT_FOUND),
errmsg("jsonpath member accessor can only be applied to an object"))));
}
break;
case jpiCurrent:
res = executeNextItem(cxt, jsp, NULL, cxt->current,
found, true);
break;
case jpiRoot:
jb = cxt->root;
baseObject = setBaseObject(cxt, jb, 0);
res = executeNextItem(cxt, jsp, NULL, jb, found, true);
cxt->baseObject = baseObject;
break;
case jpiFilter:
{
JsonPathBool st;
if (unwrap && JsonbType(jb) == jbvArray)
return executeItemUnwrapTargetArray(cxt, jsp, jb, found,
false);
jspGetArg(jsp, &elem);
st = executeNestedBoolItem(cxt, &elem, jb);
if (st != jpbTrue)
res = jperNotFound;
else
res = executeNextItem(cxt, jsp, NULL,
jb, found, true);
break;
}
case jpiType:
{
JsonbValue *jbv = palloc(sizeof(*jbv));
@ -1110,6 +1082,34 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
return executeKeyValueMethod(cxt, jsp, jb, found);
case jpiLast:
{
JsonbValue tmpjbv;
JsonbValue *lastjbv;
int last;
bool hasNext = jspGetNext(jsp, &elem);
if (cxt->innermostArraySize < 0)
elog(ERROR, "evaluating jsonpath LAST outside of array subscript");
if (!hasNext && !found)
{
res = jperOk;
break;
}
last = cxt->innermostArraySize - 1;
lastjbv = hasNext ? &tmpjbv : palloc(sizeof(*lastjbv));
lastjbv->type = jbvNumeric;
lastjbv->val.numeric = int64_to_numeric(last);
res = executeNextItem(cxt, jsp, &elem,
lastjbv, found, hasNext);
}
break;
default:
elog(ERROR, "unrecognized jsonpath item type: %d", jsp->type);
}

7
src/include/utils/jsonpath.h
View File

@ -49,6 +49,13 @@ DatumGetJsonPathPCopy(Datum d)
/*
* All node's type of jsonpath expression
*
* These become part of the on-disk representation of the jsonpath type.
* Therefore, to preserve pg_upgradability, the order must not be changed, and
* new values must be added at the end.
*
* It is recommended that switch cases etc. in other parts of the code also
* use this order, to maintain some consistency.
*/
typedef enum JsonPathItemType
{