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SQL/JSON: Improve some error messages

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This improves some error messages emitted by SQL/JSON query functions
by mentioning column name when available, such as when they are
invoked as part of evaluating JSON_TABLE() columns.  To do so, a new
field column_name is added to both JsonFuncExpr and JsonExpr that is
only populated when creating those nodes for transformed JSON_TABLE()
columns.

While at it, relevant error messages are reworded for clarity.

Reported-by: Jian He <jian.universality@gmail.com>
Suggested-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CACJufxG_e0QLCgaELrr2ZNz7AxPeGCNKAORe3fHtFCQLsH4J4Q@mail.gmail.com
This commit is contained in:
Amit Langote
2024-04-18 14:33:47 +09:00
parent 40126ac68f
commit b4fad46b6b
10 changed files with 100 additions and 61 deletions
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45
src/backend/utils/adt/jsonpath_exec.c
View File

@ -3899,7 +3899,8 @@ JsonPathExists(Datum jb, JsonPath *jp, bool *error, List *vars)
*/
Datum
JsonPathQuery(Datum jb, JsonPath *jp, JsonWrapper wrapper, bool *empty,
bool *error, List *vars)
bool *error, List *vars,
const char *column_name)
{
JsonbValue *singleton;
bool wrap;
@ -3950,10 +3951,17 @@ JsonPathQuery(Datum jb, JsonPath *jp, JsonWrapper wrapper, bool *empty,
return (Datum) 0;
}
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression in JSON_QUERY should return singleton item without wrapper"),
errhint("Use WITH WRAPPER clause to wrap SQL/JSON item sequence into array.")));
if (column_name)
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression for column \"%s\" should return single item without wrapper",
column_name),
errhint("Use WITH WRAPPER clause to wrap SQL/JSON items into array.")));
else
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression in JSON_QUERY should return single item without wrapper"),
errhint("Use WITH WRAPPER clause to wrap SQL/JSON items into array.")));
}
if (singleton)
@ -3970,7 +3978,8 @@ JsonPathQuery(Datum jb, JsonPath *jp, JsonWrapper wrapper, bool *empty,
* *error to true. *empty is set to true if no match is found.
*/
JsonbValue *
JsonPathValue(Datum jb, JsonPath *jp, bool *empty, bool *error, List *vars)
JsonPathValue(Datum jb, JsonPath *jp, bool *empty, bool *error, List *vars,
const char *column_name)
{
JsonbValue *res;
JsonValueList found = {0};
@ -4006,9 +4015,15 @@ JsonPathValue(Datum jb, JsonPath *jp, bool *empty, bool *error, List *vars)
return NULL;
}
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression in JSON_VALUE should return singleton scalar item")));
if (column_name)
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression for column \"%s\" should return single scalar item",
column_name)));
else
ereport(ERROR,
(errcode(ERRCODE_MORE_THAN_ONE_SQL_JSON_ITEM),
errmsg("JSON path expression in JSON_VALUE should return single scalar item")));
}
res = JsonValueListHead(&found);
@ -4024,9 +4039,15 @@ JsonPathValue(Datum jb, JsonPath *jp, bool *empty, bool *error, List *vars)
return NULL;
}
ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_SCALAR_REQUIRED),
errmsg("JSON path expression in JSON_VALUE should return singleton scalar item")));
if (column_name)
ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_SCALAR_REQUIRED),
errmsg("JSON path expression for column \"%s\" should return single scalar item",
column_name)));
else
ereport(ERROR,
(errcode(ERRCODE_SQL_JSON_SCALAR_REQUIRED),
errmsg("JSON path expression in JSON_VALUE should return single scalar item")));
}
if (res->type == jbvNull)