Improve error reporting for jsonpath .double() method

akorotkov · akorotkov · commit 3ec5f6b53dfb · 2020-07-11T03:21:53.000+03:00
When jsonpath .double() method detects that numeric or string can't be converted to double precision, it throws an error. This commit makes these errors explicitly express the reason of failure. Discussion: https://postgr.es/m/CAPpHfdtqJtiSXkP7tOXez18NxhLUH_-75bL8%3DOce4Ki%2Bbv7V6Q%40mail.gmail.com Author: Alexander Korotkov Reviewed-by: Tom Lane Backpatch-through: 12
diff --git a/src/backend/utils/adt/jsonpath_exec.c b/src/backend/utils/adt/jsonpath_exec.c
@@ -986,7 +986,7 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
 					if (have_error)
 						RETURN_ERROR(ereport(ERROR,
 											 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
-											  errmsg("jsonpath item method .%s() can only be applied to a numeric value",
+											  errmsg("numeric argument of jsonpath item method .%s() is out of range for type double precision",
 													 jspOperationName(jsp->type)))));
 					res = jperOk;
 				}
@@ -1007,7 +1007,7 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
 					if (have_error || isinf(val))
 						RETURN_ERROR(ereport(ERROR,
 											 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
-											  errmsg("jsonpath item method .%s() can only be applied to a numeric value",
+											  errmsg("string argument of jsonpath item method .%s() is not a valid representation of a double precision number",
 													 jspOperationName(jsp->type)))));
 
 					jb = &jbv;
diff --git a/src/test/regress/expected/jsonb_jsonpath.out b/src/test/regress/expected/jsonb_jsonpath.out
@@ -1496,7 +1496,9 @@ select jsonb_path_query('"1.23"', '$.double()');
 (1 row)
 
 select jsonb_path_query('"1.23aaa"', '$.double()');
-ERROR:  jsonpath item method .double() can only be applied to a numeric value
+ERROR:  string argument of jsonpath item method .double() is not a valid representation of a double precision number
+select jsonb_path_query('1e1000', '$.double()');
+ERROR:  numeric argument of jsonpath item method .double() is out of range for type double precision
 select jsonb_path_query('"nan"', '$.double()');
  jsonb_path_query 
 ------------------
@@ -1510,9 +1512,9 @@ select jsonb_path_query('"NaN"', '$.double()');
 (1 row)
 
 select jsonb_path_query('"inf"', '$.double()');
-ERROR:  jsonpath item method .double() can only be applied to a numeric value
+ERROR:  string argument of jsonpath item method .double() is not a valid representation of a double precision number
 select jsonb_path_query('"-inf"', '$.double()');
-ERROR:  jsonpath item method .double() can only be applied to a numeric value
+ERROR:  string argument of jsonpath item method .double() is not a valid representation of a double precision number
 select jsonb_path_query('"inf"', '$.double()', silent => true);
  jsonb_path_query 
 ------------------
diff --git a/src/test/regress/sql/jsonb_jsonpath.sql b/src/test/regress/sql/jsonb_jsonpath.sql
@@ -312,6 +312,7 @@ select jsonb_path_query('{}', '$.double()', silent => true);
 select jsonb_path_query('1.23', '$.double()');
 select jsonb_path_query('"1.23"', '$.double()');
 select jsonb_path_query('"1.23aaa"', '$.double()');
+select jsonb_path_query('1e1000', '$.double()');
 select jsonb_path_query('"nan"', '$.double()');
 select jsonb_path_query('"NaN"', '$.double()');
 select jsonb_path_query('"inf"', '$.double()');
