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MDEV-17121 JSON_ARRAY_APPEND.

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Extra comma added to the result when an json array is empty.
This commit is contained in:
Alexey Botchkov 2018-09-11 14:37:45 +04:00
parent 4d9ec7cb6c
commit c8bb43a938
5 changed files with 48 additions and 2 deletions
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6
include/json_lib.h
View file

@ -319,6 +319,12 @@ int json_skip_to_level(json_engine_t *j, int level);
json_skip_to_level((json_engine), (json_engine)->stack_p)
/*
works as json_skip_level() but also counts items on the current
level skipped.
*/
int json_skip_level_and_count(json_engine_t *j, int *n_items_skipped);
#define json_skip_array_item json_skip_key
/*

6
mysql-test/r/func_json.result
View file

@ -790,3 +790,9 @@ JSON_SET('{}', '$.a', _utf8 0xC3B6, '$.b', _utf8 0xC3B6)
SELECT JSON_SET('{}', '$.a', _utf8 X'C3B6', '$.x', 1, '$.b', _utf8 X'C3B6');
JSON_SET('{}', '$.a', _utf8 X'C3B6', '$.x', 1, '$.b', _utf8 X'C3B6')
{"a": "ö", "x": 1, "b": "ö"}
#
# MDEV-17121 JSON_ARRAY_APPEND
#
select json_array_append('[ ]', '$', 'aue');
json_array_append('[ ]', '$', 'aue')
["aue"]

7
mysql-test/t/func_json.test
View file

@ -448,3 +448,10 @@ SELECT JSON_SET('{}', '$.a', _utf8 0xC3B6);
SELECT JSON_SET('{}', '$.a', _utf8 0xC3B6, '$.b', _utf8 0xC3B6);
SELECT JSON_SET('{}', '$.a', _utf8 X'C3B6', '$.x', 1, '$.b', _utf8 X'C3B6');
--echo #
--echo # MDEV-17121 JSON_ARRAY_APPEND
--echo #
select json_array_append('[ ]', '$', 'aue');

4
sql/item_jsonfunc.cc
View file

@ -1621,12 +1621,14 @@ String *Item_func_json_array_append::val_str(String *str)
if (je.value_type == JSON_VALUE_ARRAY)
{
if (json_skip_level(&je))
int n_items;
if (json_skip_level_and_count(&je, &n_items))
goto js_error;
ar_end= je.s.c_str - je.sav_c_len;
str_rest_len= js->length() - (ar_end - (const uchar *) js->ptr());
str->q_append(js->ptr(), ar_end-(const uchar *) js->ptr());
if (n_items)
str->append(", ", 2);
if (append_json_value(str, args[n_arg+1], &tmp_val))
goto return_null; /* Out of memory. */

25
strings/json_lib.c
View file

@ -1197,6 +1197,31 @@ int json_skip_to_level(json_engine_t *j, int level)
}
#define json_skip_level(json_engine) \
json_skip_to_level((json_engine), (json_engine)->stack_p)
/*
works as json_skip_level() but also counts items on the current
level skipped.
*/
int json_skip_level_and_count(json_engine_t *j, int *n_items_skipped)
{
int level= j->stack_p;
*n_items_skipped= 0;
while (json_scan_next(j) == 0)
{
if (j->stack_p < level)
return 0;
if (j->stack_p == level && j->state == JST_VALUE)
(*n_items_skipped)++;
}
return 1;
}
int json_skip_key(json_engine_t *j)
{
if (json_read_value(j))