[BUG]json_data->>'$.column' AS column

[zhwm12]

luckysheet-mysql\src\main\java\com\xc\luckysheet\mysql\impl\RecordSelectHandle.java
public JSONObject getCelldataByGridKey(String listId, String index, String blockId) {
............
String sql="select index,json_data->>'$.celldata' AS celldata,json_data->>'$.column' AS column,json_data->>'$.row' AS row from "+JfGridConfigModel.TABLENAME+" p where p.list_id=? and p.index=? and p.block_id=? and p.is_delete=0 ORDER BY p.id DESC LIMIT 1 ";
Map<String, Object> map= luckySheetJdbcTemplate.queryForMap(sql, new Object[]{listId,index,blockId});
............
}
DataTable sheet [docssheet ] fields：id,block_id,row_col,index,list_id,status,order,json_data,is_delete
json_data : {"celldata": [{"c": 6, "r": 30, "v": {"m": "l", "v": "l", "ct": {"t": "g", "fa": "General"}}}]}

Mysql:
select id,index,json_data->>'$.celldata' AS celldata,json_data->>'$.column' AS column,json_data->>'$.row' AS row from docssheet p where p.list_id='45794d3ceb1f0054a2b6d47b0ac82212' and p.index='Sheet_6aokgc2qSWWH20210505161959' and p.block_id='30_6' and p.is_delete=0 ORDER BY p.id DESC LIMIT 1 ;
Query Result:
id :183152282723028992
index :Sheet_6aokgc2qSWWH20210505161959
celldata:[{"c": 6, "r": 30, "v": {"m": "l", "v": "l", "ct": {"t": "g", "fa": "General"}}}]
column: (NULL)
row : (NULL)

Map<String, Object> map= luckySheetJdbcTemplate.queryForMap(sql, new Object[]{listId,index,blockId});
ERROR Incorrect result size: expected 1, actual 0

problem 1: json_data->>'$.column' Or json_data->>'$.c' ?
problem 2: record count 1; but warning ERROR Incorrect result size: expected 1, actual 0 ?