错误提示：

code="internalEror"Rendering process falled, Layers: boylat shp_ 1 org,postgresq!.ut.PsQLException: ERRoR: function upperjisonb) does not existHint: No function matches the given name and arqument types, You might need to add explicit type castsPosition:447ERROR: function upper(jsonb)does not existHint: No function matches the given name and arqument types, You might need to add explicit type casts.Position:447

解决办法：使用JsonPointer Function函数

//jsonb示例
{"name": "city name","description": "the city description","districts": [{"name": "district1","population": 2000},{"name": "district2","population": 5000}]"population":{"average_age": 35,"toal": 50000}
}

使用方法：

jsonPointer(city, '/name').
jsonPointer(city, '/population/average_age').
jsonPointer(city, '/districts/0/name').

在OGC过滤器中可以这样使用:

<Rule><Name>Cities</Name><ogc:Filter><ogc:PropertyIsEqualTo><ogc:Function name="jsonPointer"><ogc:PropertyName>city</ogc:PropertyName><ogc:Literal>/population/average_age</ogc:Literal></ogc:Function><ogc:Literal>35</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter><PointSymbolizer><Graphic><Mark><WellKnownName>square</WellKnownName><Fill><CssParameter name="fill">#FF0000</CssParameter></Fill></Mark><Size>16</Size>   </Graphic></PointSymbolizer>
</Rule>

参考文档：Geoserver官方文档
中文文档