【解决办法】
使用参考：
{
"getFeatureMode": "SQL",
"datasetNames": [
"ChengduFresh:成都市"
],
"maxFeatures": 1000,
"queryParameter": {
"sortClause": null,
"ids": null,
"name": null,
"attributeFilter": "SMID>0",
"groupClause": null,
"linkItems": null,
"joinItems": null,
"fields": [
"NAME", "SUM(SMAREA) AS MYCOUNT",
"SUM(CASE WHEN SMAREA < 100000000 THEN SMAREA ELSE 0 END) AS AREA_BELOW_100000000"
],
"groupBy": "NAME"
}
}
