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{
"name": "count",
"type": "function",
"description": "Returns the count of matching features.",
"arguments": [
{"arg":"expression", "description":"sub expression of field to aggregate"},
{"arg":"group_by", "optional":true, "description":"optional expression to use to group aggregate calculations"},
{"arg":"filter", "optional":true, "description":"optional expression to use to filter features used to calculate aggregate"}
],
"examples": [
{ "expression":"count(\"stations\",group_by:=\"state\")", "returns":"count of stations, grouped by state field"}
]
}