Get the number of distinct values of a field
Get the number of distinct values (cardinal) of a field by using the GetCardinal method.
Example
The handle of the request is 2 because the handle of the field is 2.
The client sends:
{
"jsonrpc": "2.0",
"id": 2,
"method": "GetCardinal",
"handle": 2,
"params": []
}
The engine returns:
{
"jsonrpc": "2.0",
"id": 2,
"result": {
"qReturn": 22
}
}
The number of distinct values of the field is 22.
