Major Description
Need the user interface for user to define the TopN. User need to selecting: 1) the metrics column; 2) the literal column;
This is a sample:
{
"name" : "TOP_SELLER",
"function" : {
"expression" : "TOP_N",
"parameter" : {
"type" : "column",
"value" : "PRICE",
"next_parameter" : {
"type" : "column",
"value" : "SELLER_ID",
"next_parameter" : null
}
},
"returntype" : "topn(100)"
}
}