GroupByStage

Aggregate by key. agg entries are aggregate expressions (SUM(x)).

opOp (string)required

Constant value: group_by

bystring[]required

agg object[]required

Array [

nameName (string)required

Output column name

exprExpr (string)required

Polars-SQL expression, e.g. 'qty * unit_price'

]

GroupByStage

{
  "op": "group_by",
  "by": [
    "string"
  ],
  "agg": [
    {
      "name": "string",
      "expr": "string"
    }
  ]
}