{
  "graph_version": "0.2",
  "request": "Which region has the most customers?",
  "evidence": "",
  "nodes": [
    {
      "node_id": "region",
      "kind": "attribute",
      "concept": "region",
      "spans": [{"source": "request", "start": 6, "end": 12, "text": "region"}],
      "schema_candidates": ["regions.name", "customers.region_id"]
    },
    {
      "node_id": "customers",
      "kind": "entity",
      "concept": "customer",
      "spans": [{"source": "request", "start": 26, "end": 35, "text": "customers"}],
      "schema_candidates": ["customers"]
    },
    {
      "node_id": "customer_count",
      "kind": "operation",
      "concept": "count",
      "spans": [{"source": "request", "start": 21, "end": 35, "text": "most customers"}],
      "schema_candidates": ["customers.id"],
      "attributes": {"distinct": false}
    },
    {
      "node_id": "largest_group",
      "kind": "operation",
      "concept": "argmax",
      "spans": [{"source": "request", "start": 21, "end": 25, "text": "most"}],
      "attributes": {"limit": 1}
    },
    {
      "node_id": "answer",
      "kind": "output",
      "concept": "answer"
    }
  ],
  "edges": [
    {"source": "customer_count", "role": "theme", "target": "customers"},
    {"source": "customer_count", "role": "group_by", "target": "region"},
    {"source": "largest_group", "role": "measure", "target": "customer_count"},
    {"source": "answer", "role": "returns", "target": "region"},
    {"source": "answer", "role": "constrained_by", "target": "largest_group"}
  ]
}