Execute an ad-hoc query (complex)

{
  "result": [
    {
      "id": "example2",
      "raw": "package opa.examples\\n\\nimport data.servers\\n\\nviolations[server] {\\n\\tserver = servers[_]\\n\\tserver.protocols[_] = \\\"http\\\"\\n\\tpublic_servers[server]\\n}\\n",
      "ast": {
        "package": {
          "path": [
            {
              "type": "import",
              "value": "data.opa.example"
            }
          ]
        },
        "rules": [
          {
            "head": {
              "name": "violations",
              "key": {
                "type": "var",
                "value": "$0"
              }
            },
            "body": [
              {
                "index": 1,
                "terms": [
                  {
                    "type": "var"
                  }
                ]
              }
            ]
          }
        ]
      }
    }
  ],
  "metrics": {
    "timer_rego_input_parse_ns": 69994,
    "timer_rego_query_parse_ns": 4096,
    "timer_rego_query_compile_ns": 4096,
    "timer_rego_query_eval_ns": 69994,
    "timer_rego_module_parse_ns": 12345,
    "timer_rego_module_compile_ns": 69994,
    "timer_server_handler_ns": 631000,
    "timer_server_read_bytes_ns": 631000,
    "timer_query_compile_stage_build_comprehension_index_ns": 43000,
    "timer_query_compile_stage_check_safety_ns": 852000,
    "timer_query_compile_stage_check_types_ns": 577000,
    "timer_query_compile_stage_check_undefined_funcs_ns": 426000,
    "timer_query_compile_stage_check_unsafe_builtins_ns": 14000,
    "timer_query_compile_stage_resolve_refs_ns": 3000,
    "timer_query_compile_stage_rewrite_comprehension_terms_ns": 329000,
    "timer_query_compile_stage_rewrite_dynamic_terms_ns": 27000,
    "timer_query_compile_stage_rewrite_expr_terms_ns": 40000,
    "timer_query_compile_stage_rewrite_local_vars_ns": 187000,
    "timer_query_compile_stage_rewrite_to_capture_value_ns": 1178000,
    "timer_query_compile_stage_rewrite_with_values_ns": 23000
  },
  "explanation": [
    {
      "op": "enter",
      "type": "expr",
      "node": {
        "terms": [
          {
            "type": "var",
            "value": "$term1"
          }
        ]
      }
    }
  ]
}