vitess.io/vitess@v0.16.2/go/vt/vtgate/planbuilder/testdata/select_cases_with_user_as_default.json (about)

     1  [
     2    {
     3      "comment": "EXISTS subquery",
     4      "query": "select exists(select * from user where id = 5)",
     5      "v3-plan": {
     6        "QueryType": "SELECT",
     7        "Original": "select exists(select * from user where id = 5)",
     8        "Instructions": {
     9          "OperatorType": "Route",
    10          "Variant": "EqualUnique",
    11          "Keyspace": {
    12            "Name": "user",
    13            "Sharded": true
    14          },
    15          "FieldQuery": "select exists (select 1 from `user` where 1 != 1) from dual where 1 != 1",
    16          "Query": "select exists (select 1 from `user` where id = 5 limit 1) from dual",
    17          "Table": "dual",
    18          "Values": [
    19            "INT64(5)"
    20          ],
    21          "Vindex": "user_index"
    22        }
    23      },
    24      "gen4-plan": {
    25        "QueryType": "SELECT",
    26        "Original": "select exists(select * from user where id = 5)",
    27        "Instructions": {
    28          "OperatorType": "Route",
    29          "Variant": "EqualUnique",
    30          "Keyspace": {
    31            "Name": "user",
    32            "Sharded": true
    33          },
    34          "FieldQuery": "select exists (select 1 from `user` where 1 != 1) from dual where 1 != 1",
    35          "Query": "select exists (select 1 from `user` where id = 5 limit 1) from dual",
    36          "Table": "dual",
    37          "Values": [
    38            "INT64(5)"
    39          ],
    40          "Vindex": "user_index"
    41        },
    42        "TablesUsed": [
    43          "user.dual",
    44          "user.user"
    45        ]
    46      }
    47    }
    48  ]