***************   Case 1   ***************
create synonym syn_t1 for t1;
{
  "create_synonym_arg": {
    "synonym_info": {
      "tenant_id":1,
      "database_id":-1,
      "synonym_id":-1,
      "schema_version":0
    },
    "db_name":"rongxuan",
    "obj_db_name":"rongxuan"
  }
}
***************   Case 2   ***************
select * from t1;
{
  "stmt_type":1,
  "table": [
     {
      "table_id":1099511677777,
      "table_name":"t1",
      "alias_name":"",
      "table_type":0,
      "ref_id":1099511677777,
      "database_name":"rongxuan",
      "for_update":false,
      "wait":-1,
      "mock_id":-1
    }
  ],
  "joined_table": [
  ],
  "partition_express": [
     {
      "table_id":1099511677777,
      "partition_express": {
        "item_type":"T_OP_ADD",
        "result_type": {
          "meta": {
            "type":"BIGINT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          },
          "accuracy": {
            "length":-1,
            "precision":12,
            "scale":0
          },
          "flag":1,
          "calc_type": {
            "type":"BIGINT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          }
        },
        "expr_info": [
          "CNT_CONST",
          "CNT_COLUMN"
        ],
        "rel_id": [
        ],
        "expr_levels": [
        ],
        "children": [
           {
            "item_type":"T_REF_COLUMN",
            "result_type": {
              "meta": {
                "type":"INT",
                "collation":"binary",
                "coercibility":"NUMERIC"
              },
              "accuracy": {
                "length":-1,
                "precision":11,
                "scale":0
              },
              "flag":16387,
              "calc_type": {
                "type":"NULL",
                "collation":"invalid_type",
                "coercibility":"INVALID"
              }
            },
            "expr_info": [
              "IS_COLUMN",
              "CNT_COLUMN"
            ],
            "rel_id": [
              1
            ],
            "table_id":1099511677777,
            "column_id":16,
            "database_name":"rongxuan",
            "table_name":"t1",
            "column_name":"c1",
            "expr_level":0,
            "expr_levels": [
              0
            ],
            "column_flags":0,
            "is_explicited_referece":true,
            "explicited_ref_count":1
          },
           {
            "item_type":"T_INT",
            "result_type": {
              "meta": {
                "type":"BIGINT",
                "collation":"binary",
                "coercibility":"NUMERIC"
              },
              "accuracy": {
                "length":1,
                "precision":1,
                "scale":0
              },
              "flag":1,
              "calc_type": {
                "type":"NULL",
                "collation":"invalid_type",
                "coercibility":"INVALID"
              }
            },
            "expr_info": [
              "IS_CONST",
              "CNT_CONST"
            ],
            "rel_id": [
            ],
            "value": {
              "BIGINT":1
            }
          }
        ]
      },
      "partition_express":null
    }
  ],
  "column": [
     {
      "column_id":16,
      "table_id":1099511677777,
      "column":"c1",
      "auto_filled_timestamp":false,
      "default_value": {
        "NULL":"NULL"
      },
      "expression": {
        "item_type":"T_REF_COLUMN",
        "result_type": {
          "meta": {
            "type":"INT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          },
          "accuracy": {
            "length":-1,
            "precision":11,
            "scale":0
          },
          "flag":16387,
          "calc_type": {
            "type":"NULL",
            "collation":"invalid_type",
            "coercibility":"INVALID"
          }
        },
        "expr_info": [
          "IS_COLUMN",
          "CNT_COLUMN"
        ],
        "rel_id": [
          1
        ],
        "table_id":1099511677777,
        "column_id":16,
        "database_name":"rongxuan",
        "table_name":"t1",
        "column_name":"c1",
        "expr_level":0,
        "expr_levels": [
          0
        ],
        "column_flags":0,
        "is_explicited_referece":true,
        "explicited_ref_count":1
      }
    },
     {
      "column_id":17,
      "table_id":1099511677777,
      "column":"c2",
      "auto_filled_timestamp":false,
      "default_value": {
        "NULL":"NULL"
      },
      "expression": {
        "item_type":"T_REF_COLUMN",
        "result_type": {
          "meta": {
            "type":"INT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          },
          "accuracy": {
            "length":-1,
            "precision":11,
            "scale":0
          },
          "flag":0,
          "calc_type": {
            "type":"NULL",
            "collation":"invalid_type",
            "coercibility":"INVALID"
          }
        },
        "expr_info": [
          "IS_COLUMN",
          "CNT_COLUMN"
        ],
        "rel_id": [
          1
        ],
        "table_id":1099511677777,
        "column_id":17,
        "database_name":"rongxuan",
        "table_name":"t1",
        "column_name":"c2",
        "expr_level":0,
        "expr_levels": [
          0
        ],
        "column_flags":0,
        "is_explicited_referece":true,
        "explicited_ref_count":1
      }
    }
  ],
  "select": [
     {
      "expression": {
        "item_type":"T_REF_COLUMN",
        "result_type": {
          "meta": {
            "type":"INT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          },
          "accuracy": {
            "length":-1,
            "precision":11,
            "scale":0
          },
          "flag":16387,
          "calc_type": {
            "type":"NULL",
            "collation":"invalid_type",
            "coercibility":"INVALID"
          }
        },
        "expr_info": [
          "IS_COLUMN",
          "CNT_COLUMN"
        ],
        "rel_id": [
          1
        ],
        "table_id":1099511677777,
        "column_id":16,
        "database_name":"rongxuan",
        "table_name":"t1",
        "column_name":"c1",
        "expr_level":0,
        "expr_levels": [
          0
        ],
        "column_flags":0,
        "is_explicited_referece":true,
        "explicited_ref_count":1
      },
      "is_alias":false,
      "alias_name":"c1",
      "expr_name":"c1",
      "default": {
        "NULL":"NULL"
      }
    },
     {
      "expression": {
        "item_type":"T_REF_COLUMN",
        "result_type": {
          "meta": {
            "type":"INT",
            "collation":"binary",
            "coercibility":"NUMERIC"
          },
          "accuracy": {
            "length":-1,
            "precision":11,
            "scale":0
          },
          "flag":0,
          "calc_type": {
            "type":"NULL",
            "collation":"invalid_type",
            "coercibility":"INVALID"
          }
        },
        "expr_info": [
          "IS_COLUMN",
          "CNT_COLUMN"
        ],
        "rel_id": [
          1
        ],
        "table_id":1099511677777,
        "column_id":17,
        "database_name":"rongxuan",
        "table_name":"t1",
        "column_name":"c2",
        "expr_level":0,
        "expr_levels": [
          0
        ],
        "column_flags":0,
        "is_explicited_referece":true,
        "explicited_ref_count":1
      },
      "is_alias":false,
      "alias_name":"c2",
      "expr_name":"c2",
      "default": {
        "NULL":"NULL"
      }
    }
  ],
  "distinct":false,
  "rollup":false,
  "nocycle":false,
  "from": [
     {
      "table_id":1099511677777,
      "is_join":false
    }
  ],
  "start_with": [
  ],
  "connect_by": [
  ],
  "where": [
  ],
  "group_by": [
  ],
  "having": [
  ],
  "aggr_func": [
  ],
  "order_by": [
  ],
  "limit":null,
  "offset":null,
  "show_stmt_ctx": {
    "is_from_show_stmt":false,
    "global_scope":false,
    "tenant_id":-1,
    "show_database_id":-1,
    "show_table_id":-1,
    "grants_user_id":-1
  },
  "hint": {
    "read_static":false,
    "no_rewrite":false,
    "frozen_version":-1,
    "topk_precision":-1,
    "sharding_minimum_row_count":0,
    "query_timeout":-1,
    "hotspot":false,
    "index": [
    ],
    "read_consistency":-1,
    "join_ordered":false,
    "join_order": [
    ],
    "merge_hint_ids": [
    ],
    "hash_hint_ids": [
    ],
    "no_hash_hint_ids": [
    ],
    "nl_hint_ids": [
    ],
    "part_hints": [
    ],
    "use_late_materialization":-1,
    "log_level":"",
    "max_concurrent":-1,
    "only_concurrent_hint":false,
    "has_hint_exclude_concurrent":false,
    "parallel":-1
  },
  "query_context": {
    "param_num":0,
    "fetch_cur_time":true,
    "calculable_items": [
    ]
  },
  "extra_output_exprs": [
  ],
  "current_level":0,
  "equal_sets": [
  ],
  "child_stmts": [
  ],
  "has_transformed_for_hierarchical_query":false,
  "is_hierarchical_query":false
}
***************   Case 3   ***************
select * from syn_t1;