{
    "num_rows_per_data_block": 1024,
    "file_version": [
        {
            "num_segments": 1,
            "start_version": 0,
            "end_version": 1,
            "version_hash": 0,
            "max_timestamp": 0,
            "index_size": 67,
            "data_size": 477,
            "num_rows": 0,
            "creation_time": 1534750461,
            "delta_pruning": {
                "column_pruning": [
                    {
                        "min": "OTk5OS0xMi0zMQ==",
                        "max": "MC0wMC0wMA==",
                        "null_flag": false
                    },
                    {
                        "min": "MjE0NzQ4MzY0Nw==",
                        "max": "MA==",
                        "null_flag": false
                    },
                    {
                        "min": "MzI3Njc=",
                        "max": "MA==",
                        "null_flag": false
                    },
                    {
                        "min": "/w==",
                        "max": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
                        "null_flag": false
                    }
                ]
            }
        },
        {
            "num_segments": 1,
            "start_version": 2,
            "end_version": 2,
            "version_hash": 0,
            "max_timestamp": 0,
            "index_size": 67,
            "data_size": 477,
            "num_rows": 0,
            "creation_time": 1534750461,
            "delta_pruning": {
                "column_pruning": [
                    {
                        "min": "OTk5OS0xMi0zMQ==",
                        "max": "MC0wMC0wMA==",
                        "null_flag": false
                    },
                    {
                        "min": "MjE0NzQ4MzY0Nw==",
                        "max": "MA==",
                        "null_flag": false
                    },
                    {
                        "min": "MzI3Njc=",
                        "max": "MA==",
                        "null_flag": false
                    },
                    {
                        "min": "/w==",
                        "max": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
                        "null_flag": false
                    }
                ]
            }
        }
    ],
    "cumulative_layer_point": 2,
    "num_short_key_fields": 4,
    "column": [
        {
            "name": "event_day",
            "type": "DATE",
            "aggregation": "NONE",
            "length": 3,
            "is_key": true,
            "index_length": 3,
            "is_allow_null": true,
            "unique_id": 0,
            "is_root_column": true
        },
        {
            "name": "siteid",
            "type": "INT",
            "aggregation": "NONE",
            "length": 4,
            "is_key": true,
            "default_value": "10",
            "index_length": 4,
            "is_allow_null": true,
            "unique_id": 1,
            "is_root_column": true
        },
        {
            "name": "citycode",
            "type": "SMALLINT",
            "aggregation": "NONE",
            "length": 2,
            "is_key": true,
            "index_length": 2,
            "is_allow_null": true,
            "unique_id": 2,
            "is_root_column": true
        },
        {
            "name": "username",
            "type": "VARCHAR",
            "aggregation": "NONE",
            "length": 34,
            "is_key": true,
            "default_value": "",
            "index_length": 20,
            "is_allow_null": true,
            "unique_id": 3,
            "is_root_column": true
        },
        {
            "name": "pv",
            "type": "BIGINT",
            "aggregation": "SUM",
            "length": 8,
            "is_key": false,
            "default_value": "0",
            "index_length": 8,
            "is_allow_null": true,
            "unique_id": 4,
            "is_root_column": true
        }
    ],
    "creation_time": 1534750461,
    "selectivity": [
        1,
        1,
        1,
        1
    ],
    "data_file_type": "COLUMN_ORIENTED_FILE",
    "next_column_unique_id": 5,
    "compress_kind": "COMPRESS_LZ4",
    "segment_size": 268435456,
    "keys_type": "AGG_KEYS",
    "tablet_id": 20487,
    "schema_hash": 1520686811,
    "shard": 0
}
