{
  "schema_name": "sample_index_parquet",
  "schema_version": 3,
  "artifact": "sample_index.parquet",
  "format": "parquet",
  "row_grain": "one row per WebDataset tar member",
  "description": "Physical lookup table for random access into uncompressed WebDataset tar shards. Semantic filtering lives in manifest.parquet.",
  "primary_key": [
    "sample_key",
    "resolution",
    "member_suffix"
  ],
  "columns": [
    {
      "name": "sample_key",
      "arrow_type": "string",
      "nullable": false
    },
    {
      "name": "match_id",
      "arrow_type": "string",
      "nullable": false
    },
    {
      "name": "round_id",
      "arrow_type": "string",
      "nullable": false
    },
    {
      "name": "round_idx",
      "arrow_type": "int32",
      "nullable": false
    },
    {
      "name": "pov_idx",
      "arrow_type": "int32",
      "nullable": false
    },
    {
      "name": "resolution",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "720p",
        "360p"
      ]
    },
    {
      "name": "video_width",
      "arrow_type": "int32",
      "nullable": false
    },
    {
      "name": "video_height",
      "arrow_type": "int32",
      "nullable": false
    },
    {
      "name": "member_name",
      "arrow_type": "string",
      "nullable": false,
      "description": "Full tar member name, for example {sample_key}.mp4."
    },
    {
      "name": "member_suffix",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "mp4",
        "actions.bin",
        "state.bin",
        "events.json",
        "json"
      ]
    },
    {
      "name": "modality",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "video",
        "actions",
        "state",
        "events",
        "metadata"
      ]
    },
    {
      "name": "content_type",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "video/mp4",
        "application/octet-stream",
        "application/json"
      ]
    },
    {
      "name": "shard_path",
      "arrow_type": "string",
      "nullable": false,
      "description": "Relative path to the public shard inside the release repo."
    },
    {
      "name": "shard_id",
      "arrow_type": "int32",
      "nullable": false
    },
    {
      "name": "member_index",
      "arrow_type": "int32",
      "nullable": false,
      "description": "Zero-indexed member order within the tar shard."
    },
    {
      "name": "member_offset",
      "arrow_type": "int64",
      "nullable": false,
      "description": "Byte offset of the member payload inside the uncompressed tar."
    },
    {
      "name": "member_length",
      "arrow_type": "int64",
      "nullable": false,
      "description": "Payload length in bytes."
    },
    {
      "name": "member_sha256",
      "arrow_type": "string",
      "nullable": false,
      "description": "Hex SHA-256 of the member payload."
    },
    {
      "name": "shard_size_bytes",
      "arrow_type": "int64",
      "nullable": false
    },
    {
      "name": "shard_sha256",
      "arrow_type": "string",
      "nullable": false,
      "description": "Hex SHA-256 of the full tar shard."
    },
    {
      "name": "tar_format",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "ustar"
      ]
    },
    {
      "name": "compression",
      "arrow_type": "string",
      "nullable": false,
      "valid_values": [
        "none"
      ],
      "description": "Shard tar compression. Current release shards are uncompressed."
    }
  ],
  "validation": [
    "primary key is unique",
    "member_offset >= 0",
    "member_length > 0",
    "member_sha256 is a 64-character lowercase hex SHA-256",
    "shard_sha256 is a 64-character lowercase hex SHA-256",
    "HTTP range bytes=member_offset-(member_offset+member_length-1) returns exactly the member payload",
    "each sample_key has exactly five member_suffix values per resolution",
    "no column is named clip_id"
  ]
}