LanceDB Table

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/lancedb/main/json-schema/lancedb-table-schema.json",
  "title": "LanceDB Table",
  "description": "A Lance table inside a LanceDB namespace. Tables are columnar (Lance format), versioned, and may carry vector, full-text, and scalar indexes.",
  "type": "object",
  "required": ["name", "namespace", "schema"],
  "properties": {
    "name": {
      "type": "string",
      "description": "Table identifier within its namespace.",
      "pattern": "^[A-Za-z_][A-Za-z0-9_]*$"
    },
    "namespace": {
      "type": "array",
      "description": "Hierarchical namespace path (e.g. ['warehouse', 'project']).",
      "items": { "type": "string" }
    },
    "location": {
      "type": "string",
      "format": "uri",
      "description": "Object-store URI where the table is materialized (s3://, gs://, az://, file://)."
    },
    "schema": {
      "type": "object",
      "description": "Arrow schema for the table.",
      "required": ["fields"],
      "properties": {
        "fields": {
          "type": "array",
          "items": { "$ref": "#/$defs/Field" }
        },
        "metadata": {
          "type": "object",
          "additionalProperties": { "type": "string" }
        }
      }
    },
    "version": {
      "type": "integer",
      "minimum": 0,
      "description": "Monotonic version number of the table state."
    },
    "properties": {
      "type": "object",
      "description": "Free-form key/value table properties (e.g. retention, owner, description).",
      "additionalProperties": { "type": "string" }
    },
    "indexes": {
      "type": "array",
      "description": "Indexes attached to this table.",
      "items": { "$ref": "#/$defs/Index" }
    },
    "tags": {
      "type": "array",
      "description": "Named tags pointing at specific versions of the table.",
      "items": { "$ref": "#/$defs/Tag" }
    },
    "stats": {
      "type": "object",
      "properties": {
        "numRows": { "type": "integer", "minimum": 0 },
        "numFragments": { "type": "integer", "minimum": 0 },
        "sizeBytes": { "type": "integer", "minimum": 0 }
      }
    }
  },
  "$defs": {
    "Field": {
      "type": "object",
      "required": ["name", "type"],
      "properties": {
        "name": { "type": "string" },
        "type": {
          "description": "Arrow logical type identifier (e.g. utf8, int64, float32, fixed_size_list).",
          "type": "string"
        },
        "nullable": { "type": "boolean", "default": true },
        "metadata": {
          "type": "object",
          "additionalProperties": { "type": "string" }
        },
        "vectorDimension": {
          "type": "integer",
          "minimum": 1,
          "description": "When the field is a fixed-size embedding vector, its dimensionality."
        }
      }
    },
    "Index": {
      "type": "object",
      "required": ["name", "column", "indexType"],
      "properties": {
        "name": { "type": "string" },
        "column": { "type": "string" },
        "indexType": {
          "type": "string",
          "enum": [
            "BTREE", "BITMAP", "LABEL_LIST", "FTS",
            "IVF_FLAT", "IVF_PQ", "IVF_HNSW_SQ", "IVF_HNSW_PQ"
          ]
        },
        "metric": {
          "type": "string",
          "enum": ["l2", "cosine", "dot"],
          "description": "Distance metric for vector indexes."
        },
        "numPartitions": { "type": "integer", "minimum": 1 },
        "numSubVectors": { "type": "integer", "minimum": 1 },
        "status": {
          "type": "string",
          "enum": ["PENDING", "BUILDING", "READY", "FAILED"]
        }
      }
    },
    "Tag": {
      "type": "object",
      "required": ["name", "version"],
      "properties": {
        "name": { "type": "string" },
        "version": { "type": "integer", "minimum": 0 }
      }
    }
  }
}