inspect_table
Retrieve comprehensive metadata for Trino database tables, including column definitions and statistics, to analyze data structure and optimize queries.
Instructions
Get detailed metadata about a table.
Args:
catalog: Catalog name.
schema: Schema name.
table: Table name.
Returns:
Dict[str, Any]: Table metadata including columns, statistics, etc.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| catalog | Yes | ||
| schema | Yes | ||
| table | Yes |
Implementation Reference
- src/trino_mcp/tools/__init__.py:113-184 (handler)The inspect_table tool handler: decorated with @mcp.tool(), fetches table metadata via TrinoClient.get_table_details, computes row count with a COUNT(*) query, enhances columns with data types, nullability, and defaults from information_schema.columns.
@mcp.tool() def inspect_table( catalog: str, schema: str, table: str ) -> Dict[str, Any]: """ Get detailed metadata about a table. Args: catalog: Catalog name. schema: Schema name. table: Table name. Returns: Dict[str, Any]: Table metadata including columns, statistics, etc. """ logger.info(f"Inspecting table: {catalog}.{schema}.{table}") try: table_details = client.get_table_details(catalog, schema, table) # Try to get a row count (this might not work on all connectors) try: count_result = client.execute_query( f"SELECT count(*) AS row_count FROM {catalog}.{schema}.{table}" ) if count_result.rows and count_result.rows[0]: table_details["row_count"] = count_result.rows[0][0] except Exception as e: logger.warning(f"Failed to get row count: {e}") # Get additional info from the information_schema if available try: info_schema_query = f""" SELECT column_name, data_type, is_nullable, column_default FROM {catalog}.information_schema.columns WHERE table_catalog = '{catalog}' AND table_schema = '{schema}' AND table_name = '{table}' """ info_schema_result = client.execute_query(info_schema_query) enhanced_columns = [] for col in table_details["columns"]: enhanced_col = col.copy() # Find matching info_schema row for row in info_schema_result.rows: if row[0] == col["name"]: enhanced_col["data_type"] = row[1] enhanced_col["is_nullable"] = row[2] enhanced_col["default"] = row[3] break enhanced_columns.append(enhanced_col) table_details["columns"] = enhanced_columns except Exception as e: logger.warning(f"Failed to get column details from information_schema: {e}") return table_details except Exception as e: error_msg = str(e) logger.error(f"Table inspection failed: {error_msg}") return { "error": error_msg, "catalog": catalog, "schema": schema, "table": table } - src/trino_mcp/tools/__init__.py:13-22 (registration)The register_trino_tools function where inspect_table is registered via @mcp.tool() decorator among other Trino tools.
def register_trino_tools(mcp: FastMCP, client: TrinoClient) -> None: """ Register Trino tools with the MCP server. Args: mcp: The MCP server instance. client: The Trino client instance. """ @mcp.tool()