DuckDB Public Repo System Review Graph

Bigger Picture

This example shows how to map a database engine repo. The system is not just a command-line tool or a client library; it is a layered execution engine where SQL is parsed, bound, planned, optimized, executed in vectorized operators, connected to storage and transactions, and extended through extensions. A reviewer should understand the route from query text to result chunks and persisted state.

Source Links

• GitHub repository - Primary public source used for repo identity and source paths.
• DuckDB documentation - Public docs for SQL, clients, extensions, and engine behavior.
• DuckDB internals overview - Public internals documentation for engine orientation.

Report Registers

Coverage Register

Evidence Register

Gap Register

Action Register

Lifecycle Map

flowchart LR
  receive_sql["Receive SQL"]
  parse_and_bind["Parse And Bind"]
  plan_and_optimize["Plan And Optimize"]
  execute_plan["Execute Plan"]
  commit_or_return["Commit Or Return Results"]
  load_extension["Load Extension"]
  receive_sql --> parse_and_bind["Parse And Bind"]
  parse_and_bind --> plan_and_optimize["Plan And Optimize"]
  plan_and_optimize --> execute_plan["Execute Plan"]
  execute_plan --> commit_or_return["Commit Or Return Results"]
  load_extension --> parse_and_bind["Parse And Bind"]

Artifact And Schema Map

flowchart LR
  system_sql_front_door["SQL Front Door"]
  system_sql_front_door --> artifact_parser_source["Parser Source"]
  artifact_parser_source --> schema_SQLRequest["SQLRequest"]
  system_planner_optimizer["Planner And Optimizer"]
  system_planner_optimizer --> artifact_planner_source["Planner Source"]
  artifact_planner_source --> schema_LogicalPlan["LogicalPlan"]
  system_planner_optimizer --> artifact_optimizer_source["Optimizer Source"]
  artifact_optimizer_source --> schema_LogicalPlan["LogicalPlan"]
  system_vectorized_execution_engine["Vectorized Execution Engine"]
  system_vectorized_execution_engine --> artifact_execution_source["Execution Source"]
  artifact_execution_source --> schema_PhysicalPlan["PhysicalPlan"]
  system_storage_transaction_layer["Storage And Transaction Layer"]
  system_storage_transaction_layer --> artifact_storage_source["Storage Source"]
  artifact_storage_source --> schema_StorageTransaction["StorageTransaction"]
  system_storage_transaction_layer --> artifact_transaction_source["Transaction Source"]
  artifact_transaction_source --> schema_StorageTransaction["StorageTransaction"]
  system_extension_system["Extension System"]
  system_extension_system --> artifact_extension_tree["Extension Tree"]
  artifact_extension_tree --> schema_ExtensionSpec["ExtensionSpec"]
  system_quality_compatibility_loop["Quality And Compatibility Loop"]
  system_quality_compatibility_loop --> artifact_test_suite["Test Suite"]
  artifact_test_suite --> schema_SQLRequest["SQLRequest"]

Gate Map

flowchart LR
  gate_parse_bind_gate{"Parse And Bind Gate"}
  gate_parse_bind_gate --> out_parse_bind_gate_LogicalPlan["LogicalPlan"]
  gate_parse_bind_gate --> out_parse_bind_gate_query_error["query_error"]
  gate_optimization_gate{"Optimization Gate"}
  gate_optimization_gate --> out_optimization_gate_optimized_plan["optimized_plan"]
  gate_optimization_gate --> out_optimization_gate_fallback_plan["fallback_plan"]
  gate_execution_gate{"Execution Gate"}
  gate_execution_gate --> out_execution_gate_DataChunk["DataChunk"]
  gate_execution_gate --> out_execution_gate_execution_error["execution_error"]
  gate_storage_commit_gate{"Storage Commit Gate"}
  gate_storage_commit_gate --> out_storage_commit_gate_committed["committed"]
  gate_storage_commit_gate --> out_storage_commit_gate_rolled_back["rolled_back"]
  gate_extension_load_gate{"Extension Load Gate"}
  gate_extension_load_gate --> out_extension_load_gate_extension_loaded["extension_loaded"]
  gate_extension_load_gate --> out_extension_load_gate_extension_blocked["extension_blocked"]
  gate_parse_bind_gate{"Parse And Bind Gate"} --> step_parse_and_bind["Parse And Bind"]
  gate_optimization_gate{"Optimization Gate"} --> step_plan_and_optimize["Plan And Optimize"]
  gate_execution_gate{"Execution Gate"} --> step_execute_plan["Execute Plan"]
  gate_storage_commit_gate{"Storage Commit Gate"} --> step_commit_or_return["Commit Or Return Results"]
  gate_extension_load_gate{"Extension Load Gate"} --> step_load_extension["Load Extension"]

Relationship Graph

flowchart TD
  extension_system["Extension System"] -- "adds functions to" --> planner_optimizer["Planner And Optimizer"]
  storage_transaction_layer["Storage And Transaction Layer"] -- "feeds data to" --> vectorized_execution_engine["Vectorized Execution Engine"]
  sql_front_door["SQL Front Door"] -- "owns or uses" --> parser_source["Parser Source"]
  sql_front_door["SQL Front Door"] -- "is gated by" --> parse_bind_gate["Parse And Bind Gate"]
  planner_optimizer["Planner And Optimizer"] -- "owns or uses" --> planner_source["Planner Source"]
  planner_optimizer["Planner And Optimizer"] -- "owns or uses" --> optimizer_source["Optimizer Source"]
  planner_optimizer["Planner And Optimizer"] -- "is gated by" --> optimization_gate["Optimization Gate"]
  vectorized_execution_engine["Vectorized Execution Engine"] -- "owns or uses" --> execution_source["Execution Source"]
  vectorized_execution_engine["Vectorized Execution Engine"] -- "is gated by" --> execution_gate["Execution Gate"]
  storage_transaction_layer["Storage And Transaction Layer"] -- "owns or uses" --> storage_source["Storage Source"]
  storage_transaction_layer["Storage And Transaction Layer"] -- "owns or uses" --> transaction_source["Transaction Source"]
  storage_transaction_layer["Storage And Transaction Layer"] -- "is gated by" --> storage_commit_gate["Storage Commit Gate"]
  storage_transaction_layer["Storage And Transaction Layer"] -- "is gated by" --> execution_gate["Execution Gate"]
  extension_system["Extension System"] -- "owns or uses" --> extension_tree["Extension Tree"]
  extension_system["Extension System"] -- "is gated by" --> extension_load_gate["Extension Load Gate"]
  quality_compatibility_loop["Quality And Compatibility Loop"] -- "owns or uses" --> test_suite["Test Suite"]
  quality_compatibility_loop["Quality And Compatibility Loop"] -- "is gated by" --> parse_bind_gate["Parse And Bind Gate"]
  quality_compatibility_loop["Quality And Compatibility Loop"] -- "is gated by" --> execution_gate["Execution Gate"]
  quality_compatibility_loop["Quality And Compatibility Loop"] -- "is gated by" --> storage_commit_gate["Storage Commit Gate"]
  client_request["client_request"] -- "feeds" --> receive_sql["Receive SQL"]
  receive_sql["Receive SQL"] -- "produces" --> SQLRequest["SQLRequest"]
  receive_sql["Receive SQL"] -- "routes to" --> parse_and_bind["Parse And Bind"]
  SQLRequest["SQLRequest"] -- "feeds" --> parse_and_bind["Parse And Bind"]
  parser_source["Parser Source"] -- "feeds" --> parse_and_bind["Parse And Bind"]
  parse_and_bind["Parse And Bind"] -- "produces" --> LogicalPlan["LogicalPlan"]
  parse_bind_gate["Parse And Bind Gate"] -- "gates" --> parse_and_bind["Parse And Bind"]
  parse_and_bind["Parse And Bind"] -- "routes to" --> plan_and_optimize["Plan And Optimize"]
  LogicalPlan["LogicalPlan"] -- "feeds" --> plan_and_optimize["Plan And Optimize"]
  planner_source["Planner Source"] -- "feeds" --> plan_and_optimize["Plan And Optimize"]
  optimizer_source["Optimizer Source"] -- "feeds" --> plan_and_optimize["Plan And Optimize"]
  plan_and_optimize["Plan And Optimize"] -- "produces" --> PhysicalPlan["PhysicalPlan"]
  optimization_gate["Optimization Gate"] -- "gates" --> plan_and_optimize["Plan And Optimize"]
  plan_and_optimize["Plan And Optimize"] -- "routes to" --> execute_plan["Execute Plan"]
  PhysicalPlan["PhysicalPlan"] -- "feeds" --> execute_plan["Execute Plan"]
  execution_source["Execution Source"] -- "feeds" --> execute_plan["Execute Plan"]
  StorageTransaction["StorageTransaction"] -- "feeds" --> execute_plan["Execute Plan"]
  execute_plan["Execute Plan"] -- "produces" --> DataChunk["DataChunk"]
  execution_gate["Execution Gate"] -- "gates" --> execute_plan["Execute Plan"]
  execute_plan["Execute Plan"] -- "routes to" --> commit_or_return["Commit Or Return Results"]
  DataChunk["DataChunk"] -- "feeds" --> commit_or_return["Commit Or Return Results"]
  StorageTransaction["StorageTransaction"] -- "feeds" --> commit_or_return["Commit Or Return Results"]
  commit_or_return["Commit Or Return Results"] -- "produces" --> query_result["query_result"]
  commit_or_return["Commit Or Return Results"] -- "produces" --> committed["committed"]
  storage_commit_gate["Storage Commit Gate"] -- "gates" --> commit_or_return["Commit Or Return Results"]
  ExtensionSpec["ExtensionSpec"] -- "feeds" --> load_extension["Load Extension"]
  extension_tree["Extension Tree"] -- "feeds" --> load_extension["Load Extension"]
  load_extension["Load Extension"] -- "produces" --> extension_loaded["extension_loaded"]
  extension_load_gate["Extension Load Gate"] -- "gates" --> load_extension["Load Extension"]
  load_extension["Load Extension"] -- "routes to" --> parse_and_bind["Parse And Bind"]

Systems

Review Questions

• How does SQL move from text to parsed statement, logical plan, optimized plan, physical operators, and result chunks?
• Which gates preserve query semantics during binding and optimization?
• Where do storage and transaction boundaries constrain execution?
• How do extensions expand engine behavior without destabilizing the core?
• Which public tests, fuzzers, benchmarks, and release notes would a deeper audit inspect?