feat: add ducklake_fdw for read-only access to DuckLake tables#59
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feat: add ducklake_fdw for read-only access to DuckLake tables#59
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Add a PostgreSQL Foreign Data Wrapper that provides read-only access to DuckLake tables, supporting both regular PostgreSQL-backed metadata catalogs and frozen HTTP-hosted .ducklake snapshots. Key design decisions: - Queries route through DuckDB via pg_duckdb's external-table-check hook rather than FDW scan callbacks, preserving DuckDB's vectorized execution for full query plans. - Column inference at CREATE FOREIGN TABLE time probes the remote schema via a temporary DuckDB connection, so users never specify column definitions manually. - DML is blocked at plan time with clear error messages. - Reuses pg_duckdb's GetPostgresDuckDBType/Typemod for type mapping (exported with default visibility in the submodule update). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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The previous commit referenced the old submodule pointer. This updates it to include the hooks and visibility exports needed by ducklake_fdw. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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The function signature differs across PG versions: - PG 14-16: 10 args (no fdw_restrictinfo) - PG 17: 11 args (added fdw_restrictinfo) - PG 18: 12 args (added disabled_nodes) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Remove unrelated .dockerignore changes (belong to duckdb-postgres PR) - Eliminate namespace forwarding wrapper for RegisterForeignTablesInQuery - Restore original header comment in pgducklake_duckdb.hpp - Fix #pragma once placement in pgducklake_fdw.hpp Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Add
ducklake_fdw, a read-only Foreign Data Wrapper for DuckLake tables. Supports both PostgreSQL-backed metadata catalogs and frozen HTTP-hosted.ducklakesnapshots.Queries route through DuckDB via pg_duckdb's external-table-check hook, preserving vectorized execution. Column definitions are auto-inferred at
CREATE FOREIGN TABLEtime.Test plan
fdwandfrozen_fdw)