YuweiXIAO

[HUDI-4373] Flink Consistent hashing bucket index write path code

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### Change Logs Implement consistent hashing bucket index for flink. This PR only covers the write core of the index, and the resizing implementation will be in another PR. There...

[HUDI-4895] Object store based lock provider

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### Change Logs Currently, we have `FileSystemBasedLockProvier`, which relies on the atomic guarantee of the underlying file system. Specifically, only with filesystem's atomic rename & atomic create capability, the LockProvider...

stack alignment of matrial bindata causes segmentfault

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* code polyscope::init(); polyscope::show(); * output [polyscope] Backend: openGL3_glfw -- Loaded openGL version: 4.1 ATI-3.5.5 [1] 5910 segmentation fault ./demo * call stack exception: stack_not_16_byte_aligned_error stb_image.h: stbi__load_and_postprocess_8bit stb_image.h: stbi__loadf_main stb_image.h:...

Support `insert_into_select` for Postgres table

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Partially fixes #30

Support parallel DuckDB threads for Postgres table scan

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Currently, we use a single DuckDB thread for Postgres table scan, even though multiple Postgres workers will be initialized. This leads to a performance bottleneck when scanning large amounts of...

UDF for loading an existing Lakehouse table (e.g., Iceberg) into a DuckDB lake

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This is a feature request:) Keep the data as it is in S3 and load the metadata into DuckLake. It could be a read-only DuckLake table, or DuckLake could own...

DuckDB’s VARCHAR type is mapped to PostgreSQL TEXT, but its VARCHAR[] arrays were previously mapped to PostgreSQL VARCHAR[]. This inconsistency causes a type mismatch on the Postgres side during statistics...

External Tables: Persistent Postgres table for managing external data queried by DuckDB readers

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This PR introduces external table support, allowing users to persist an external file's view queried through DuckDB's readers (`read_csv`, `read_parquet`, and `read_json`). Previously, users had to embed file locations and...

Failed to spill to temp directory when running large SQL using normal user

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### What happens? The error: ``` ERROR: (PGDuckDB/Duckdb_ExecCustomScan_Cpp) Permission Error: File system LocalFileSystem has been disabled by configuration ``` I gdb the backend and find it is accessing `/pg_data/data/pg_duckdb/temp` Though...

ducklake integration

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This PR is a proof of concept for integrating [`ducklake`](https://github.com/duckdb/ducklake) into `pg_duckdb`, named `pg_ducklake`. A new table AM called `ducklake` is introduced and supports create/insert/query ducklake tables directly through Postgres....