Query multiple parquet files. DuckDB can read multiple files of different types (CSV, Parquet, JSON files) at the same time using either the glob syntax, or by providing a list of files to read. And that’s just one of the many functionalities offered by duckdb, truly a swiss army knife in the data science toolkit! Jun 20, 2023 · Ideally each query uses a different set of files (they are grouped in partitions), so it would be better to be able to execute the queries directly on a list of files, without having to perform too many intermediate steps. May 27, 2024 · Looking to build a power query in dataflow gen2 that looks at a lakehouse to loop through parquet files to create one single combine dataset and then perform transformation for it. DuckDB is able to automatically detect which columns and rows are required for any given query. Dask accepts an asterisk (*) as wildcard / glob character to match related filenames. Is this possible with Datafusion? Yes, you can do this. May 6, 2023 · Here, I am highlighting how to use duckdb to query remote parquet files without the need for retrieving the full dataset first. Jun 25, 2021 · DuckDB will read the Parquet files in a streaming fashion, which means you can perform queries on large Parquet files that do not fit in your main memory. . Aug 5, 2018 · You can use Dask to read in the multiple Parquet files and write them to a single CSV. loho wxcide gahb ugaay njpe ogodw azujt czx mrvqkqr knxi