Parquet Viewer — DBConvert

Opens .parquet files from chat links as tables, so you can check what an agent wrote without leaving the thread. Agents in the thread can list the columns of the open file and run read-only queries on it, so their answers come from the file. Shows the schema, row groups, codec and per-column statistics from the file's footer, and joins several Parquet files in one query. DuckDB runs as WebAssembly in the panel, and the file is never uploaded. Exporting more than 10,000 rows of a result needs DBConvert PRO ($9 a month).

Overview

View source

What you get

File details from the footer, before a row is read: row groups, codec, size on disk against uncompressed size, and the writer.
Column statistics: type, minimum, maximum, null count and bytes in the file.
Data grid, paged to the last row.
SQL tab for read-only SELECT and WITH queries in DuckDB's SQL.
Several files at once: add more .parquet files with Choose files, and each becomes a named view you can join.

If another plugin opens these files instead, choose this viewer under Settings → File openers in bb.

Agents

In a Claude Code or Codex thread, the agent gets three tools: parquet_list_tables, parquet_describe_table and parquet_run_select. They work on the file open in the viewer, read-only, and return at most 100 rows a query.

Ask AI puts a question about the open file into the thread's message box, for you to send.

Where the file goes

Nowhere. bb streams the file from the machine that holds it into the panel, where DuckDB compiled to WebAssembly reads it.

The plugin calls one outside service. With a DBConvert API key set, it asks the DBConvert licensing service which PRO features the account has.

Free and PRO

Viewing, SQL and exporting up to 10,000 rows as CSV, JSON or Parquet are free. DBConvert PRO ($9 a month) adds exporting a whole result.

To unlock PRO, enter the API key from https://streams.dbconvert.com/account in the plugin's settings.

Also available

The same viewer runs in VS Code, in Chrome and on the web: https://streams.dbconvert.com/parquet-viewer

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