Inspect Parquet row groups before scanning the data.
See how a Parquet file is physically laid out. Parquet Inspector shows row-group sizes, compression ratios, column chunks, codecs, encodings and available min/max/null statistics directly in your browser.
Open Parquet InspectorWhat a row group tells you
Spot very small or uneven groups that may increase scan overhead.
Compare compressed and uncompressed bytes for each row group.
Inspect codec, encoding and byte footprint for each column.
Review min, max and null counts when the writer stored them.
Why inspect row groups?
Diagnose poor pruning
Query engines can use row-group statistics to skip groups that cannot match a filter. Missing or weak statistics can reduce pruning efficiency.
Compare compression behavior
Compression is recorded at the column-chunk level, so codecs and compression ratios can differ across columns and groups.
Check file layout before benchmarking
Two files can behave very differently when their row-group sizes, encodings or writers differ. Footer metadata gives useful context before performance testing.
What Parquet Inspector exposes
The Row Groups view shows row count, compressed size, uncompressed size, compression ratio and column-chunk count for each group. The Column Chunks view adds column path, codec, encodings, value count and available min, max and null statistics.
Parquet statistics are optional. If a writer did not store a statistic, the viewer cannot reconstruct it from metadata alone.
Local and private
The selected file is read locally in your browser. Parquet Inspector has no file-upload endpoint for this workflow.
Need to browse the records too? See the large Parquet file viewer guide.
Related searches
parquet row group viewer · inspect parquet row groups · parquet row group size · parquet compression ratio · parquet column chunk statistics · parquet min max statistics
Inspect a local Parquet file