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pqcat

Fast command-line tool for inspecting Parquet files.

Installation

pip install pqcat

Usage

$ pqcat
Usage: pqcat [OPTIONS] COMMAND [ARGS]...

 Fast CLI tool for Parquet using Polars


╭─ Options ──────────────────────────────────────────────────────────────────────────────────────────────╮
│ --install-completion          Install completion for the current shell.                                │
│ --show-completion             Show completion for the current shell, to copy it or customize the       │
│                               installation.                                                            │
│ --help                        Show this message and exit.                                              │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────╯
╭─ Commands ─────────────────────────────────────────────────────────────────────────────────────────────╮
│ head        Show first N rows                                                                          │
│ tail        Show last N rows                                                                           │
│ cat         Show all rows (alias for show)                                                             │
│ schema      Show schema of Parquet file                                                                │
│ row-count   Show number of rows                                                                        │
│ stats       Show Parquet stats                                                                         │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────╯
Usage: pqcat [OPTIONS] COMMAND [ARGS]...

cat command

$ pqcat cat examples/retail.parquet
shape: (50, 8)
┌─────────┬────────────┬────────────┬───────────┬───────────┬──────────┬────────┬─────────────┐
│ OrderID  CustomerID  OrderDate   ProductID  Category   Quantity  Price   TotalAmount │
│ ---      ---         ---         ---        ---        ---       ---     ---         │
│ str      str         str         str        str        i64       f64     f64         │
╞═════════╪════════════╪════════════╪═══════════╪═══════════╪══════════╪════════╪═════════════╡
│ O0001    C1007       2024-01-27  P016       Clothing   1         159.57  159.57      │
│ O0002    C1001       2024-01-01  P011       Toys       3         10.54   31.62       │
│ O0003    C1011       2024-01-23  P011       Clothing   1         82.04   82.04       │
│ O0004    C1020       2024-01-18  P006       Toys       5         174.84  874.2       │
│ O0005    C1017       2024-01-26  P001       Clothing   1         16.62   16.62       │
│                                                                              │
│ O0046    C1010       2024-01-25  P007       Toys       4         93.06   372.24      │
│ O0047    C1017       2024-01-13  P009       Books      5         14.31   71.55       │
│ O0048    C1013       2024-01-28  P015       Books      5         106.63  533.15      │
│ O0049    C1005       2024-01-27  P011       Toys       1         105.6   105.6       │
│ O0050    C1000       2024-01-06  P019       Groceries  2         47.31   94.62       │
└─────────┴────────────┴────────────┴───────────┴───────────┴──────────┴────────┴─────────────┘

head command

$ pqcat head examples/retail.parquet -n 5 --columns Category,Price --format csv --filter "Price>100"
Category,Price
Clothing,159.57
Toys,174.84
Groceries,133.34
Clothing,152.98
Toys,119.59

schema command

$ pqcat schema examples/retail.parquet
OrderID: String
CustomerID: String
OrderDate: String
ProductID: String
Category: String
Quantity: Int64
Price: Float64
TotalAmount: Float64

row-count command

$ pqcat row-count examples/retail.parquet
50

stats command

$ pqcat stats examples/retail.parquet
┌────────────┬─────────┬────────────┬────────────┬───┬──────────┬──────────┬───────────┬─────────────┐
│ statistic   OrderID  CustomerID  OrderDate     Category  Quantity  Price      TotalAmount │
│ ---         ---      ---         ---            ---       ---       ---        ---         │
│ str         str      str         str            str       f64       f64        f64         │
╞════════════╪═════════╪════════════╪════════════╪═══╪══════════╪══════════╪═══════════╪═════════════╡
│ count       50       50          50            50        50.0      50.0       50.0        │
│ null_count  0        0           0             0         0.0       0.0        0.0         │
│ mean        null     null        null          null      2.74      88.6722    231.8516    │
│ std         null     null        null          null      1.454199  59.740505  201.475002  │
│ min         O0001    C1000       2024-01-01    Books     1.0       10.54      11.73       │
│ 25%         null     null        null          null      1.0       24.91      76.8        │
│ 50%         null     null        null          null      3.0       93.06      159.57      │
│ 75%         null     null        null          null      4.0       147.87     372.24      │
│ max         O0050    C1020       2024-01-30    Toys      5.0       197.7      874.2       │
└────────────┴─────────┴────────────┴────────────┴───┴──────────┴──────────┴───────────┴─────────────┘

References

This project is inspired by https://github.com/hangxie/parquet-tools.

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