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Add logical types section to README #37

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Merged
unexge merged 1 commit into from
Feb 5, 2026
Merged

Add logical types section to README #37

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15 changes: 15 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -92,3 +92,18 @@ switch (dynamic) {
const list = try rg.readListColumn(i32, 0);
const map = try rg.readMapColumn([]const u8, i64, 0, 1);
```

**Logical types** - choose how to interpret physical values:
```zig
const logical = parzig.parquet.logical;

const dates = try rg.readColumn(logical.Date, 0);
const timestamps = try rg.readColumn(logical.TimestampMicros, 1);
const decimals = try rg.readColumn(logical.Decimal, 2);
const uuids = try rg.readColumn(logical.UUID, 3);
```

Supported logical types:
- **Temporal**: `Date`, `TimeMillis`, `TimeMicros`, `TimeNanos`, `TimestampMillis`, `TimestampMicros`, `TimestampNanos`
- **Numeric**: `Int8`, `UInt8`, `Int16`, `UInt16`, `UInt32`, `UInt64`, `Float16`, `Decimal`
- **Other**: `UUID`, `String`, `Enum`, `Json`, `Bson`