dimgigov
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59 lines
998 B
Markdown
59 lines
998 B
Markdown
# Kolumnare Speicherung
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Spaltenorientierte Speicherung für analytische Abfragen und Aggregation.
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## Verwendung
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```nim
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import barabadb/core/columnar
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var batch = newColumnBatch()
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var ageCol = batch.addInt64Col("age")
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var nameCol = batch.addStringCol("name")
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ageCol.appendInt64(25)
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nameCol.appendString("Alice")
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```
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## Aggregation
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```nim
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echo ageCol.sumInt64()
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echo ageCol.avgInt64()
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echo ageCol.minInt64()
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echo ageCol.maxInt64()
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echo ageCol.count()
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```
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## Kodierung
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### RLE (Run-Length Encoding)
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```nim
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let rle = rleEncode(@[1'i64, 1, 1, 2, 2, 3])
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```
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### Dictionary-Kodierung
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```nim
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let dict = dictEncode(@["apple", "banana", "apple"])
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```
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## Spaltentypen
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| Typ | Beschreibung |
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|------|-------------|
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| `int32` | 32-Bit Integer |
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| `int64` | 64-Bit Integer |
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| `float32` | 32-Bit Float |
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| `float64` | 64-Bit Float |
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| `string` | Variable-length String |
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| `bool` | Boolean |
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## Anwendungsfälle
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- OLAP-Workloads
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- Großflächige Aggregation
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- Data Warehousing
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- Zeitreihenanalyse
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