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[docs] Add BloomFilter supported data types with hash function details #8313

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JingsongLi merged 1 commit into from
Jun 22, 2026
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[docs] Add BloomFilter supported data types with hash function details #8313

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13 changes: 11 additions & 2 deletions docs/docs/concepts/spec/fileindex.mdx
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Expand Up @@ -98,8 +98,17 @@ Content of bloom filter index is simple:
This class use (64-bits) long hash. Store the num hash function (one integer) and bit set bytes only. Hash bytes type
(like varchar, binary, etc.) using xx hash, hash numeric type by [specified number hash](http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm).

BloomFilter only support the following data type: TinyIntType, SmallIntType, IntType, BigIntType, FloatType, DoubleType,
DateType, TimeType, TimestampType, LocalZonedTimestampType, CharType, VarCharType, BinaryType, VarBinaryType.
BloomFilter supports the following data types:

| Data type | Hash function |
|-----------|--------------|
| `CharType`, `VarCharType` | xx hash (64-bit) |
| `BinaryType`, `VarBinaryType` | xx hash (64-bit) |
| `TinyIntType`, `SmallIntType`, `IntType`, `BigIntType` | Thomas Wang hash |
| `FloatType`, `DoubleType` | Thomas Wang hash (on IEEE 754 bit representation) |
| `DateType`, `TimeType`, `TimestampType`, `LocalZonedTimestampType` | Thomas Wang hash |

BloomFilter does not support: `BooleanType`, `DecimalType`, `VariantType`, `BlobType`, `ArrayType`, `VectorType`, `MultisetType`, `MapType`, `RowType`.

## Index: Bitmap

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