ClickHouse · al13n321 · Jan 29, 2025 · Nov 1, 2024 · Nov 1, 2024 · Nov 5, 2024
diff --git a/src/Processors/Formats/Impl/Parquet/ParquetBloomFilterCondition.cpp b/src/Processors/Formats/Impl/Parquet/ParquetBloomFilterCondition.cpp
diff --git a/src/Processors/Formats/Impl/Parquet/ParquetBloomFilterCondition.h b/src/Processors/Formats/Impl/Parquet/ParquetBloomFilterCondition.h
diff --git a/src/Processors/Formats/Impl/Parquet/parquetBloomFilterHash.cpp b/src/Processors/Formats/Impl/Parquet/parquetBloomFilterHash.cpp
@@ -0,0 +1,191 @@
+#include <Processors/Formats/Impl/Parquet/parquetBloomFilterHash.h>
+
+#if USE_PARQUET
+
+#include <parquet/metadata.h>
+#include <parquet/xxhasher.h>
+
+namespace DB
+{
+
+bool isParquetStringTypeSupportedForBloomFilters(
+    const std::shared_ptr<const parquet::LogicalType> & logical_type,
+    parquet::ConvertedType::type converted_type)
+{
+    if (logical_type &&
+        !logical_type->is_none()
+        && !(logical_type->is_string() || logical_type->is_BSON() || logical_type->is_JSON()))
+    {
+        return false;
+    }
+
+    if (parquet::ConvertedType::type::NONE != converted_type &&
+        !(converted_type == parquet::ConvertedType::JSON || converted_type == parquet::ConvertedType::UTF8
+          || converted_type == parquet::ConvertedType::BSON))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool isParquetIntegerTypeSupportedForBloomFilters(const std::shared_ptr<const parquet::LogicalType> & logical_type, parquet::ConvertedType::type converted_type)
+{
+    if (logical_type && !logical_type->is_none() && !logical_type->is_int())
+    {
+        return false;
+    }
+
+    if (parquet::ConvertedType::type::NONE != converted_type && !(converted_type == parquet::ConvertedType::INT_8 || converted_type == parquet::ConvertedType::INT_16
+                                                                  || converted_type == parquet::ConvertedType::INT_32 || converted_type == parquet::ConvertedType::INT_64
+                                                                  || converted_type == parquet::ConvertedType::UINT_8 || converted_type == parquet::ConvertedType::UINT_16
+                                                                  || converted_type == parquet::ConvertedType::UINT_32 || converted_type == parquet::ConvertedType::UINT_64))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+template <typename T>
+uint64_t hashSpecialFLBATypes(const Field & field)
+{
+    const T & value = field.safeGet<T>();
+
+    parquet::FLBA flba(reinterpret_cast<const uint8_t*>(&value));
+
+    parquet::XxHasher hasher;
+
+    return hasher.Hash(&flba, sizeof(T));
+};
+
+std::optional<uint64_t> tryHashStringWithoutCompatibilityCheck(const Field & field)
+{
+    const auto field_type = field.getType();
+
+    if (field_type != Field::Types::Which::String)
+    {
+        return std::nullopt;
+    }
+
+    parquet::XxHasher hasher;
+    parquet::ByteArray ba { field.safeGet<std::string>() };
+
+    return hasher.Hash(&ba);
+}
+
+std::optional<uint64_t> tryHashString(
+    const Field & field,
+    const std::shared_ptr<const parquet::LogicalType> & logical_type,
+    parquet::ConvertedType::type converted_type)
+{
+    if (!isParquetStringTypeSupportedForBloomFilters(logical_type, converted_type))
+    {
+        return std::nullopt;
+    }
+
+    return tryHashStringWithoutCompatibilityCheck(field);
+}
+
+std::optional<uint64_t> tryHashFLBA(
+    const Field & field,
+    const std::shared_ptr<const parquet::LogicalType> & logical_type,
+    parquet::ConvertedType::type converted_type,
+    std::size_t parquet_column_length)
+{
+    if (!isParquetStringTypeSupportedForBloomFilters(logical_type, converted_type))
+    {
+        return std::nullopt;
+    }
+
+    const auto field_type = field.getType();
+
+    if (field_type == Field::Types::Which::IPv6 && parquet_column_length == sizeof(IPv6))
+    {
+        return hashSpecialFLBATypes<IPv6>(field);
+    }
+
+    return tryHashStringWithoutCompatibilityCheck(field);
+}
+
+template <typename ParquetPhysicalType>
+std::optional<uint64_t> tryHashInt(const Field & field, const std::shared_ptr<const parquet::LogicalType> & logical_type, parquet::ConvertedType::type converted_type)
+{
+    if (!isParquetIntegerTypeSupportedForBloomFilters(logical_type, converted_type))
+    {
+        return std::nullopt;
+    }
+
+    parquet::XxHasher hasher;
+
+    if (field.getType() == Field::Types::Which::Int64)
+    {
+        return hasher.Hash(static_cast<ParquetPhysicalType>(field.safeGet<int64_t>()));
+    }
+    else if (field.getType() == Field::Types::Which::UInt64)
+    {
+        return hasher.Hash(static_cast<ParquetPhysicalType>(field.safeGet<uint64_t>()));
+    }
+    else if (field.getType() == Field::Types::IPv4)
+    {
+        /*
+         * In theory, we could accept IPv4 over 64 bits variables. It would only be a problem in case it was hashed using the byte array api
+         * with a zero-ed buffer that had a 32 bits variable copied into it.
+         *
+         * To be on the safe side, accept only in case physical type is 32 bits.
+         * */
+        if constexpr (std::is_same_v<int32_t, ParquetPhysicalType>)
+        {
+            return hasher.Hash(static_cast<ParquetPhysicalType>(field.safeGet<IPv4>()));
+        }
+    }
+
+    return std::nullopt;
+}
+
+std::optional<uint64_t> parquetTryHashField(const Field & field, const parquet::ColumnDescriptor * parquet_column_descriptor)
+{
+    const auto physical_type = parquet_column_descriptor->physical_type();
+    const auto & logical_type = parquet_column_descriptor->logical_type();
+    const auto converted_type = parquet_column_descriptor->converted_type();
+
+    switch (physical_type)
+    {
+        case parquet::Type::type::INT32:
+            return tryHashInt<int32_t>(field, logical_type, converted_type);
+        case parquet::Type::type::INT64:
+            return tryHashInt<int64_t>(field, logical_type, converted_type);
+        case parquet::Type::type::BYTE_ARRAY:
+            return tryHashString(field, logical_type, converted_type);
+        case parquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+            return tryHashFLBA(field, logical_type, converted_type, parquet_column_descriptor->type_length());
+        default:
+            return std::nullopt;
+    }
+}
+
+std::optional<std::vector<uint64_t>> parquetTryHashColumn(const IColumn * data_column, const parquet::ColumnDescriptor * parquet_column_descriptor)
+{
+    std::vector<uint64_t> hashes;
+
+    for (size_t i = 0u; i < data_column->size(); i++)
+    {
+        Field f;
+        data_column->get(i, f);
+
+        auto hashed_value = parquetTryHashField(f, parquet_column_descriptor);
+
+        if (!hashed_value)
+        {
+            return std::nullopt;
+        }
+
+        hashes.emplace_back(*hashed_value);
+    }
+
+    return hashes;
+}
+
+}
+
+#endif
diff --git a/src/Processors/Formats/Impl/Parquet/parquetBloomFilterHash.h b/src/Processors/Formats/Impl/Parquet/parquetBloomFilterHash.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include <config.h>
+
+#if USE_PARQUET
+
+#include <Processors/Formats/Impl/ArrowFieldIndexUtil.h>
+
+namespace DB
+{
+
+/*
+ * Try to hash a ClickHouse field, nullopt in case it can't be done
+ * */
+std::optional<uint64_t> parquetTryHashField(const Field & field, const parquet::ColumnDescriptor * parquet_column_descriptor);
+
+
+/*
+ * Try to hash elements in a ClickHouse column; Will return std::nullopt in case one of them can't be hashed
+ * */
+std::optional<std::vector<uint64_t>> parquetTryHashColumn(const IColumn * data_column, const parquet::ColumnDescriptor * parquet_column_descriptor);
+
+}
+
+#endif