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175 lines
5.5 KiB
C++
175 lines
5.5 KiB
C++
#include <Columns/ColumnString.h>
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#include <Columns/ColumnConst.h>
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#include <Common/typeid_cast.h>
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#include <Common/assert_cast.h>
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#include <Interpreters/SetVariants.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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template <typename Variant>
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void SetVariantsTemplate<Variant>::init(Type type_)
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{
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type = type_;
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switch (type)
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{
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case Type::EMPTY: break;
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#define M(NAME) \
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case Type::NAME: (NAME) = std::make_unique<typename decltype(NAME)::element_type>(); break;
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APPLY_FOR_SET_VARIANTS(M)
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#undef M
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}
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}
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template <typename Variant>
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size_t SetVariantsTemplate<Variant>::getTotalRowCount() const
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{
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switch (type)
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{
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case Type::EMPTY: return 0;
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#define M(NAME) \
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case Type::NAME: return (NAME)->data.size();
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APPLY_FOR_SET_VARIANTS(M)
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#undef M
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}
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__builtin_unreachable();
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}
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template <typename Variant>
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size_t SetVariantsTemplate<Variant>::getTotalByteCount() const
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{
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switch (type)
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{
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case Type::EMPTY: return 0;
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#define M(NAME) \
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case Type::NAME: return (NAME)->data.getBufferSizeInBytes();
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APPLY_FOR_SET_VARIANTS(M)
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#undef M
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}
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__builtin_unreachable();
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}
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template <typename Variant>
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typename SetVariantsTemplate<Variant>::Type SetVariantsTemplate<Variant>::chooseMethod(const ColumnRawPtrs & key_columns, Sizes & key_sizes)
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{
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/// Check if at least one of the specified keys is nullable.
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/// Create a set of nested key columns from the corresponding key columns.
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/// Here "nested" means that, if a key column is nullable, we take its nested
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/// column; otherwise we take the key column as is.
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ColumnRawPtrs nested_key_columns;
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nested_key_columns.reserve(key_columns.size());
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bool has_nullable_key = false;
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for (const auto & col : key_columns)
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{
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if (const auto * nullable = checkAndGetColumn<ColumnNullable>(*col))
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{
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nested_key_columns.push_back(&nullable->getNestedColumn());
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has_nullable_key = true;
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}
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else
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nested_key_columns.push_back(col);
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}
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size_t keys_size = nested_key_columns.size();
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bool all_fixed = true;
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size_t keys_bytes = 0;
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key_sizes.resize(keys_size);
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for (size_t j = 0; j < keys_size; ++j)
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{
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if (!nested_key_columns[j]->isFixedAndContiguous())
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{
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all_fixed = false;
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break;
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}
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key_sizes[j] = nested_key_columns[j]->sizeOfValueIfFixed();
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keys_bytes += key_sizes[j];
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}
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if (has_nullable_key)
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{
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/// At least one key is nullable. Therefore we choose a method
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/// that takes into account this fact.
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if ((keys_size == 1) && (nested_key_columns[0]->isNumeric()))
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{
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/// We have exactly one key and it is nullable. We shall add it a tag
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/// which specifies whether its value is null or not.
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size_t size_of_field = nested_key_columns[0]->sizeOfValueIfFixed();
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if ((size_of_field == 1) || (size_of_field == 2) || (size_of_field == 4) || (size_of_field == 8))
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return Type::nullable_keys128;
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/// Pass to more generic method
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}
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if (all_fixed)
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{
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/// Pack if possible all the keys along with information about which key values are nulls
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/// into a fixed 16- or 32-byte blob.
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if (keys_bytes > (std::numeric_limits<size_t>::max() - std::tuple_size<KeysNullMap<UInt128>>::value))
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throw Exception{"Aggregator: keys sizes overflow", ErrorCodes::LOGICAL_ERROR};
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if ((std::tuple_size<KeysNullMap<UInt128>>::value + keys_bytes) <= 16)
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return Type::nullable_keys128;
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if ((std::tuple_size<KeysNullMap<UInt256>>::value + keys_bytes) <= 32)
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return Type::nullable_keys256;
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}
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/// Fallback case.
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return Type::hashed;
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}
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/// If there is one numeric key that fits into 64 bits
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if (keys_size == 1 && nested_key_columns[0]->isNumeric() && !nested_key_columns[0]->lowCardinality())
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{
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size_t size_of_field = nested_key_columns[0]->sizeOfValueIfFixed();
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if (size_of_field == 1)
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return Type::key8;
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if (size_of_field == 2)
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return Type::key16;
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if (size_of_field == 4)
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return Type::key32;
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if (size_of_field == 8)
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return Type::key64;
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if (size_of_field == 16)
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return Type::keys128;
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if (size_of_field == 32)
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return Type::keys256;
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throw Exception("Logical error: numeric column has sizeOfField not in 1, 2, 4, 8, 16, 32.", ErrorCodes::LOGICAL_ERROR);
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}
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/// If the keys fit in N bits, we will use a hash table for N-bit-packed keys
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if (all_fixed && keys_bytes <= 16)
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return Type::keys128;
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if (all_fixed && keys_bytes <= 32)
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return Type::keys256;
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/// If there is single string key, use hash table of it's values.
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if (keys_size == 1
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&& (typeid_cast<const ColumnString *>(nested_key_columns[0])
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|| (isColumnConst(*nested_key_columns[0]) && typeid_cast<const ColumnString *>(&assert_cast<const ColumnConst *>(nested_key_columns[0])->getDataColumn()))))
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return Type::key_string;
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if (keys_size == 1 && typeid_cast<const ColumnFixedString *>(nested_key_columns[0]))
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return Type::key_fixed_string;
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/// Otherwise, will use set of cryptographic hashes of unambiguously serialized values.
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return Type::hashed;
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}
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template struct SetVariantsTemplate<NonClearableSet>;
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template struct SetVariantsTemplate<ClearableSet>;
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}
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