ClickHouse/dbms/src/Storages/StorageJoin.cpp

#include <Storages/StorageJoin.h>
#include <Interpreters/Join.h>
#include <Interpreters/Limits.h>


namespace DB
{

namespace ErrorCodes
{
    extern const int NO_SUCH_COLUMN_IN_TABLE;
    extern const int INCOMPATIBLE_TYPE_OF_JOIN;
}


StorageJoin::StorageJoin(
    const String & path_,
    const String & name_,
    const Names & key_names_,
    ASTTableJoin::Kind kind_, ASTTableJoin::Strictness strictness_,
    const NamesAndTypes & columns_,
    const NamesAndTypes & materialized_columns_,
    const NamesAndTypes & alias_columns_,
    const ColumnDefaults & column_defaults_)
    : StorageSetOrJoinBase{path_, name_, columns_, materialized_columns_, alias_columns_, column_defaults_},
    key_names(key_names_), kind(kind_), strictness(strictness_)
{
    /// Check that key exists in table definition.
    const auto check_key_exists = [] (const NamesAndTypes & columns, const String & key)
    {
        for (const auto & column : columns)
            if (column.name == key)
                return true;
        return false;
    };

    for (const auto & key : key_names)
        if (!check_key_exists(columns, key) && !check_key_exists(materialized_columns, key))
            throw Exception{
                "Key column (" + key + ") does not exist in table declaration.",
                ErrorCodes::NO_SUCH_COLUMN_IN_TABLE};

    /// NOTE StorageJoin doesn't use join_use_nulls setting.

    join = std::make_shared<Join>(key_names, key_names, false /* use_nulls */, Limits(), kind, strictness);
    join->setSampleBlock(getSampleBlock().sortColumns());
    restore();
}


void StorageJoin::assertCompatible(ASTTableJoin::Kind kind_, ASTTableJoin::Strictness strictness_) const
{
    /// NOTE Could be more loose.
    if (!(kind == kind_ && strictness == strictness_))
        throw Exception("Table " + name + " has incompatible type of JOIN.", ErrorCodes::INCOMPATIBLE_TYPE_OF_JOIN);
}


void StorageJoin::insertBlock(const Block & block) { join->insertFromBlock(block); }
size_t StorageJoin::getSize() const { return join->getTotalRowCount(); };

}