ClickHouse/src/Storages/StorageInMemoryMetadata.cpp

#include <Storages/StorageInMemoryMetadata.h>

namespace DB
{

StorageInMemoryMetadata::StorageInMemoryMetadata(
    const ColumnsDescription & columns_,
    const IndicesDescription & secondary_indices_,
    const ConstraintsDescription & constraints_)
    : columns(columns_)
    , secondary_indices(secondary_indices_)
    , constraints(constraints_)
{
}

StorageInMemoryMetadata::StorageInMemoryMetadata(const StorageInMemoryMetadata & other)
    : columns(other.columns)
    , secondary_indices(other.secondary_indices)
    , constraints(other.constraints)
    , partition_key(other.partition_key)
    , primary_key(other.primary_key)
    , sorting_key(other.sorting_key)
    , sampling_key(other.sampling_key)
    , column_ttls_by_name(other.column_ttls_by_name)
    , table_ttl(other.table_ttl)
    , settings_changes(other.settings_changes ? other.settings_changes->clone() : nullptr)
    , select(other.select)
{
}

StorageInMemoryMetadata & StorageInMemoryMetadata::operator=(const StorageInMemoryMetadata & other)
{
    if (&other == this)
        return *this;

    columns = other.columns;
    secondary_indices = other.secondary_indices;
    constraints = other.constraints;
    partition_key = other.partition_key;
    primary_key = other.primary_key;
    sorting_key = other.sorting_key;
    sampling_key = other.sampling_key;
    column_ttls_by_name = other.column_ttls_by_name;
    table_ttl = other.table_ttl;
    if (other.settings_changes)
        settings_changes = other.settings_changes->clone();
    else
        settings_changes.reset();
    select = other.select;
    return *this;
}


void StorageInMemoryMetadata::setColumns(ColumnsDescription columns_)
{
    columns = std::move(columns_);
}

void StorageInMemoryMetadata::setSecondaryIndices(IndicesDescription secondary_indices_)
{
    secondary_indices = std::move(secondary_indices_);
}

void StorageInMemoryMetadata::setConstraints(ConstraintsDescription constraints_)
{
    constraints = std::move(constraints_);
}

void StorageInMemoryMetadata::setTableTTLs(const TTLTableDescription & table_ttl_)
{
    table_ttl = table_ttl_;
}

void StorageInMemoryMetadata::setColumnTTLs(const TTLColumnsDescription & column_ttls_by_name_)
{
    column_ttls_by_name = column_ttls_by_name_;
}

void StorageInMemoryMetadata::setSettingsChanges(const ASTPtr & settings_changes_)
{
    if (settings_changes_)
        settings_changes = settings_changes_;
    else
        settings_changes = nullptr;
}

void StorageInMemoryMetadata::setSelectQuery(const SelectQueryDescription & select_)
{
    select = select_;
}

const ColumnsDescription & StorageInMemoryMetadata::getColumns() const
{
    return columns;
}

const IndicesDescription & StorageInMemoryMetadata::getSecondaryIndices() const
{
    return secondary_indices;
}

bool StorageInMemoryMetadata::hasSecondaryIndices() const
{
    return !secondary_indices.empty();
}

const ConstraintsDescription & StorageInMemoryMetadata::getConstraints() const
{
    return constraints;
}

TTLTableDescription StorageInMemoryMetadata::getTableTTLs() const
{
    return table_ttl;
}

bool StorageInMemoryMetadata::hasAnyTableTTL() const
{
    return hasAnyMoveTTL() || hasRowsTTL();
}

TTLColumnsDescription StorageInMemoryMetadata::getColumnTTLs() const
{
    return column_ttls_by_name;
}

bool StorageInMemoryMetadata::hasAnyColumnTTL() const
{
    return !column_ttls_by_name.empty();
}

TTLDescription StorageInMemoryMetadata::getRowsTTL() const
{
    return table_ttl.rows_ttl;
}

bool StorageInMemoryMetadata::hasRowsTTL() const
{
    return table_ttl.rows_ttl.expression != nullptr;
}

TTLDescriptions StorageInMemoryMetadata::getMoveTTLs() const
{
    return table_ttl.move_ttl;
}

bool StorageInMemoryMetadata::hasAnyMoveTTL() const
{
    return !table_ttl.move_ttl.empty();
}

ColumnDependencies StorageInMemoryMetadata::getColumnDependencies(const NameSet & updated_columns) const
{
    if (updated_columns.empty())
        return {};

    ColumnDependencies res;

    NameSet indices_columns;
    NameSet required_ttl_columns;
    NameSet updated_ttl_columns;

    auto add_dependent_columns = [&updated_columns](const auto & expression, auto & to_set)
    {
        auto requiered_columns = expression->getRequiredColumns();
        for (const auto & dependency : requiered_columns)
        {
            if (updated_columns.count(dependency))
            {
                to_set.insert(requiered_columns.begin(), requiered_columns.end());
                return true;
            }
        }

        return false;
    };

    for (const auto & index : getSecondaryIndices())
        add_dependent_columns(index.expression, indices_columns);

    if (hasRowsTTL())
    {
        auto rows_expression = getRowsTTL().expression;
        if (add_dependent_columns(rows_expression, required_ttl_columns))
        {
            /// Filter all columns, if rows TTL expression have to be recalculated.
            for (const auto & column : getColumns().getAllPhysical())
                updated_ttl_columns.insert(column.name);
        }
    }

    for (const auto & [name, entry] : getColumnTTLs())
    {
        if (add_dependent_columns(entry.expression, required_ttl_columns))
            updated_ttl_columns.insert(name);
    }

    for (const auto & entry : getMoveTTLs())
        add_dependent_columns(entry.expression, required_ttl_columns);

    for (const auto & column : indices_columns)
        res.emplace(column, ColumnDependency::SKIP_INDEX);
    for (const auto & column : required_ttl_columns)
        res.emplace(column, ColumnDependency::TTL_EXPRESSION);
    for (const auto & column : updated_ttl_columns)
        res.emplace(column, ColumnDependency::TTL_TARGET);

    return res;

}

Block StorageInMemoryMetadata::getSampleBlockNonMaterialized() const
{
    Block res;

    for (const auto & column : getColumns().getOrdinary())
        res.insert({column.type->createColumn(), column.type, column.name});

    return res;
}
}