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#include <Storages/StorageSnapshot.h>
#include <Storages/LightweightDeleteDescription.h>
#include <Storages/IStorage.h>
#include <DataTypes/ObjectUtils.h>
#include <DataTypes/NestedUtils.h>
#include <Storages/StorageView.h>
#include <sparsehash/dense_hash_set>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_FOUND_COLUMN_IN_BLOCK;
extern const int EMPTY_LIST_OF_COLUMNS_QUERIED;
extern const int NO_SUCH_COLUMN_IN_TABLE;
extern const int COLUMN_QUERIED_MORE_THAN_ONCE;
}
void StorageSnapshot::init()
{
for (const auto & [name, type] : storage.getVirtuals())
virtual_columns[name] = type;
if (storage.hasLightweightDeletedMask())
system_columns[LightweightDeleteDescription::FILTER_COLUMN.name] = LightweightDeleteDescription::FILTER_COLUMN.type;
}
NamesAndTypesList StorageSnapshot::getColumns(const GetColumnsOptions & options) const
{
auto all_columns = getMetadataForQuery()->getColumns().get(options);
if (options.with_extended_objects)
extendObjectColumns(all_columns, object_columns, options.with_subcolumns);
NameSet column_names;
if (options.with_virtuals)
{
/// Virtual columns must be appended after ordinary,
/// because user can override them.
if (!virtual_columns.empty())
{
for (const auto & column : all_columns)
column_names.insert(column.name);
for (const auto & [name, type] : virtual_columns)
if (!column_names.contains(name))
all_columns.emplace_back(name, type);
}
}
if (options.with_system_columns)
{
if (!system_columns.empty() && column_names.empty())
{
for (const auto & column : all_columns)
column_names.insert(column.name);
}
for (const auto & [name, type] : system_columns)
if (!column_names.contains(name))
all_columns.emplace_back(name, type);
}
return all_columns;
}
NamesAndTypesList StorageSnapshot::getColumnsByNames(const GetColumnsOptions & options, const Names & names) const
{
NamesAndTypesList res;
for (const auto & name : names)
res.push_back(getColumn(options, name));
return res;
}
std::optional<NameAndTypePair> StorageSnapshot::tryGetColumn(const GetColumnsOptions & options, const String & column_name) const
{
const auto & columns = getMetadataForQuery()->getColumns();
auto column = columns.tryGetColumn(options, column_name);
if (column && (!column->type->hasDynamicSubcolumns() || !options.with_extended_objects))
return column;
if (options.with_extended_objects)
{
auto object_column = object_columns.tryGetColumn(options, column_name);
if (object_column)
return object_column;
}
if (options.with_virtuals)
{
auto it = virtual_columns.find(column_name);
if (it != virtual_columns.end())
return NameAndTypePair(column_name, it->second);
}
if (options.with_system_columns)
{
auto it = system_columns.find(column_name);
if (it != system_columns.end())
return NameAndTypePair(column_name, it->second);
}
return {};
}
NameAndTypePair StorageSnapshot::getColumn(const GetColumnsOptions & options, const String & column_name) const
{
auto column = tryGetColumn(options, column_name);
if (!column)
throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "There is no column {} in table", column_name);
return *column;
}
Block StorageSnapshot::getSampleBlockForColumns(const Names & column_names) const
{
Block res;
const auto & columns = getMetadataForQuery()->getColumns();
for (const auto & column_name : column_names)
{
auto column = columns.tryGetColumnOrSubcolumn(GetColumnsOptions::All, column_name);
auto object_column = object_columns.tryGetColumnOrSubcolumn(GetColumnsOptions::All, column_name);
if (column && !object_column)
{
res.insert({column->type->createColumn(), column->type, column_name});
}
else if (object_column)
{
res.insert({object_column->type->createColumn(), object_column->type, column_name});
}
else if (auto it = virtual_columns.find(column_name); it != virtual_columns.end())
{
/// Virtual columns must be appended after ordinary, because user can
/// override them.
const auto & type = it->second;
res.insert({type->createColumn(), type, column_name});
}
else
{
throw Exception(ErrorCodes::NOT_FOUND_COLUMN_IN_BLOCK,
"Column {} not found in table {}", backQuote(column_name), storage.getStorageID().getNameForLogs());
}
}
return res;
}
ColumnsDescription StorageSnapshot::getDescriptionForColumns(const Names & column_names) const
{
ColumnsDescription res;
const auto & columns = getMetadataForQuery()->getColumns();
for (const auto & name : column_names)
{
auto column = columns.tryGetColumnOrSubcolumnDescription(GetColumnsOptions::All, name);
auto object_column = object_columns.tryGetColumnOrSubcolumnDescription(GetColumnsOptions::All, name);
if (column && !object_column)
{
res.add(*column, "", false, false);
}
else if (object_column)
{
res.add(*object_column, "", false, false);
}
else if (auto it = virtual_columns.find(name); it != virtual_columns.end())
{
/// Virtual columns must be appended after ordinary, because user can
/// override them.
const auto & type = it->second;
res.add({name, type});
}
else
{
throw Exception(ErrorCodes::NOT_FOUND_COLUMN_IN_BLOCK,
"Column {} not found in table {}", backQuote(name), storage.getStorageID().getNameForLogs());
}
}
return res;
}
namespace
{
using DenseHashSet = google::dense_hash_set<StringRef, StringRefHash>;
}
void StorageSnapshot::check(const Names & column_names) const
{
const auto & columns = getMetadataForQuery()->getColumns();
auto options = GetColumnsOptions(GetColumnsOptions::AllPhysical).withSubcolumns();
if (column_names.empty())
{
auto list_of_columns = listOfColumns(columns.get(options));
throw Exception(ErrorCodes::EMPTY_LIST_OF_COLUMNS_QUERIED,
"Empty list of columns queried. There are columns: {}", list_of_columns);
}
DenseHashSet unique_names;
unique_names.set_empty_key(StringRef());
for (const auto & name : column_names)
{
bool has_column = columns.hasColumnOrSubcolumn(GetColumnsOptions::AllPhysical, name)
|| object_columns.hasColumnOrSubcolumn(GetColumnsOptions::AllPhysical, name)
|| virtual_columns.contains(name);
if (!has_column)
{
auto list_of_columns = listOfColumns(columns.get(options));
throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE,
"There is no column with name {} in table {}. There are columns: {}",
backQuote(name), storage.getStorageID().getNameForLogs(), list_of_columns);
}
if (unique_names.count(name))
throw Exception(ErrorCodes::COLUMN_QUERIED_MORE_THAN_ONCE, "Column {} queried more than once", name);
unique_names.insert(name);
}
}
DataTypePtr StorageSnapshot::getConcreteType(const String & column_name) const
{
auto object_column = object_columns.tryGetColumnOrSubcolumn(GetColumnsOptions::All, column_name);
if (object_column)
return object_column->type;
return metadata->getColumns().get(column_name).type;
}
}
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