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#pragma once
#include <Core/Names.h>
#include <Interpreters/Context_fwd.h>
#include <Common/COW.h>
#include <memory>
#include <string>
#include <unordered_map>
namespace DB
{
class Block;
class NamesAndTypesList;
class ColumnsDescription;
class IColumn;
using ColumnPtr = COW<IColumn>::Ptr;
using Columns = std::vector<ColumnPtr>;
struct StorageInMemoryMetadata;
using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
class ActionsDAG;
using ActionsDAGPtr = std::shared_ptr<ActionsDAG>;
/// Create actions which adds missing defaults to block according to required_columns using columns description
/// or substitute NULL into DEFAULT value in case of INSERT SELECT query (null_as_default) if according setting is 1.
/// Return nullptr if no actions required.
ActionsDAGPtr evaluateMissingDefaults(
const Block & header,
const NamesAndTypesList & required_columns,
const ColumnsDescription & columns,
ContextPtr context,
bool save_unneeded_columns = true,
bool null_as_default = false);
/// Tries to convert columns in block to required_columns
void performRequiredConversions(Block & block, const NamesAndTypesList & required_columns, ContextPtr context);
void fillMissingColumns(
Columns & res_columns,
size_t num_rows,
const NamesAndTypesList & requested_columns,
const NamesAndTypesList & available_columns,
const NameSet & partially_read_columns,
StorageMetadataPtr metadata_snapshot);
}
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