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#pragma once
#include <Interpreters/Context_fwd.h>
#include <memory>
#include <string>
#include <unordered_map>
namespace DB
{
class Block;
class NamesAndTypesList;
class ColumnsDescription;
class ActionsDAG;
using ActionsDAGPtr = std::shared_ptr<ActionsDAG>;
/** Adds three types of columns into block
* 1. Columns, that are missed inside request, but present in table without defaults (missed columns)
* 2. Columns, that are missed inside request, but present in table with defaults (columns with default values)
* 3. Columns that materialized from other columns (materialized columns)
* Also can substitute NULL with DEFAULT value in case of INSERT SELECT query (null_as_default) if according setting is 1.
* All three types of columns are materialized (not constants).
*/
ActionsDAGPtr addMissingDefaults(
const Block & header, const NamesAndTypesList & required_columns,
const ColumnsDescription & columns, ContextPtr context, bool null_as_default = false);
}
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