ClickHouse/src/Interpreters/inplaceBlockConversions.h
2021-02-05 18:11:26 +03:00

30 lines
742 B
C++

#pragma once
#include <unordered_map>
#include <string>
namespace DB
{
class Block;
class Context;
class NamesAndTypesList;
class ColumnsDescription;
class ActionsDAG;
using ActionsDAGPtr = std::shared_ptr<ActionsDAG>;
/// Create actions which adds missing defaults to block according to required_columns using columns description.
ActionsDAGPtr evaluateMissingDefaults(
const Block & header,
const NamesAndTypesList & required_columns,
const ColumnsDescription & columns,
const Context & context, bool save_unneeded_columns = true);
/// Tries to convert columns in block to required_columns
void performRequiredConversions(Block & block,
const NamesAndTypesList & required_columns,
const Context & context);
}