ClickHouse/src/Interpreters/getColumnFromBlock.h

#pragma once
#include <Core/Block.h>

namespace DB
{

/// Helps in-memory storages to extract columns from block.
/// Properly handles cases, when column is a subcolumn and when it is compressed.
ColumnPtr getColumnFromBlock(const Block & block, const NameAndTypePair & requested_column);

ColumnPtr tryGetColumnFromBlock(const Block & block, const NameAndTypePair & requested_column);

}