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#pragma once
#include <Processors/ISimpleTransform.h>
#include <Processors/Transforms/finalizeChunk.h>
namespace DB
{
class ExpressionActions;
using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
class ActionsDAG;
enum class TotalsMode;
/** Takes blocks after grouping, with non-finalized aggregate functions.
* Calculates total values according to totals_mode.
* If necessary, evaluates the expression from HAVING and filters rows. Returns the finalized and filtered blocks.
*/
class TotalsHavingTransform : public ISimpleTransform
{
public:
TotalsHavingTransform(
const Block & header,
const ColumnsMask & aggregates_mask_,
bool overflow_row_,
const ExpressionActionsPtr & expression_,
const std::string & filter_column_,
bool remove_filter_,
TotalsMode totals_mode_,
double auto_include_threshold_,
bool final_);
String getName() const override { return "TotalsHavingTransform"; }
OutputPort & getTotalsPort() { return outputs.back(); }
Status prepare() override;
void work() override;
bool hasFilter() const { return !filter_column_name.empty(); }
static Block transformHeader(Block block, const ActionsDAG * expression, const std::string & filter_column_name, bool remove_filter, bool final, const ColumnsMask & aggregates_mask);
protected:
void transform(Chunk & chunk) override;
bool finished_transform = false;
bool total_prepared = false;
Chunk totals;
private:
void addToTotals(const Chunk & chunk, const IColumn::Filter * filter);
void prepareTotals();
/// Params
const ColumnsMask aggregates_mask;
bool overflow_row;
ExpressionActionsPtr expression;
String filter_column_name;
bool remove_filter;
TotalsMode totals_mode;
double auto_include_threshold;
bool final;
size_t passed_keys = 0;
size_t total_keys = 0;
size_t filter_column_pos = 0;
Block finalized_header;
/// Here are the values that did not pass max_rows_to_group_by.
/// They are added or not added to the current_totals, depending on the totals_mode.
Chunk overflow_aggregates;
/// Here, total values are accumulated. After the work is finished, they will be placed in totals.
MutableColumns current_totals;
};
}
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