dbms: more read write functions for DataTypeAggregateFunction and ColumnAggregateFunction [METR-10894]

dbms/include/DB/AggregateFunctions/AggregateFunctionMerge.h

@@ -83,7 +83,7 @@ public:
 	{
 		Field field;
 		columns[0]->get(row_num, field);
-		ReadBufferFromString read_buffer(field.safeGet<String>());
+		ReadBufferFromString read_buffer(field.safeGet<String &>());
 		nested_func->deserializeMerge(place, read_buffer);
 	}
 

dbms/include/DB/AggregateFunctions/AggregateFunctionState.h

@@ -101,7 +101,7 @@ public:
 	}
 
 	/// Для аггрегатных функции типа state никогда не нужно вызывать insertResultInto
-	bool isFinal() const { return false; }
+	bool canBeFinal() const { return false; }
 
 };
 

dbms/include/DB/AggregateFunctions/AggregateFunctionSum.h

@@ -62,6 +62,18 @@ public:
 		this->data(place).sum += tmp;
 	}
 
+	void serializeText(ConstAggregateDataPtr place, WriteBuffer & buf) const
+	{
+		writeText(this->data(place).sum, buf);
+	}
+
+	void deserializeMergeText(AggregateDataPtr place, ReadBuffer & buf) const
+	{
+		typename NearestFieldType<T>::Type tmp;
+		readText(tmp, buf);
+		this->data(place).sum += tmp;
+	}
+
 	void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const
 	{
 		static_cast<ColumnVector<typename NearestFieldType<T>::Type> &>(to).getData().push_back(this->data(place).sum);

dbms/include/DB/AggregateFunctions/AggregateFunctionsMinMax.h

@@ -116,6 +116,42 @@ public:
 		}
 	}
 
+	void serializeText(ConstAggregateDataPtr place, WriteBuffer & buf) const
+	{
+		const Data & d = this->data(place);
+
+		if (unlikely(d.value.isNull()))
+		{
+			writeText(false, buf);
+		}
+		else
+		{
+			writeText(true, buf);
+			type->serializeText(this->data(place).value, buf);
+		}
+	}
+
+	void deserializeMergeText(AggregateDataPtr place, ReadBuffer & buf) const
+	{
+		Data & d = this->data(place);
+
+		bool is_not_null = false;
+		readText(is_not_null, buf);
+
+		if (is_not_null)
+		{
+			if (!d.value.isNull())
+			{
+				Field value_;
+				type->deserializeText(value_, buf);
+				if (Traits::better(value_, d.value))
+					d.value = value_;
+			}
+			else
+				type->deserializeText(d.value, buf);
+		}
+	}
+
 	void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const
 	{
 		if (unlikely(this->data(place).value.isNull()))

dbms/include/DB/AggregateFunctions/IAggregateFunction.h

@@ -82,11 +82,23 @@ public:
 	/// Десериализовать состояние и объединить своё состояние с ним.
 	virtual void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const = 0;
 
+	/// Сериализовать состояние в текстовом виде (а не в бинарном, как в функции serialize). Нельзя сериализовывать "пустое" состояние.
+	virtual void serializeText(ConstAggregateDataPtr place, WriteBuffer & buf) const
+	{
+		throw Exception("Method serializeText is not supported for " + getName() + ".", ErrorCodes::NOT_IMPLEMENTED);
+	}
+
+	/// Десериализовать текстовое состояние и объединить своё состояние с ним.
+	virtual void deserializeMergeText(AggregateDataPtr place, ReadBuffer & buf) const
+	{
+		throw Exception("Method deserializeMergeText is not supported for " + getName() + ".", ErrorCodes::NOT_IMPLEMENTED);
+	}
+
 	/// Вставить результат в столбец.
 	virtual void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const = 0;
 
 	/// Можно ли вызывать метод insertResultInto, или всегда нужно запоминать состояние.
-	virtual bool isFinal() const { return true; }
+	virtual bool canBeFinal() const { return true; }
 };
 
 

dbms/include/DB/Columns/ColumnAggregateFunction.h

@@ -6,6 +6,9 @@
 
 #include <DB/Columns/ColumnVector.h>
 
+#include <DB/Core/Field.h>
+
+#include <DB/IO/ReadBufferFromString.h>
 
 namespace DB
 {
@@ -78,31 +81,40 @@ public:
 
 	Field operator[](size_t n) const
 	{
-		String buffer_string;
+		Field field = String();
-		WriteBufferFromString buffer(buffer_string);
+		{
+			WriteBufferFromString buffer(field.get<String &>());
 			func->serialize(data[n], buffer);
-		return Field(buffer_string);
+		}
+		return field;
 	}
 
 	void get(size_t n, Field & res) const
 	{
-		String buffer_string;
+		res.assignString("", 0);
-		WriteBufferFromString buffer(buffer_string);
+		{
+			WriteBufferFromString buffer(res.get<String &>());
 			func->serialize(data[n], buffer);
-		res = buffer_string;
+		}
 	}
 
 	StringRef getDataAt(size_t n) const
 	{
-		String buffer_string;
+		return StringRef(reinterpret_cast<const char *>(&data[n]), sizeof(data[n]));
-		WriteBufferFromString buffer(buffer_string);
+	}
-		func->serialize(data[n], buffer);
+
-		return StringRef(buffer_string);
+	void insert(const Field & x)
+	{
+		insertDefault();
+		ReadBufferFromString read_buffer(x.safeGet<const String &>());
+		func->deserializeMerge(data[data.size()-1], read_buffer);
 	}
 
 	void insertData(const char * pos, size_t length)
 	{
-		throw Exception("Method insertData is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
+		insertDefault();
+		ReadBuffer read_buffer(const_cast<char *>(pos), length);
+		func->deserializeMerge(data[data.size()-1], read_buffer);
 	}
 	
 	ColumnPtr cut(size_t start, size_t length) const
@@ -125,12 +137,6 @@ public:
 		throw Exception("Method replicate is not supported for ColumnAggregateFunction.", ErrorCodes::NOT_IMPLEMENTED);
 	}
 
-	void insert(const Field & x)
-	{
-		throw Exception("Method insert is not supported for ColumnAggregateFunction. You must access underlying vector directly.",
-			ErrorCodes::NOT_IMPLEMENTED);
-	}
-
 	void getExtremes(Field & min, Field & max) const
 	{
 		throw Exception("Method getExtremes is not supported for ColumnAggregateFunction.", ErrorCodes::NOT_IMPLEMENTED);

dbms/src/DataTypes/DataTypeAggregateFunction.cpp

@@ -15,12 +15,19 @@ using Poco::SharedPtr;
 
 void DataTypeAggregateFunction::serializeBinary(const Field & field, WriteBuffer & ostr) const
 {
-	throw Exception("Serialization of individual aggregate functions is not supported", ErrorCodes::NOT_IMPLEMENTED);
+	const String & s = get<const String &>(field);
+	writeVarUInt(s.size(), ostr);
+	writeString(s, ostr);
 }
 
 void DataTypeAggregateFunction::deserializeBinary(Field & field, ReadBuffer & istr) const
 {
-	throw Exception("Deserialization of individual aggregate functions is not supported", ErrorCodes::NOT_IMPLEMENTED);
+	UInt64 size;
+	readVarUInt(size, istr);
+	field = String();
+	String & s = get<String &>(field);
+	s.resize(size);
+	istr.readStrict(&s[0], size);
 }
 
 void DataTypeAggregateFunction::serializeBinary(const IColumn & column, WriteBuffer & ostr, size_t offset, size_t limit) const
@@ -66,37 +73,46 @@ void DataTypeAggregateFunction::deserializeBinary(IColumn & column, ReadBuffer &
 
 void DataTypeAggregateFunction::serializeText(const Field & field, WriteBuffer & ostr) const
 {
-	throw Exception("Cannot write aggregate function as text.", ErrorCodes::CANNOT_WRITE_AGGREGATE_FUNCTION_AS_TEXT);
+	writeString(get<const String &>(field), ostr);
 }
 
+
 void DataTypeAggregateFunction::deserializeText(Field & field, ReadBuffer & istr) const
 {
-	throw Exception("Cannot read aggregate function from text.", ErrorCodes::CANNOT_READ_AGGREGATE_FUNCTION_FROM_TEXT);
+	field.assignString("", 0);
+	readString(get<String &>(field), istr);
 }
 
+
 void DataTypeAggregateFunction::serializeTextEscaped(const Field & field, WriteBuffer & ostr) const
 {
-	throw Exception("Cannot write aggregate function as text.", ErrorCodes::CANNOT_WRITE_AGGREGATE_FUNCTION_AS_TEXT);
+	writeEscapedString(get<const String &>(field), ostr);
 }
 
+
 void DataTypeAggregateFunction::deserializeTextEscaped(Field & field, ReadBuffer & istr) const
 {
-	throw Exception("Cannot read aggregate function from text.", ErrorCodes::CANNOT_READ_AGGREGATE_FUNCTION_FROM_TEXT);
+	field.assignString("", 0);
+	readEscapedString(get<String &>(field), istr);
 }
 
+
 void DataTypeAggregateFunction::serializeTextQuoted(const Field & field, WriteBuffer & ostr) const
 {
-	throw Exception("Cannot write aggregate function as text.", ErrorCodes::CANNOT_WRITE_AGGREGATE_FUNCTION_AS_TEXT);
+	writeQuotedString(get<const String &>(field), ostr);
 }
 
+
 void DataTypeAggregateFunction::deserializeTextQuoted(Field & field, ReadBuffer & istr) const
 {
-	throw Exception("Cannot read aggregate function from text.", ErrorCodes::CANNOT_READ_AGGREGATE_FUNCTION_FROM_TEXT);
+	field.assignString("", 0);
+	readQuotedString(get<String &>(field), istr);
 }
 
+
 void DataTypeAggregateFunction::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
 {
-	throw Exception("Cannot write aggregate function as text.", ErrorCodes::CANNOT_WRITE_AGGREGATE_FUNCTION_AS_TEXT);
+	writeJSONString(get<const String &>(field), ostr);
 }
 
 ColumnPtr DataTypeAggregateFunction::createColumn() const

dbms/src/Interpreters/Aggregator.cpp

@@ -235,33 +235,19 @@ void Aggregator::convertToBlockImpl(
 	size_t start_row,
 	bool final) const
 {
-//	if (!final || !aggregate_functions[i]->isFinal()) {
 	size_t j = start_row;
 	for (typename Method::const_iterator it = method.data.begin(); it != method.data.end(); ++it, ++j)
 	{
 		method.insertKeyIntoColumns(it, key_columns, keys_size, key_sizes);
 
 		for (size_t i = 0; i < aggregates_size; ++i)
-				if (!final || !aggregate_functions[i]->isFinal())
+			if (!final || !aggregate_functions[i]->canBeFinal())
 				(*aggregate_columns[i])[j] = Method::getAggregateData(it->second) + offsets_of_aggregate_states[i];
 			else
 				aggregate_functions[i]->insertResultInto(
 					Method::getAggregateData(it->second) + offsets_of_aggregate_states[i],
 					*final_aggregate_columns[i]);
 	}
-/*	}
-	else
-	{
-		for (typename Method::const_iterator it = method.data.begin(); it != method.data.end(); ++it)
-		{
-			method.insertKeyIntoColumns(it, key_columns, keys_size, key_sizes);
-
-			for (size_t i = 0; i < aggregates_size; ++i)
-				aggregate_functions[i]->insertResultInto(
-					Method::getAggregateData(it->second) + offsets_of_aggregate_states[i],
-					*final_aggregate_columns[i]);
-		}
-	}*/
 }
 
 
@@ -345,7 +331,8 @@ void Aggregator::destroyImpl(
 	for (typename Method::const_iterator it = method.data.begin(); it != method.data.end(); ++it)
 	{
 		for (size_t i = 0; i < aggregates_size; ++i)
-			if (aggregate_functions[i]->isFinal())
+			/// Если аггрегатная функция не может быть финализирована, то за ее удаление отвечает ColumnAggregateFunction
+			if (aggregate_functions[i]->canBeFinal())
 			{
 				char * data = Method::getAggregateData(it->second);
 
@@ -543,7 +530,7 @@ Block Aggregator::convertToBlock(AggregatedDataVariants & data_variants, bool fi
 
 	for (size_t i = 0; i < aggregates_size; ++i)
 	{
-		if (!final || !aggregate_functions[i]->isFinal())
+		if (!final || !aggregate_functions[i]->canBeFinal())
 		{
 			/// Столбец ColumnAggregateFunction захватывает разделяемое владение ареной с состояниями агрегатных функций.
 			ColumnAggregateFunction & column_aggregate_func = static_cast<ColumnAggregateFunction &>(*res.getByPosition(i + keys_size).column);
@@ -570,7 +557,7 @@ Block Aggregator::convertToBlock(AggregatedDataVariants & data_variants, bool fi
 		AggregatedDataWithoutKey & data = data_variants.without_key;
 
 		for (size_t i = 0; i < aggregates_size; ++i)
-			if (!final || !aggregate_functions[i]->isFinal())
+			if (!final || !aggregate_functions[i]->canBeFinal())
 				(*aggregate_columns[i])[0] = data + offsets_of_aggregate_states[i];
 			else
 				aggregate_functions[i]->insertResultInto(data + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
@@ -787,7 +774,8 @@ void Aggregator::destroyAllAggregateStates(AggregatedDataVariants & result)
 		AggregatedDataWithoutKey & res_data = result.without_key;
 
 		for (size_t i = 0; i < aggregates_size; ++i)
-			if (aggregate_functions[i]->isFinal())
+			/// Если аггрегатная функция не может быть финализирована, то за ее удаление отвечает ColumnAggregateFunction
+			if (aggregate_functions[i]->canBeFinal())
 				aggregate_functions[i]->destroy(res_data + offsets_of_aggregate_states[i]);
 	}