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#include <Analyzer/FunctionNode.h>
#include <Common/SipHash.h>
#include <Common/FieldVisitorToString.h>
#include <IO/WriteBufferFromString.h>
#include <IO/Operators.h>
#include <DataTypes/IDataType.h>
#include <DataTypes/DataTypeSet.h>
#include <Parsers/ASTFunction.h>
#include <Functions/IFunction.h>
#include <AggregateFunctions/IAggregateFunction.h>
#include <Analyzer/Utils.h>
#include <Analyzer/ConstantNode.h>
#include <Analyzer/IdentifierNode.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
FunctionNode::FunctionNode(String function_name_)
: IQueryTreeNode(children_size)
, function_name(function_name_)
{
children[parameters_child_index] = std::make_shared<ListNode>();
children[arguments_child_index] = std::make_shared<ListNode>();
}
const DataTypes & FunctionNode::getArgumentTypes() const
{
if (!function)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Function {} is not resolved",
function_name);
return function->getArgumentTypes();
}
ColumnsWithTypeAndName FunctionNode::getArgumentColumns() const
{
const auto & arguments = getArguments().getNodes();
size_t arguments_size = arguments.size();
ColumnsWithTypeAndName argument_columns;
argument_columns.reserve(arguments.size());
for (size_t i = 0; i < arguments_size; ++i)
{
const auto & argument = arguments[i];
ColumnWithTypeAndName argument_column;
if (isNameOfInFunction(function_name) && i == 1)
argument_column.type = std::make_shared<DataTypeSet>();
else
argument_column.type = argument->getResultType();
auto * constant = argument->as<ConstantNode>();
if (constant && !isNotCreatable(argument_column.type))
argument_column.column = argument_column.type->createColumnConst(1, constant->getValue());
argument_columns.push_back(std::move(argument_column));
}
return argument_columns;
}
void FunctionNode::resolveAsFunction(FunctionBasePtr function_value)
{
function_name = function_value->getName();
function = std::move(function_value);
kind = FunctionKind::ORDINARY;
}
void FunctionNode::resolveAsAggregateFunction(AggregateFunctionPtr aggregate_function_value)
{
function_name = aggregate_function_value->getName();
function = std::move(aggregate_function_value);
kind = FunctionKind::AGGREGATE;
}
void FunctionNode::resolveAsWindowFunction(AggregateFunctionPtr window_function_value)
{
if (!hasWindow())
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Trying to resolve FunctionNode without window definition as a window function {}", window_function_value->getName());
resolveAsAggregateFunction(window_function_value);
kind = FunctionKind::WINDOW;
}
void FunctionNode::dumpTreeImpl(WriteBuffer & buffer, FormatState & format_state, size_t indent) const
{
buffer << std::string(indent, ' ') << "FUNCTION id: " << format_state.getNodeId(this);
if (hasAlias())
buffer << ", alias: " << getAlias();
buffer << ", function_name: " << function_name;
std::string function_type = "ordinary";
if (isAggregateFunction())
function_type = "aggregate";
else if (isWindowFunction())
function_type = "window";
buffer << ", function_type: " << function_type;
if (function)
buffer << ", result_type: " + getResultType()->getName();
const auto & parameters = getParameters();
if (!parameters.getNodes().empty())
{
buffer << '\n' << std::string(indent + 2, ' ') << "PARAMETERS\n";
parameters.dumpTreeImpl(buffer, format_state, indent + 4);
}
const auto & arguments = getArguments();
if (!arguments.getNodes().empty())
{
buffer << '\n' << std::string(indent + 2, ' ') << "ARGUMENTS\n";
arguments.dumpTreeImpl(buffer, format_state, indent + 4);
}
if (hasWindow())
{
buffer << '\n' << std::string(indent + 2, ' ') << "WINDOW\n";
getWindowNode()->dumpTreeImpl(buffer, format_state, indent + 4);
}
}
bool FunctionNode::isEqualImpl(const IQueryTreeNode & rhs) const
{
const auto & rhs_typed = assert_cast<const FunctionNode &>(rhs);
if (function_name != rhs_typed.function_name ||
isAggregateFunction() != rhs_typed.isAggregateFunction() ||
isOrdinaryFunction() != rhs_typed.isOrdinaryFunction() ||
isWindowFunction() != rhs_typed.isWindowFunction())
return false;
if (isResolved() != rhs_typed.isResolved())
return false;
if (!isResolved())
return true;
auto lhs_result_type = getResultType();
auto rhs_result_type = rhs.getResultType();
if (lhs_result_type && rhs_result_type && !lhs_result_type->equals(*rhs_result_type))
return false;
else if (lhs_result_type && !rhs_result_type)
return false;
else if (!lhs_result_type && rhs_result_type)
return false;
return true;
}
void FunctionNode::updateTreeHashImpl(HashState & hash_state) const
{
hash_state.update(function_name.size());
hash_state.update(function_name);
hash_state.update(isOrdinaryFunction());
hash_state.update(isAggregateFunction());
hash_state.update(isWindowFunction());
if (!isResolved())
return;
if (auto result_type = getResultType())
{
auto result_type_name = result_type->getName();
hash_state.update(result_type_name.size());
hash_state.update(result_type_name);
}
}
QueryTreeNodePtr FunctionNode::cloneImpl() const
{
auto result_function = std::make_shared<FunctionNode>(function_name);
/** This is valid for clone method to reuse same function pointers
* because ordinary functions or aggregate functions must be stateless.
*/
result_function->function = function;
result_function->kind = kind;
result_function->wrap_with_nullable = wrap_with_nullable;
return result_function;
}
ASTPtr FunctionNode::toASTImpl(const ConvertToASTOptions & options) const
{
auto function_ast = std::make_shared<ASTFunction>();
function_ast->name = function_name;
if (isWindowFunction())
{
function_ast->is_window_function = true;
function_ast->kind = ASTFunction::Kind::WINDOW_FUNCTION;
}
auto new_options = options;
/// To avoid surrounding constants with several internal casts.
if (function_name == "_CAST" && (*getArguments().begin())->getNodeType() == QueryTreeNodeType::CONSTANT)
new_options.add_cast_for_constants = false;
const auto & parameters = getParameters();
if (!parameters.getNodes().empty())
{
function_ast->children.push_back(parameters.toAST(new_options));
function_ast->parameters = function_ast->children.back();
}
const auto & arguments = getArguments();
function_ast->children.push_back(arguments.toAST(new_options));
function_ast->arguments = function_ast->children.back();
auto window_node = getWindowNode();
if (window_node)
{
if (auto * identifier_node = window_node->as<IdentifierNode>())
function_ast->window_name = identifier_node->getIdentifier().getFullName();
else
function_ast->window_definition = window_node->toAST(new_options);
}
return function_ast;
}
}
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