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#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <Interpreters/RewriteSumIfFunctionVisitor.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTLiteral.h>
#include <Common/typeid_cast.h>
namespace DB
{
void RewriteSumIfFunctionMatcher::visit(ASTPtr & ast, Data & data)
{
if (auto * func = ast->as<ASTFunction>())
{
if (func->is_window_function)
return;
visit(*func, ast, data);
}
}
void RewriteSumIfFunctionMatcher::visit(const ASTFunction & func, ASTPtr & ast, Data &)
{
if (!func.arguments || func.arguments->children.empty())
return;
auto lower_name = Poco::toLower(func.name);
/// sumIf, SumIf or sUMIf are valid function names, but sumIF or sumiF are not
if (lower_name != "sum" && (lower_name != "sumif" || !endsWith(func.name, "If")))
return;
const auto & func_arguments = func.arguments->children;
if (lower_name == "sumif")
{
const auto * literal = func_arguments[0]->as<ASTLiteral>();
if (!literal || !DB::isInt64OrUInt64FieldType(literal->value.getType()))
return;
if (func_arguments.size() == 2)
{
std::shared_ptr<ASTFunction> new_func;
if (literal->value.get<UInt64>() == 1)
{
/// sumIf(1, cond) -> countIf(cond)
new_func = makeASTFunction("countIf", func_arguments[1]);
}
else
{
/// sumIf(123, cond) -> 123 * countIf(cond)
auto count_if_func = makeASTFunction("countIf", func_arguments[1]);
new_func = makeASTFunction("multiply", func_arguments[0], std::move(count_if_func));
}
new_func->setAlias(func.alias);
ast = std::move(new_func);
return;
}
}
else
{
const auto * nested_func = func_arguments[0]->as<ASTFunction>();
if (!nested_func || Poco::toLower(nested_func->name) != "if" || nested_func->arguments->children.size() != 3)
return;
const auto & if_arguments = nested_func->arguments->children;
const auto * first_literal = if_arguments[1]->as<ASTLiteral>();
const auto * second_literal = if_arguments[2]->as<ASTLiteral>();
if (first_literal && second_literal)
{
if (!DB::isInt64OrUInt64FieldType(first_literal->value.getType()) || !DB::isInt64OrUInt64FieldType(second_literal->value.getType()))
return;
auto first_value = first_literal->value.get<UInt64>();
auto second_value = second_literal->value.get<UInt64>();
std::shared_ptr<ASTFunction> new_func;
if (second_value == 0)
{
if (first_value == 1)
{
/// sum(if(cond, 1, 0)) -> countIf(cond)
new_func = makeASTFunction("countIf", if_arguments[0]);
}
else
{
/// sum(if(cond, 123, 0)) -> 123 * countIf(cond)
auto count_if_func = makeASTFunction("countIf", if_arguments[0]);
new_func = makeASTFunction("multiply", if_arguments[1], std::move(count_if_func));
}
new_func->setAlias(func.alias);
ast = std::move(new_func);
return;
}
if (first_value == 0)
{
auto not_func = makeASTFunction("not", if_arguments[0]);
if (second_value == 1)
{
/// sum(if(cond, 0, 1)) -> countIf(not(cond))
new_func = makeASTFunction("countIf", std::move(not_func));
}
else
{
/// sum(if(cond, 0, 123)) -> 123 * countIf(not(cond))
auto count_if_func = makeASTFunction("countIf", std::move(not_func));
new_func = makeASTFunction("multiply", if_arguments[2], std::move(count_if_func));
}
new_func->setAlias(func.alias);
ast = std::move(new_func);
return;
}
}
}
}
}
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