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#pragma once
#include <Functions/IFunction.h>
#include <Interpreters/Context_fwd.h>
#include <Storages/IStorage_fwd.h>
#include <Storages/TableLockHolder.h>
#include <Core/Block.h>
namespace DB
{
class HashJoin;
class StorageJoin;
using StorageJoinPtr = std::shared_ptr<StorageJoin>;
template <bool or_null>
class ExecutableFunctionJoinGet final : public IExecutableFunction, WithContext
{
public:
ExecutableFunctionJoinGet(ContextPtr context_,
TableLockHolder table_lock_,
StorageJoinPtr storage_join_,
const DB::Block & result_columns_)
: WithContext(context_)
, table_lock(std::move(table_lock_))
, storage_join(std::move(storage_join_))
, result_columns(result_columns_)
{}
static constexpr auto name = or_null ? "joinGetOrNull" : "joinGet";
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override;
String getName() const override { return name; }
private:
TableLockHolder table_lock;
StorageJoinPtr storage_join;
DB::Block result_columns;
};
template <bool or_null>
class FunctionJoinGet final : public IFunctionBase, WithContext
{
public:
static constexpr auto name = or_null ? "joinGetOrNull" : "joinGet";
FunctionJoinGet(ContextPtr context_,
TableLockHolder table_lock_,
StorageJoinPtr storage_join_, String attr_name_,
DataTypes argument_types_, DataTypePtr return_type_)
: WithContext(context_)
, table_lock(std::move(table_lock_))
, storage_join(storage_join_)
, attr_name(std::move(attr_name_))
, argument_types(std::move(argument_types_))
, return_type(std::move(return_type_))
{
}
String getName() const override { return name; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
const DataTypes & getArgumentTypes() const override { return argument_types; }
const DataTypePtr & getResultType() const override { return return_type; }
ExecutableFunctionPtr prepare(const ColumnsWithTypeAndName &) const override;
private:
TableLockHolder table_lock;
StorageJoinPtr storage_join;
const String attr_name;
DataTypes argument_types;
DataTypePtr return_type;
};
template <bool or_null>
class JoinGetOverloadResolver final : public IFunctionOverloadResolver, WithContext
{
public:
static constexpr auto name = or_null ? "joinGetOrNull" : "joinGet";
static FunctionOverloadResolverPtr create(ContextPtr context_) { return std::make_unique<JoinGetOverloadResolver>(context_); }
explicit JoinGetOverloadResolver(ContextPtr context_) : WithContext(context_) {}
bool isDeterministic() const override { return false; }
String getName() const override { return name; }
FunctionBasePtr buildImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &) const override;
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName &) const override { return {}; } // Not used
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0, 1}; }
};
}
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