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#pragma once
#include <array>
#include <base/constexpr_helpers.h>
#include <Interpreters/HashJoin.h>
/** Used in implementation of Join to process different data structures.
*/
namespace DB
{
template <JoinKind kind, JoinStrictness join_strictness>
struct MapGetter;
template <> struct MapGetter<JoinKind::Left, JoinStrictness::RightAny> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Inner, JoinStrictness::RightAny> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Right, JoinStrictness::RightAny> { using Map = HashJoin::MapsOne; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Full, JoinStrictness::RightAny> { using Map = HashJoin::MapsOne; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Left, JoinStrictness::Any> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Inner, JoinStrictness::Any> { using Map = HashJoin::MapsOne; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Right, JoinStrictness::Any> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Full, JoinStrictness::Any> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Left, JoinStrictness::All> { using Map = HashJoin::MapsAll; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Inner, JoinStrictness::All> { using Map = HashJoin::MapsAll; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Right, JoinStrictness::All> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Full, JoinStrictness::All> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
/// Only SEMI LEFT and SEMI RIGHT are valid. INNER and FULL are here for templates instantiation.
template <> struct MapGetter<JoinKind::Left, JoinStrictness::Semi> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Inner, JoinStrictness::Semi> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Right, JoinStrictness::Semi> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Full, JoinStrictness::Semi> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
/// Only SEMI LEFT and SEMI RIGHT are valid. INNER and FULL are here for templates instantiation.
template <> struct MapGetter<JoinKind::Left, JoinStrictness::Anti> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Inner, JoinStrictness::Anti> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <> struct MapGetter<JoinKind::Right, JoinStrictness::Anti> { using Map = HashJoin::MapsAll; static constexpr bool flagged = true; };
template <> struct MapGetter<JoinKind::Full, JoinStrictness::Anti> { using Map = HashJoin::MapsOne; static constexpr bool flagged = false; };
template <JoinKind kind>
struct MapGetter<kind, JoinStrictness::Asof> { using Map = HashJoin::MapsAsof; static constexpr bool flagged = false; };
static constexpr std::array<JoinStrictness, 6> STRICTNESSES = {
JoinStrictness::RightAny,
JoinStrictness::Any,
JoinStrictness::All,
JoinStrictness::Asof,
JoinStrictness::Semi,
JoinStrictness::Anti,
};
static constexpr std::array<JoinKind, 4> KINDS = {
JoinKind::Left,
JoinKind::Inner,
JoinKind::Full,
JoinKind::Right
};
/// Init specified join map
inline bool joinDispatchInit(JoinKind kind, JoinStrictness strictness, HashJoin::MapsVariant & maps)
{
return static_for<0, KINDS.size() * STRICTNESSES.size()>([&](auto ij)
{
constexpr auto i = ij / STRICTNESSES.size();
constexpr auto j = ij % STRICTNESSES.size();
if (kind == KINDS[i] && strictness == STRICTNESSES[j])
{
maps = typename MapGetter<KINDS[i], STRICTNESSES[j]>::Map();
return true;
}
return false;
});
}
/// Call function on specified join map
template <typename MapsVariant, typename Func>
inline bool joinDispatch(JoinKind kind, JoinStrictness strictness, MapsVariant & maps, Func && func)
{
return static_for<0, KINDS.size() * STRICTNESSES.size()>([&](auto ij)
{
// NOTE: Avoid using nested static loop as GCC and CLANG have bugs in different ways
// See https://stackoverflow.com/questions/44386415/gcc-and-clang-disagree-about-c17-constexpr-lambda-captures
constexpr auto i = ij / STRICTNESSES.size();
constexpr auto j = ij % STRICTNESSES.size();
if (kind == KINDS[i] && strictness == STRICTNESSES[j])
{
func(
std::integral_constant<JoinKind, KINDS[i]>(),
std::integral_constant<JoinStrictness, STRICTNESSES[j]>(),
std::get<typename MapGetter<KINDS[i], STRICTNESSES[j]>::Map>(maps));
return true;
}
return false;
});
}
/// Call function on specified join map
template <typename MapsVariant, typename Func>
inline bool joinDispatch(JoinKind kind, JoinStrictness strictness, std::vector<const MapsVariant *> & mapsv, Func && func)
{
return static_for<0, KINDS.size() * STRICTNESSES.size()>([&](auto ij)
{
// NOTE: Avoid using nested static loop as GCC and CLANG have bugs in different ways
// See https://stackoverflow.com/questions/44386415/gcc-and-clang-disagree-about-c17-constexpr-lambda-captures
constexpr auto i = ij / STRICTNESSES.size();
constexpr auto j = ij % STRICTNESSES.size();
if (kind == KINDS[i] && strictness == STRICTNESSES[j])
{
using MapType = typename MapGetter<KINDS[i], STRICTNESSES[j]>::Map;
std::vector<const MapType *> v;
for (const auto & el : mapsv)
{
v.push_back(&std::get<MapType>(*el));
}
func(
std::integral_constant<JoinKind, KINDS[i]>(),
std::integral_constant<JoinStrictness, STRICTNESSES[j]>(),
v
/*std::get<typename MapGetter<KINDS[i], STRICTNESSES[j]>::Map>(maps)*/);
return true;
}
return false;
});
}
}
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