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