secondary_engine_costing_flags.h

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#ifndef SQL_JOIN_OPTIMIZER_SECONDARY_ENGINE_COSTING_FLAGS_H_
#define SQL_JOIN_OPTIMIZER_SECONDARY_ENGINE_COSTING_FLAGS_H_
 
#include <cstdint>
 
/**
  @file
 
  For updating an AccessPath's costs by a secondary engine, i.e. costing
  a partial plan, the secondary engine may need to know ahead of time
  certain information about the current planning, for which we provide
  some flags here.
 
 */
 
using SecondaryEngineCostingFlags = uint64_t;
 
enum class SecondaryEngineCostingFlag : SecondaryEngineCostingFlags {
  HAS_MULTIPLE_BASE_TABLES,
  CONTAINS_AGGREGATION_ACCESSPATH,
  CONTAINS_WINDOW_ACCESSPATH,
  HANDLING_DISTINCT_ORDERBY_LIMITOFFSET
};
 
/// Creates an empty bitmap of costing flags. This is the base
/// case for the function template with the same name below.
constexpr inline SecondaryEngineCostingFlags MakeSecondaryEngineCostingFlags() {
  return 0;
}
 
/// Creates a bitmap representing a set of costing flags.
template <typename... Args>
constexpr inline SecondaryEngineCostingFlags MakeSecondaryEngineCostingFlags(
    const SecondaryEngineCostingFlag &flag1, const Args &... rest) {
  return (uint64_t{1} << static_cast<SecondaryEngineCostingFlags>(flag1)) |
         MakeSecondaryEngineCostingFlags(rest...);
}
 
constexpr inline SecondaryEngineCostingFlags operator|(
    const SecondaryEngineCostingFlags &a, const SecondaryEngineCostingFlag &b) {
  return a | MakeSecondaryEngineCostingFlags(b);
}
 
constexpr inline SecondaryEngineCostingFlags operator|(
    const SecondaryEngineCostingFlag &a, const SecondaryEngineCostingFlags &b) {
  return MakeSecondaryEngineCostingFlags(a) | b;
}
 
constexpr inline SecondaryEngineCostingFlags &operator|=(
    SecondaryEngineCostingFlags &a, const SecondaryEngineCostingFlag &b) {
  return a |= MakeSecondaryEngineCostingFlags(b);
}
 
constexpr inline SecondaryEngineCostingFlags operator&(
    const SecondaryEngineCostingFlags &a, const SecondaryEngineCostingFlag &b) {
  return a & MakeSecondaryEngineCostingFlags(b);
}
 
constexpr inline SecondaryEngineCostingFlags operator&(
    const SecondaryEngineCostingFlag &a, const SecondaryEngineCostingFlags &b) {
  return MakeSecondaryEngineCostingFlags(a) & b;
}
 
constexpr inline SecondaryEngineCostingFlags &operator&=(
    SecondaryEngineCostingFlags &a, const SecondaryEngineCostingFlag &b) {
  return a &= MakeSecondaryEngineCostingFlags(b);
}
 
constexpr inline SecondaryEngineCostingFlags operator~(
    const SecondaryEngineCostingFlag &flag) {
  return ~MakeSecondaryEngineCostingFlags(flag);
}
 
#endif /* SQL_JOIN_OPTIMIZER_SECONDARY_ENGINE_COSTING_FLAGS_H_ */