join_type.h

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#ifndef SQL_JOIN_TYPE_H
#define SQL_JOIN_TYPE_H
 
/* Copyright (c) 2020, 2024, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
// Used to describe what kind of join an iterator is executing.
enum class JoinType {
  INNER,
  /// Left outer join.
  OUTER,
 
  /// Left antijoin, i.e.:
  /// SELECT projection FROM left_releation WHERE NOT EXISTS
  /// (SELECT 1 FROM right_releation WHERE predicate)
  ANTI,
 
  /// Left semijoin, i.e.:
  /// SELECT projection FROM left_releation WHERE EXISTS
  /// (SELECT 1 FROM right_releation WHERE predicate)
  SEMI,
  FULL_OUTER
};
 
#endif  // SQL_JOIN_TYPE_H