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src/sql/engine/expr/ob_expr_subquery_not_equal.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include "sql/engine/expr/ob_expr_subquery_not_equal.h"
+#include "common/row/ob_row.h"
+#include "common/object/ob_obj_compare.h"
+#include "sql/engine/expr/ob_expr_not_equal.h"
+#include "sql/engine/expr/ob_expr_result_type_util.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObExprSubQueryNotEqual::ObExprSubQueryNotEqual(ObIAllocator& alloc)
+    : ObSubQueryRelationalExpr(alloc, T_OP_SQ_NE, N_SQ_NOT_EQUAL, 2, NOT_ROW_DIMENSION)
+{}
+
+ObExprSubQueryNotEqual::~ObExprSubQueryNotEqual()
+{}
+
+int ObExprSubQueryNotEqual::compare_single_row(
+    const ObNewRow& left_row, const ObNewRow& right_row, ObExprCtx& expr_ctx, ObObj& result) const
+{
+  int ret = OB_SUCCESS;
+  bool cnt_null = false;
+  if (OB_UNLIKELY(left_row.get_count() != right_row.get_count())) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("right and left row is not equal", K(ret));
+  } else {
+    const ObIArray<ObExprCalcType>& cmp_types = result_type_.get_row_calc_cmp_types();
+    EXPR_DEFINE_CMP_CTX(result_type_.get_calc_meta(), false, expr_ctx);
+    EXPR_DEFINE_CAST_CTX(expr_ctx, CM_WARN_ON_FAIL);
+    for (int64_t i = 0; OB_SUCC(ret) && i < left_row.get_count(); ++i) {
+      const ObObj& left_param = left_row.get_cell(i);
+      const ObObj& right_param = right_row.get_cell(i);
+      cmp_ctx.cmp_type_ = cmp_types.at(i).get_type();
+      cmp_ctx.cmp_cs_type_ = cmp_types.at(i).get_collation_type();
+      if (OB_FAIL(ObExprNotEqual::calc(result, left_param, right_param, cmp_ctx, cast_ctx))) {
+        LOG_WARN("Compare expression failed", K(ret));
+      } else if (result.is_true()) {
+        break;
+      } else if (result.is_null()) {
+        cnt_null = true;
+      }
+    }
+    if (OB_SUCC(ret) && cnt_null && result.is_false()) {
+      result.set_null();
+    }
+  }
+
+  return ret;
+}
+}  // namespace sql
+}  // namespace oceanbase