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src/sql/engine/subquery/ob_subplan_scan_op.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 "ob_subplan_scan_op.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObSubPlanScanSpec::ObSubPlanScanSpec(ObIAllocator& alloc, const ObPhyOperatorType type)
+    : ObOpSpec(alloc, type), projector_(alloc)
+{}
+
+OB_SERIALIZE_MEMBER((ObSubPlanScanSpec, ObOpSpec), projector_);
+
+ObSubPlanScanOp::ObSubPlanScanOp(ObExecContext& exec_ctx, const ObOpSpec& spec, ObOpInput* input)
+    : ObOperator(exec_ctx, spec, input)
+{}
+
+int ObSubPlanScanOp::inner_open()
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(child_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("no child", K(ret));
+  } else if (OB_UNLIKELY(MY_SPEC.projector_.count() % 2 != 0)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("projector array size should be multiples of 2", K(ret));
+  }
+  return ret;
+}
+
+int ObSubPlanScanOp::rescan()
+{
+  return ObOperator::rescan();
+}
+
+int ObSubPlanScanOp::inner_get_next_row()
+{
+  int ret = OB_SUCCESS;
+  clear_evaluated_flag();
+  if (OB_FAIL(child_->get_next_row())) {
+    if (OB_ITER_END != ret) {
+      LOG_WARN("get row from child failed", K(ret));
+    }
+  } else {
+    for (int64_t i = 0; OB_SUCC(ret) && i < MY_SPEC.projector_.count(); i += 2) {
+      ObExpr* from = MY_SPEC.projector_[i];
+      ObExpr* to = MY_SPEC.projector_[i + 1];
+      ObDatum* datum = NULL;
+      if (OB_FAIL(from->eval(eval_ctx_, datum))) {
+        LOG_WARN("expr evaluate failed", K(ret), K(*from));
+      } else {
+        to->locate_expr_datum(eval_ctx_) = *datum;
+        to->get_eval_info(eval_ctx_).evaluated_ = true;
+      }
+    }
+  }
+  return ret;
+}
+
+}  // end namespace sql
+}  // end namespace oceanbase