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src/sql/engine/basic/ob_values_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_values_op.h"
+#include "sql/engine/ob_exec_context.h"
+
+namespace oceanbase {
+namespace sql {
+using namespace common;
+
+ObValuesSpec::ObValuesSpec(ObIAllocator& alloc, const ObPhyOperatorType type) : ObOpSpec(alloc, type), row_store_(alloc)
+{}
+
+OB_SERIALIZE_MEMBER((ObValuesSpec, ObOpSpec), row_store_);
+
+ObValuesOp::ObValuesOp(ObExecContext& exec_ctx, const ObOpSpec& spec, ObOpInput* input)
+    : ObOperator(exec_ctx, spec, input)
+{}
+
+int ObValuesOp::inner_open()
+{
+  int ret = OB_SUCCESS;
+  row_store_it_ = MY_SPEC.row_store_.begin();
+  ObObj* cells = static_cast<ObObj*>(ctx_.get_allocator().alloc(sizeof(ObObj) * MY_SPEC.output_.count()));
+  if (OB_ISNULL(cells)) {
+    ret = OB_ALLOCATE_MEMORY_FAILED;
+    LOG_WARN("alloc memory failed", K(ret));
+  } else {
+    for (int64_t i = 0; i < MY_SPEC.output_.count(); i++) {
+      new (&cells[i]) ObObj();
+    }
+    cur_row_.cells_ = cells;
+    cur_row_.count_ = MY_SPEC.output_.count();
+  }
+  return ret;
+}
+
+int ObValuesOp::rescan()
+{
+  row_store_it_ = MY_SPEC.row_store_.begin();
+  return ObOperator::rescan();
+}
+
+int ObValuesOp::inner_get_next_row()
+{
+  int ret = OB_SUCCESS;
+  if (OB_FAIL(row_store_it_.get_next_row(cur_row_))) {
+    if (OB_ITER_END != ret) {
+      LOG_WARN("get row from row store failed", K(ret));
+    }
+  } else {
+    clear_evaluated_flag();
+    for (int64_t i = 0; OB_SUCC(ret) && i < MY_SPEC.output_.count(); i++) {
+      const ObObj& cell = cur_row_.cells_[i];
+      ObDatum& datum = MY_SPEC.output_.at(i)->locate_datum_for_write(eval_ctx_);
+      ObEvalInfo& eval_info = MY_SPEC.output_.at(i)->get_eval_info(eval_ctx_);
+      ObExpr* expr = MY_SPEC.output_.at(i);
+      if (cell.is_null()) {
+        datum.set_null();
+      } else if (cell.get_type() != expr->datum_meta_.type_) {
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("type mismatch", K(ret), K(i), K(cell.get_type()), K(*expr));
+      } else if (OB_FAIL(datum.from_obj(cell, expr->obj_datum_map_))) {
+        LOG_WARN("convert obj to datum failed", K(ret));
+      } else {
+        eval_info.evaluated_ = true;
+      }
+    }
+  }
+  return ret;
+}
+
+}  // end namespace sql
+}  // end namespace oceanbase