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src/share/ob_virtual_table_projector.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 COMMON
+#include "share/ob_virtual_table_projector.h"
+#include "share/schema/ob_multi_version_schema_service.h"
+namespace oceanbase {
+namespace common {
+int ObVirtualTableProjector::project_row(const ObIArray<Column>& columns, ObNewRow& row, const bool full_columns)
+{
+  int ret = OB_SUCCESS;
+  if (columns.count() <= 0) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("columns is empty", K(ret));
+  } else if (NULL == row.cells_) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("row.cells is null", K(ret));
+  } else {
+    int64_t cell_idx = 0;
+    FOREACH_CNT_X(column_id, output_column_ids_, OB_SUCCESS == ret)
+    {
+      bool find = false;
+      ObObj column_value;
+      FOREACH_CNT_X(column, columns, !find)
+      {
+        if (*column_id == column->column_id_) {
+          column_value = column->column_value_;
+          find = true;
+        }
+      }
+      if (!find && full_columns) {
+        ret = OB_ENTRY_NOT_EXIST;
+        LOG_WARN("column not exist", "column_id", *column_id, K(ret));
+      } else {
+        row.cells_[cell_idx] = column_value;
+        ++cell_idx;
+      }
+    }
+  }
+  return ret;
+}
+
+int ObVirtualTableProjector::check_column_exist(
+    const share::schema::ObTableSchema* table, const char* column_name, bool& exist) const
+{
+  int ret = OB_SUCCESS;
+  const share::schema::ObColumnSchemaV2* column_schema = NULL;
+  exist = false;
+  if (OB_ISNULL(table) || OB_ISNULL(column_name)) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid argument", KR(ret), K(table), K(column_name));
+  } else if (OB_ISNULL(column_schema = table->get_column_schema(column_name))) {
+    ret = OB_SCHEMA_ERROR;
+    LOG_WARN("fail to get column schema", KR(ret), K(column_name));
+  } else {
+    uint64_t table_column_id = column_schema->get_column_id();
+    FOREACH_CNT_X(column_id, output_column_ids_, OB_SUCCESS == ret)
+    {
+      if (*column_id == table_column_id) {
+        exist = true;
+        break;
+      }
+    }
+  }
+  return ret;
+}
+////////////////////////////////////////////////////////////////
+ObSimpleVirtualTableIterator::ObSimpleVirtualTableIterator(uint64_t tenant_id, uint64_t table_id)
+    : tenant_id_(tenant_id), table_id_(table_id), schema_service_(NULL), table_schema_(NULL)
+{}
+
+int ObSimpleVirtualTableIterator::init(share::schema::ObMultiVersionSchemaService* schema_service)
+{
+  int ret = OB_SUCCESS;
+  if (schema_service_ != NULL) {
+    ret = OB_INIT_TWICE;
+    LOG_WARN("schema_service_ not NULL", K(ret));
+  } else if (NULL == schema_service) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("schema_service is NULL", K(ret));
+  } else {
+    schema_service_ = schema_service;
+  }
+  return ret;
+}
+
+int ObSimpleVirtualTableIterator::inner_open()
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(NULL == schema_service_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("schema_service_ not init", K(ret));
+  } else if (OB_FAIL(schema_service_->get_tenant_schema_guard(tenant_id_, schema_guard_))) {
+    LOG_WARN("fail to get schema guard", K(ret));
+  } else if (OB_FAIL(get_table_schema(tenant_id_, table_id_))) {
+    LOG_WARN("fail to get table schema", K(ret));
+  } else if (OB_FAIL(init_all_data())) {
+    LOG_WARN("fail to init all data", K(ret));
+  }
+  return ret;
+}
+
+int ObSimpleVirtualTableIterator::get_table_schema(uint64_t tenant_id, uint64_t table_id)
+{
+  int ret = OB_SUCCESS;
+  const uint64_t my_table_id = combine_id(tenant_id, table_id);
+  if (OB_FAIL(schema_guard_.get_table_schema(my_table_id, table_schema_))) {
+    LOG_WARN("fail to get table schema", K(tenant_id), K(table_id), K(my_table_id), K(ret));
+  } else if (NULL == table_schema_) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("table schema is null", K(ret), K(tenant_id), K(table_id));
+  } else {
+  }  // no more to do
+  return ret;
+}
+
+int ObSimpleVirtualTableIterator::inner_get_next_row(common::ObNewRow*& row)
+{
+  int ret = OB_SUCCESS;
+  columns_.reuse();
+  if (OB_FAIL(get_next_full_row(table_schema_, columns_))) {
+    if (OB_ITER_END != ret) {
+      LOG_WARN("fail to get full row", K(ret));
+    }
+  } else if (OB_FAIL(project_row(columns_, cur_row_))) {
+    LOG_WARN("fail to project row", K(columns_), K(ret));
+  } else {
+    row = &cur_row_;
+  }
+  return ret;
+}
+
+}  // end namespace common
+}  // end namespace oceanbase