// Copyright 2019 Google LLC.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

syntax = "proto3";

package google.cloud.automl.v1beta1;

import "google/cloud/automl/v1beta1/data_stats.proto";
import "google/cloud/automl/v1beta1/data_types.proto";
import "google/api/annotations.proto";

option go_package = "google.golang.org/genproto/googleapis/cloud/automl/v1beta1;automl";
option java_multiple_files = true;
option java_package = "com.google.cloud.automl.v1beta1";
option php_namespace = "Google\\Cloud\\AutoMl\\V1beta1";
option ruby_package = "Google::Cloud::AutoML::V1beta1";

// A representation of a column in a relational table. When listing them, column specs are returned in the same order in which they were
// given on import .
// Used by:
//   *   Tables
message ColumnSpec {
  // Identifies the table's column, and its correlation with the column this
  // ColumnSpec describes.
  message CorrelatedColumn {
    // The column_spec_id of the correlated column, which belongs to the same
    // table as the in-context column.
    string column_spec_id = 1;

    // Correlation between this and the in-context column.
    CorrelationStats correlation_stats = 2;
  }

  // Output only. The resource name of the column specs.
  // Form:
  //
  // `projects/{project_id}/locations/{location_id}/datasets/{dataset_id}/tableSpecs/{table_spec_id}/columnSpecs/{column_spec_id}`
  string name = 1;

  // The data type of elements stored in the column.
  DataType data_type = 2;

  // Output only. The name of the column to show in the interface. The name can
  // be up to 100 characters long and can consist only of ASCII Latin letters
  // A-Z and a-z, ASCII digits 0-9, underscores(_), and forward slashes(/), and
  // must start with a letter or a digit.
  string display_name = 3;

  // Output only. Stats of the series of values in the column.
  // This field may be stale, see the ancestor's
  // Dataset.tables_dataset_metadata.stats_update_time field
  // for the timestamp at which these stats were last updated.
  DataStats data_stats = 4;

  // Deprecated.
  repeated CorrelatedColumn top_correlated_columns = 5;

  // Used to perform consistent read-modify-write updates. If not set, a blind
  // "overwrite" update happens.
  string etag = 6;
}
