// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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="proto2";

package impala;

import "common.proto";
import "row_batch.proto";

import "kudu/rpc/rpc_header.proto";

// All fields are required in V1.
message TransmitDataRequestPB {
  // The fragment instance id of the receiver.
  optional UniqueIdPB dest_fragment_instance_id = 1;

  // Sender instance id, unique within a fragment.
  optional int32 sender_id = 2;

  // PlanNodeId of the exchange node which owns the receiver.
  optional int32 dest_node_id = 3;

  // The header which contains the meta-data of the row batch.
  optional RowBatchHeaderPB row_batch_header = 4;

  // The sidecar index of tuple offsets' buffer which is an array of int32 containing the
  // offsets of tuples into the buffer pointed to by tuple data's sidecar below. There are
  // num_rows * num_tuples_per_row offsets in total. An offset of -1 records a NULL.
  optional int32 tuple_offsets_sidecar_idx = 5;

  // The sidecar index of the tuple's data which is a (compressed) row batch.
  // The details of the row batch (e.g. # of rows) is in 'row_batch_header' above.
  optional int32 tuple_data_sidecar_idx = 6;
}

// All fields are required in V1.
message TransmitDataResponsePB {
  // Status::OK() on success; Error status on failure.
  optional StatusPB status = 1;

  // Latency for response in the receiving daemon in nanoseconds.
  optional int64 receiver_latency_ns = 2;
}

// All fields are required in V1.
message EndDataStreamRequestPB {
  // The fragment instance id of the receiver.
  optional UniqueIdPB dest_fragment_instance_id = 1;

  // Sender instance id, unique within a fragment.
  optional int32 sender_id = 2;

  // PlanNodeId of the exchange node which owns the receiver.
  optional int32 dest_node_id = 3;
}

// All fields are required in V1.
message EndDataStreamResponsePB {
  optional StatusPB status = 1;

  // Latency for response in the receiving daemon in nanoseconds.
  optional int64 receiver_latency_ns = 2;
}

message BloomFilterPB {
  // Log_2 of the bufferpool space required for this filter.
  // See BloomFilter::BloomFilter() for details.
  optional int32 log_bufferpool_space = 1;

  // If always_true or always_false is true, 'directory' and 'log_bufferpool_space' are
  // not meaningful.
  optional bool always_true = 2;
  optional bool always_false = 3;

  // The sidecar index associated with the directory of a Bloom filter.
  // A directory is a list of buckets representing the Bloom Filter contents,
  // laid out contiguously in one string for efficiency of (de)serialisation.
  // See BloomFilter::Bucket and BloomFilter::directory_.
  optional int32 directory_sidecar_idx = 4;
}

message MinMaxFilterPB {
  // If true, filter allows all elements to pass and 'min'/'max' will not be set.
  optional bool always_true = 1;

  // If true, filter doesn't allow any elements to pass and 'min'/'max' will not be set.
  optional bool always_false = 2;

  optional ColumnValuePB min = 3;
  optional ColumnValuePB max = 4;
}

message UpdateFilterParamsPB {
  // Filter ID, unique within a query.
  optional int32 filter_id = 1;

  // Query that this filter is for.
  optional UniqueIdPB query_id = 2;

  optional BloomFilterPB bloom_filter = 3;

  optional MinMaxFilterPB min_max_filter = 4;
}

message UpdateFilterResultPB {
  optional StatusPB status = 1;

  // Latency for response in the receiving daemon in nanoseconds.
  optional int64 receiver_latency_ns = 2;
}

message PublishFilterParamsPB {
  // Filter ID, unique within a query.
  optional int32 filter_id = 1;

  // Query that this filter is for.
  optional UniqueIdPB dst_query_id = 2;

  // Index of fragment to receive this filter
  optional int32 dst_fragment_idx = 3;

  // Actual bloom_filter payload
  optional BloomFilterPB bloom_filter = 4;

  // Actual min_max_filter payload
  optional MinMaxFilterPB min_max_filter = 5;
}

message PublishFilterResultPB {
  optional StatusPB status = 1;

  // Latency for response in the receiving daemon in nanoseconds.
  optional int64 receiver_latency_ns = 2;
}

// Handles data transmission between fragment instances.
service DataStreamService {
  // Override the default authorization method.
  option (kudu.rpc.default_authz_method) = "Authorize";

  // Called by sender to transmit a single row batch. Returns error indication
  // if params.fragmentId or params.destNodeId are unknown or if data couldn't
  // be read.
  rpc TransmitData(TransmitDataRequestPB) returns (TransmitDataResponsePB);

  // Called by a sender to close the channel between fragment instances.
  rpc EndDataStream(EndDataStreamRequestPB) returns (EndDataStreamResponsePB);

  // Called by fragment instances that produce local runtime filters to deliver them to
  // the coordinator for aggregation and broadcast.
  rpc UpdateFilter(UpdateFilterParamsPB) returns (UpdateFilterResultPB);

  // Called by the coordinator to deliver global runtime filters to fragments for
  // application at plan nodes.
  rpc PublishFilter(PublishFilterParamsPB) returns (PublishFilterResultPB);
}