JNSimba commented on code in PR #20192: URL: https://github.com/apache/doris/pull/20192#discussion_r1210467913
########## samples/doris-demo/doris-source-demo/src/main/java/org/apache/doris/sdk/DorisReaderExample.java: ########## @@ -0,0 +1,186 @@ +// 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. +package org.apache.doris.sdk; + +import com.alibaba.fastjson.JSON; +import com.alibaba.fastjson.JSONObject; +import org.apache.arrow.memory.RootAllocator; +import org.apache.arrow.vector.FieldVector; +import org.apache.arrow.vector.VectorSchemaRoot; +import org.apache.arrow.vector.ipc.ArrowStreamReader; +import org.apache.commons.codec.binary.Base64; +import org.apache.doris.sdk.thrift.TDorisExternalService; +import org.apache.doris.sdk.thrift.TScanBatchResult; +import org.apache.doris.sdk.thrift.TScanCloseParams; +import org.apache.doris.sdk.thrift.TScanColumnDesc; +import org.apache.doris.sdk.thrift.TScanNextBatchParams; +import org.apache.doris.sdk.thrift.TScanOpenParams; +import org.apache.doris.sdk.thrift.TScanOpenResult; +import org.apache.http.HttpHeaders; +import org.apache.http.client.methods.CloseableHttpResponse; +import org.apache.http.client.methods.HttpPost; +import org.apache.http.entity.StringEntity; +import org.apache.http.impl.client.CloseableHttpClient; +import org.apache.http.impl.client.HttpClients; +import org.apache.http.util.EntityUtils; +import org.apache.thrift.TConfiguration; +import org.apache.thrift.protocol.TBinaryProtocol; +import org.apache.thrift.protocol.TProtocol; +import org.apache.thrift.transport.TSocket; +import org.apache.thrift.transport.TTransport; + +import java.io.ByteArrayInputStream; +import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +public class DorisReaderExample { + static String dorisUrl = "127.0.0.1:8030"; + static String user = "root"; + static String password = ""; + static String database = "test"; + static String table = "table_1"; + static String sql = "select * from test.table_1"; + + static List<List<Object>> result = new ArrayList<>(); + + public static void main(String[] args) throws Exception { + JSONObject queryPlan = getQueryPlan(); + readData(queryPlan); + System.out.println(result); + System.out.println(result.size()); + } + + private static JSONObject getQueryPlan() throws Exception { + try (CloseableHttpClient client = HttpClients.custom().build()) { + HttpPost put = new HttpPost(String.format("http://%s/api/%s/%s/_query_plan";, dorisUrl, database, table)); + put.setHeader(HttpHeaders.EXPECT, "100-continue"); + put.setHeader(HttpHeaders.AUTHORIZATION, "Basic " + new String(Base64.encodeBase64((user + ":" + password).getBytes(StandardCharsets.UTF_8)))); + + Map<String,String> params = new HashMap<>(); + params.put("sql",sql); + StringEntity entity = new StringEntity(JSON.toJSONString(params)); + put.setEntity(entity); + + try (CloseableHttpResponse response = client.execute(put)) { + if (response.getEntity() != null ) { + String loadResult = EntityUtils.toString(response.getEntity()); + JSONObject queryPlan = JSONObject.parseObject(loadResult); + return queryPlan; + } + } + } + return null; + } + + private static void readData(JSONObject queryRes) throws Exception { + JSONObject data = queryRes.getJSONObject("data"); + String queryPlan = data.getString("opaqued_query_plan"); + JSONObject partitions = data.getJSONObject("partitions"); + for(Map.Entry<String, Object> tablet : partitions.entrySet()){ + Long tabletId = Long.parseLong(tablet.getKey()); + JSONObject value = JSONObject.parseObject(JSON.toJSONString(tablet.getValue())); + //get first backend + String routingsBackend = value.getJSONArray("routings").getString(0); + String backendHost = routingsBackend.split(":")[0]; + String backendPort = routingsBackend.split(":")[1]; + + //connect backend + TBinaryProtocol.Factory factory = new TBinaryProtocol.Factory(); + TTransport transport = new TSocket(new TConfiguration(), backendHost, Integer.parseInt(backendPort)); + TProtocol protocol = factory.getProtocol(transport); + TDorisExternalService.Client client = new TDorisExternalService.Client(protocol); + if (!transport.isOpen()) { + transport.open(); + } + + //build params + TScanOpenParams params = new TScanOpenParams(); + params.cluster = "default_cluster"; + params.database = database; + params.table = table; + params.tablet_ids = Arrays.asList(tabletId); + params.opaqued_query_plan = queryPlan; + // max row number of one read batch + params.setBatchSize(1024); + params.setQueryTimeout(3600); + params.setMemLimit(2147483648L); + params.setUser(user); + params.setPasswd(password); + + int offset =0; + //open scanner + TScanOpenResult tScanOpenResult = client.openScanner(params); + List<TScanColumnDesc> selectedColumns = tScanOpenResult.getSelectedColumns(); + + TScanNextBatchParams nextBatchParams = new TScanNextBatchParams(); + nextBatchParams.setContextId(tScanOpenResult.getContextId()); + boolean eos = false; + //connect + while(!eos){ + nextBatchParams.setOffset(offset); + TScanBatchResult next = client.getNext(nextBatchParams); + eos = next.isEos(); + if(!eos){ + int i = convertArrow(next, selectedColumns); + offset += i; + } + } + + //close + TScanCloseParams closeParams = new TScanCloseParams(); + closeParams.setContextId(tScanOpenResult.getContextId()); + client.closeScanner(closeParams); + if ((transport != null) && transport.isOpen()) { + transport.close(); + } + //System.out.println(String.format("read tablet %s from backend %s finished", tabletId, routingsBackend)); + } + } + + private static int convertArrow(TScanBatchResult nextResult, List<TScanColumnDesc> selectedColumns) throws Exception { + int offset = 0; Review Comment: The offset here is at the level of a single tablet, and the result is the data of all tablets -- This is an automated message from the Apache Git Service. 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