我尝试使用Apache Drill 1.3.0 在数字字段上获取汇总值，而不在文件系统上安装 Hadoop和Apache Drill。
现在问题是 - 我想在阅读CSV文件时省略标题，但我找不到任何选项来告诉Apache Drill，请skipFirstLine使用java程序，因为我还没有已安装Apache Drill。
由于列名称，程序因错误而终止并抛出NumberFormatException。
的pom.xml
<dependency>
<groupId>org.apache.drill.exec</groupId>
<artifactId>drill-jdbc</artifactId>
<version>1.3.0</version>
</dependency>
示例CSV文件：
＆＃34; ffe92de2-e633-4741-BC4B-83e91dce665a.csv＆＃34;
"A"
"100"
示例Java程序：
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/*
* Created By: Ashish Pancholi
* On: 16-12-2015
* */
public class DrillExample {
private static final String DRILL_JDBC_LOCAL_URI = "jdbc:drill:zk=local";
private Connection con = null;
public DrillExample() throws SQLException {
con = new org.apache.drill.jdbc.Driver().connect(DRILL_JDBC_LOCAL_URI, getDefaultProperties());
}
public int getArchiveNumFieldSUM(String filepath) throws Exception {
//query to be executed
String query = "select sum(cast(columns[0] as int)) from dfs.`"+filepath+"`";
try {
// creating statement
Statement stmt = con.createStatement();
// executing query
ResultSet rs = stmt.executeQuery(query);
// get the number of rows from the result set
rs.next();
return rs.getInt(1);
} catch (Exception ex) {
throw ex;
}
}
private Properties getDefaultProperties() {
final Properties properties = new Properties();
properties.setProperty(org.apache.drill.exec.ExecConstants.HTTP_ENABLE, "false");
return properties;
}
public void shutdownApacheDrill(){
if (con != null) {
try {
con.close();
} catch (SQLException e) {
//ignore
}
}
}
public static void main(String[] arg){
try {
int count = 0;
DrillExample local = new DrillExample();
String filePath = "C:/Workarea/Project/xyz/Structured Data/ffe92de2-e633-4741-bc4b-83e91dce665a.csv";
try {
count = local.getArchiveNumFieldSUM(filePath);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(count);
}catch(Exception ex){
ex.printStackTrace();
}
}
}
我收到以下错误：
SYSTEM ERROR: NumberFormatException: A
Fragment 0:0
[Error Id: 72dec3db-8f28-462d-838d-dcb60663e389 on ashish:31010].
java.sql.SQLException: SYSTEM ERROR: NumberFormatException: A
Fragment 0:0
[Error Id: 72dec3db-8f28-462d-838d-dcb60663e389 on ashish:31010]
at org.apache.drill.jdbc.impl.DrillCursor.nextRowInternally(DrillCursor.java:247)
at org.apache.drill.jdbc.impl.DrillCursor.loadInitialSchema(DrillCursor.java:290)
at org.apache.drill.jdbc.impl.DrillResultSetImpl.execute(DrillResultSetImpl.java:1359)
at org.apache.drill.jdbc.impl.DrillResultSetImpl.execute(DrillResultSetImpl.java:74)
at net.hydromatic.avatica.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:404)
at net.hydromatic.avatica.AvaticaStatement.executeQueryInternal(AvaticaStatement.java:351)
at net.hydromatic.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:78)
at org.apache.drill.jdbc.impl.DrillStatementImpl.executeQuery(DrillStatementImpl.java:97)
at org.openskye.core.structured.DrillExample.getArchiveNumFieldSUM(DrillExample.java:30)
at org.openskye.core.structured.DrillExample.main(DrillExample.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:130)
Caused by: org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: NumberFormatException: A
Fragment 0:0
[Error Id: 72dec3db-8f28-462d-838d-dcb60663e389 on ashish:31010]
at org.apache.drill.exec.rpc.user.QueryResultHandler.resultArrived(QueryResultHandler.java:118)
at org.apache.drill.exec.rpc.user.UserClient.handleReponse(UserClient.java:112)
at org.apache.drill.exec.rpc.BasicClientWithConnection.handle(BasicClientWithConnection.java:47)
at org.apache.drill.exec.rpc.BasicClientWithConnection.handle(BasicClientWithConnection.java:32)
at org.apache.drill.exec.rpc.RpcBus.handle(RpcBus.java:69)
at org.apache.drill.exec.rpc.RpcBus$RequestEvent.run(RpcBus.java:400)
at org.apache.drill.common.SerializedExecutor$RunnableProcessor.run(SerializedExecutor.java:105)
at org.apache.drill.exec.rpc.RpcBus$SameExecutor.execute(RpcBus.java:264)
at org.apache.drill.common.SerializedExecutor.execute(SerializedExecutor.java:142)
at org.apache.drill.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:298)
at org.apache.drill.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:269)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
20:07:26.097 [USER-rpc-event-queue] INFO o.a.d.j.i.DrillResultSetImpl$ResultsListener - [#1] Query failed:
org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: NumberFormatException: A
Fragment 0:0
[Error Id: 72dec3db-8f28-462d-838d-dcb60663e389 on ashish:31010]
at org.apache.drill.exec.rpc.user.QueryResultHandler.resultArrived(QueryResultHandler.java:118) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.user.UserClient.handleReponse(UserClient.java:112) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.BasicClientWithConnection.handle(BasicClientWithConnection.java:47) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.BasicClientWithConnection.handle(BasicClientWithConnection.java:32) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.RpcBus.handle(RpcBus.java:69) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.RpcBus$RequestEvent.run(RpcBus.java:400) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.common.SerializedExecutor$RunnableProcessor.run(SerializedExecutor.java:105) [drill-common-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.RpcBus$SameExecutor.execute(RpcBus.java:264) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.common.SerializedExecutor.execute(SerializedExecutor.java:142) [drill-common-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:298) [drill-java-exec-1.3.0.jar:1.3.0]
at org.apache.drill.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:269) [drill-java-exec-1.3.0.jar:1.3.0]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89) [netty-codec-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:254) [netty-handler-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-codec-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242) [netty-codec-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [netty-transport-4.0.27.Final.jar:4.0.27.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111) [netty-common-4.0.27.Final.jar:4.0.27.Final]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:254)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at java.lang.Thread.run(Thread.java:744)
20:07:26.105 [USER-rpc-event-queue] DEBUG o.a.drill.exec.rpc.user.UserClient - Sending response with Sender 1145498900
0
更新
我找到了一个设置SkipFirstLine属性的类，但是我无法理解我必须通过它的位置？
TextParsingSettings textParsingSettings = new TextParsingSettings();
textParsingSettings.setSkipFirstLine(true);