Netezza Java UDTF 自定义函数
Posted
技术标签:
【中文标题】Netezza Java UDTF 自定义函数【英文标题】：Netezza Java UDTF custom function 【发布时间】：2013-03-29 16:57:11 【问题描述】：您好，我是 Netezza 的新手，我被要求开发自定义 Java 函数并提交 API。
我的问题是我是否可以根据给定的要求生成解决方案。这是要求。
给了我一张桌子，我们把它命名为 Table1。我必须逐行读取表格并计算不同的值，当我的值有意义时，我必须将其插入到不同的表格中。
我只需要读取多行，计算多个值，当数据有意义时，我可以输出它。
所以我的问题是，这是否可以在 Netezza 自定义 Java UDTF 函数中读取多行并且输出很少？
【问题讨论】：
【参考方案1】：是的，可以读取n行并输出
没有人帮助我，我继续构建了这个函数，它工作正常。
3 年后，我被要求分享解决方案。现在不记得要求了，我也是很久以前离开公司的。所以我正在粘贴我编写的 600 行代码，当时我很天真，可能有更好的方法来做到这一点。如果你能理解它，你会很幸运。
import java.sql.Timestamp;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import org.netezza.ae.Nzae;
import org.netezza.ae.NzaeApi;
import org.netezza.ae.NzaeApiGenerator;
import org.netezza.ae.NzaeDataTypes;
import org.netezza.ae.NzaeException;
import org.netezza.ae.NzaeMetadata;
import org.netezza.ae.NzaeRecord;
import org.netezza.ae.NzaeUtil;
public class viewResolver
private static final Executor exec = Executors.newCachedThreadPool();
public static final void main(String[] args)
try
mainImpl(args);
catch (Throwable t)
System.err.println(t.toString());
NzaeUtil.logException(t, "main");
public static final void mainImpl(String[] args)
NzaeApiGenerator helper = new NzaeApiGenerator();
while (true)
final NzaeApi api = helper.getApi(NzaeApi.FUNCTION);
if (api.apiType == NzaeApi.FUNCTION)
if (!helper.isRemote())
run(api.aeFunction);
break;
else
Runnable task = new Runnable()
public void run()
try
viewResolver.run(api.aeFunction);
finally
api.aeFunction.close();
;
exec.execute(task);
helper.close();
public static int run(Nzae ae)
try
int ret = runReal(ae);
ae.done();
return ret;
catch (NzaeException ex)
ex.printStackTrace();
ae.userError(ex.getMessage());
ae.done();
throw ex;
catch (Throwable ex)
ex.printStackTrace();
ae.userError(ex.toString());
ae.done();
throw new NzaeException(ex.toString());
static String acc_id = null;
static String rec_id = null;
static String tuner = null;
static String channel = null;
static String show_name = null;
static String tmsId = null;
static String viewing_type = null;
static String event_type = null;
static String channelFamily = null;
static String ruid = null;
static int suid = 0;
static double timeStarted = 0;
static double timeEnded = 0;
static Timestamp datecreated = null;
static double content_start = 0;
static double content_end = 0;
static String prev_acc_id = null;
static String prev_rec_id = null;
static String prev_tuner = null;
static String prev_channel = null;
static String prev_show_name = null;
static String prev_tmsId = null;
static String prev_viewing_type = null;
static String prev_event_type = null;
static String prev_channelFamily = null;
static String prev_ruid = null;
static int prev_suid = 0;
static double prev_timeStarted = 0;
static double prev_timeEnded = 0;
static Timestamp prev_datecreated = null;
static double prev_content_start = 0;
static double prev_content_end = 0;
public static int runReal(Nzae ae)
double dvr_time_watched = 0;
double vod_time_watched = 0;
double manual_ffx = 0;
double manual_ffr = 0;
boolean end = false;
double tune_duration = 0;
boolean live_DVR_Flag = false;
final NzaeMetadata meta = ae.getMetadata();
NzaeRecord input = null;
boolean firstRecord = true;
validateInput(meta);
while (!end)
NzaeRecord output = ae.createOutputRecord();
if (true)
input = ae.next();
if (input == null) // checks if no more records
end = true;
// returns the final view
if (prev_timeEnded - prev_timeStarted != 0) // if final view is tune
tune_duration = prev_timeEnded - prev_timeStarted;
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel, prev_show_name,
prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily, prev_ruid,
prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated, 0, 0, tune_duration,
manual_ffx, manual_ffr);
ae.outputResult(output);
if (vod_time_watched != 0 || dvr_time_watched != 0 || manual_ffr != 0 || manual_ffx != 0)
if (!prev_event_type.equalsIgnoreCase("DVR_EOE") && dvr_time_watched != 0) // if DVR
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, dvr_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
else if (!prev_event_type.equalsIgnoreCase("DVR_EOE") && vod_time_watched != 0) // if VOD
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, vod_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
continue;
else // set variables
if (input.getField(0) != null)
acc_id = input.getField(0).toString();
else
acc_id = null;
if (input.getField(1) != null)
rec_id = input.getField(1).toString();
else
rec_id = null;
if (input.getField(2) != null)
tuner = input.getField(2).toString();
else
tuner = null;
if (input.getField(3) != null)
channel = input.getField(3).toString();
else
channel = null;
if (input.getField(4) != null)
show_name = input.getField(4).toString();
else
show_name = null;
if (input.getField(5) != null)
tmsId = input.getField(5).toString();
else
tmsId = null;
if (input.getField(6) != null)
viewing_type = input.getField(6).toString();
else
viewing_type = null;
if (input.getField(7) != null)
event_type = input.getField(7).toString();
else
event_type = null;
if (input.getField(8) != null)
channelFamily = input.getField(8).toString();
else
channelFamily = null;
if (input.getField(9) != null)
ruid = input.getField(9).toString();
else
ruid = null;
if (input.getField(10) != null)
suid = input.getFieldAsNumber(10).intValue();
else
suid = 0;
if (input.getField(11) != null)
timeStarted = input.getFieldAsNumber(11).doubleValue();
else
timeStarted = 0;
if (input.getField(12) != null)
timeEnded = input.getFieldAsNumber(12).doubleValue();
else
timeEnded = 0;
if (input.getField(13) != null)
datecreated = input.getFieldAsTimestamp(13);
else
datecreated = null;
if (input.getField(14) != null)
content_start = input.getFieldAsNumber(14).doubleValue();
else
content_start = 0;
if (input.getField(15) != null)
content_end = input.getFieldAsNumber(15).doubleValue();
else
content_end = 0;
if (firstRecord)
prev_acc_id = acc_id;
prev_rec_id = rec_id;
prev_tuner = tuner;
prev_channel = channel;
prev_show_name = show_name;
prev_tmsId = tmsId;
prev_viewing_type = viewing_type;
prev_event_type = event_type;
prev_channelFamily = channelFamily;
prev_ruid = ruid;
prev_suid = suid;
prev_timeStarted = timeStarted;
prev_timeEnded = timeEnded;
prev_datecreated = datecreated;
prev_content_start = content_start;
prev_content_end = content_end;
firstRecord = false;
// ********* if acc id or rec id changes
if (prev_acc_id != null && prev_rec_id != null && prev_acc_id != null && prev_rec_id != null)
if (!prev_acc_id.equalsIgnoreCase(acc_id) || !prev_rec_id.equalsIgnoreCase(rec_id))
if (prev_timeEnded - prev_timeStarted != 0) // if tune
tune_duration = prev_timeEnded - prev_timeStarted;
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel, prev_show_name,
prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily, prev_ruid,
prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated, 0, 0, tune_duration,
manual_ffx, manual_ffr);
ae.outputResult(output);
prev_timeEnded = prev_timeStarted = 0;
setPreviousValues();
tune_duration = 0;
manual_ffr = 0;
manual_ffx = 0;
if (dvr_time_watched != 0 || manual_ffr != 0 || manual_ffx != 0)
if (!prev_event_type.equalsIgnoreCase("DVR_EOE")) // if DVR
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, dvr_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
dvr_time_watched = 0;
manual_ffr = 0;
manual_ffx = 0;
setPreviousValues();
live_DVR_Flag = false;
if (vod_time_watched != 0 || manual_ffr != 0 || manual_ffx != 0)
if (!prev_event_type.equalsIgnoreCase("DVR_EOE")) // if VOD
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, vod_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
vod_time_watched = 0;
manual_ffr = 0;
manual_ffx = 0;
setPreviousValues();
live_DVR_Flag = false;
// ******** special case tune to DVR
if (viewing_type != null && prev_viewing_type != null)
if ((live_DVR_Flag || prev_viewing_type.equalsIgnoreCase("Tune"))
&& viewing_type.equalsIgnoreCase("DvrEvent"))
if (tmsId != null)
if (!prev_tmsId.equalsIgnoreCase(tmsId))
if (live_DVR_Flag)
// should change the event name to "Live DVR"
if (!prev_event_type.equalsIgnoreCase("DVR_EOE"))
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, "LiveDVR", prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, dvr_time_watched, manual_ffx,
manual_ffr);
ae.outputResult(output);
dvr_time_watched = 0;
manual_ffr = 0;
manual_ffx = 0;
setPreviousValues();
live_DVR_Flag = false;
if (tmsId != null)
if (prev_tmsId.equalsIgnoreCase(tmsId))
if (event_type != null && content_start != 0 && content_end != 0)
live_DVR_Flag = true;
// ******* total play time
if (event_type.equalsIgnoreCase("DVR_PLAY") || event_type.equalsIgnoreCase("DVR_PAUSE"))
dvr_time_watched += (content_end - content_start);
// ********* total ffx time
if (event_type.contains("FWD_START") && !event_type.contains("SKIP"))
manual_ffx += (content_end - content_start);
// ********** total ffr time
if (event_type.contains("FWD_END") && !event_type.contains("SKIP"))
manual_ffr += (content_end - content_start);
// ******** special case DVR to tune
if (viewing_type != null && prev_viewing_type != null)
if ((live_DVR_Flag || prev_viewing_type.equalsIgnoreCase("DvrEvent"))
&& viewing_type.equalsIgnoreCase("Tune"))
if (tmsId != null)
if (!prev_tmsId.equalsIgnoreCase(tmsId))
if (live_DVR_Flag)
tune_duration = prev_timeEnded - prev_timeStarted;
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, "LiveDVR", prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated, 0, 0,
tune_duration, manual_ffx, manual_ffr);
ae.outputResult(output);
prev_timeEnded = prev_timeStarted = 0;
setPreviousValues();
tune_duration = 0;
manual_ffr = 0;
manual_ffx = 0;
live_DVR_Flag = false;
if (tmsId != null)
if (prev_tmsId.equalsIgnoreCase(tmsId))
if (timeEnded != 0)
prev_timeEnded = timeEnded;
// ***** For Tune events
if (prev_viewing_type.equalsIgnoreCase("Tune"))
if (tmsId != null)
if (!prev_tmsId.equalsIgnoreCase(tmsId))
if (prev_timeEnded != 0)
tune_duration = prev_timeEnded - prev_timeStarted;
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated, 0, 0,
tune_duration, manual_ffx, manual_ffr);
ae.outputResult(output);
prev_timeEnded = prev_timeStarted = 0;
setPreviousValues();
tune_duration = 0;
manual_ffr = 0;
manual_ffx = 0;
if (timeEnded != 0)
prev_timeEnded = timeEnded;
// ************ for DVR events
else if (prev_viewing_type.contains("DvrEvent"))
if (tmsId != null)
if (!prev_tmsId.equalsIgnoreCase(tmsId))
if (!prev_event_type.equalsIgnoreCase("DVR_EOE"))
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, dvr_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
dvr_time_watched = 0;
manual_ffr = 0;
manual_ffx = 0;
setPreviousValues();
if (event_type != null && content_start != 0 && content_end != 0)
// ******* total play time
if (event_type.equalsIgnoreCase("DVR_PLAY") || event_type.equalsIgnoreCase("DVR_PAUSE"))
dvr_time_watched += (content_end - content_start);
// play_end = row.getCONTENT_END_EPOCH();
// ********* total ffx time
if (event_type.contains("FWD_START") && !event_type.contains("SKIP"))
manual_ffx += (content_end - content_start);
// ********** total ffr time
if (event_type.contains("FWD_END") && !event_type.contains("SKIP"))
manual_ffr += (content_end - content_start);
// ************ for Vod events
else if (prev_viewing_type.equalsIgnoreCase("VODEvent"))
if (ruid != null)
if (!prev_ruid.equalsIgnoreCase(ruid))
if (!prev_event_type.equalsIgnoreCase("DVR_EOE"))
output = setOutput(output, prev_acc_id, prev_rec_id, prev_tuner, prev_channel,
prev_show_name, prev_tmsId, prev_viewing_type, prev_event_type, prev_channelFamily,
prev_ruid, prev_suid, prev_timeStarted, prev_timeEnded, prev_datecreated,
prev_content_start, prev_content_end, vod_time_watched, manual_ffx, manual_ffr);
ae.outputResult(output);
vod_time_watched = 0;
manual_ffr = 0;
manual_ffx = 0;
setPreviousValues();
if (event_type != null && content_start != 0 && content_end != 0)
// ******* total play time
if (event_type.equalsIgnoreCase("DVR_PLAY") || event_type.equalsIgnoreCase("DVR_PAUSE"))
vod_time_watched += (content_end - content_start);
// play_end = row.getCONTENT_END_EPOCH();
// ********* total ffx time
if (event_type.contains("FWD_START") && !event_type.contains("SKIP"))
manual_ffx += (content_end - content_start);
// ********** total ffr time
if (event_type.contains("FWD_END") && !event_type.contains("SKIP"))
manual_ffr += (content_end - content_start);
return 0;
/**
*
*/
private static void setPreviousValues()
prev_acc_id = acc_id;
prev_rec_id = rec_id;
prev_tuner = tuner;
prev_channel = channel;
prev_show_name = show_name;
prev_tmsId = tmsId;
prev_viewing_type = viewing_type;
prev_event_type = event_type;
prev_channelFamily = channelFamily;
prev_ruid = ruid;
prev_suid = suid;
prev_timeStarted = timeStarted;
prev_timeEnded = timeEnded;
prev_datecreated = datecreated;
prev_content_start = content_start;
prev_content_end = content_end;
/**
* @param output
* @param accId
* @param recId
* @param string
* @param channel
* @param showName
* @param tmsId
* @param eventName
* @param eventType
* @param channelFamily
* @param ruid
* @param suid
* @param timeStarted
* @param timeEnded
* @param fieldAsTimestamp2
* @param contentStart
* @param contentEnd
* @param duration
* @param manualFfx
* @param manualFfr
*/
private static NzaeRecord setOutput(NzaeRecord output, String accId, String recId, String string, String channel,
String showName, String tmsId, String eventName, String eventType, String channelFamily, String ruid,
int suid, double timeStarted, double timeEnded, Timestamp fieldAsTimestamp2, double contentStart,
double contentEnd, double duration, double manualFfx, double manualFfr)
output.setField(0, accId);
output.setField(1, recId);
output.setField(2, string);
output.setField(3, channel);
output.setField(4, showName);
output.setField(5, tmsId);
output.setField(6, eventName);
output.setField(7, eventType);
output.setField(8, channelFamily);
output.setField(9, ruid);
output.setField(10, suid == 0 ? null : suid);
output.setField(11, timeStarted == 0 ? null : timeStarted);
output.setField(12, timeEnded == 0 ? null : timeEnded);
output.setField(13, fieldAsTimestamp2);
output.setField(14, contentStart == 0 ? null : contentStart);
output.setField(15, contentEnd == 0 ? null : contentEnd);
output.setField(16, duration);
output.setField(17, manualFfx);
output.setField(18, manualFfr);
return output;
/**
* @param meta
*/
private static void validateInput(NzaeMetadata meta)
if (meta.getOutputColumnCount() != 19)
throw new NzaeException("expecting 19 output columns ");
if (meta.getInputColumnCount() != 16)
throw new NzaeException("expecting 16 input columns");
if (meta.getInputNzType(0) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(0) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("first input column (Account id hashed) expected to be a string type");
if (meta.getInputNzType(1) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(1) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("second input column (Receiver id hashed) expected to be a string type");
if (meta.getInputNzType(2) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(2) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("third input column (Tuner) expected to be a string type");
if (meta.getInputNzType(3) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(3) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("fourth input column (Channel) expected to be a string type");
if (meta.getInputNzType(4) != NzaeDataTypes.NZUDSUDX_NATIONAL_FIXED
&& meta.getInputNzType(4) != NzaeDataTypes.NZUDSUDX_NATIONAL_VARIABLE)
throw new NzaeException("fifth input column (Show name) expected to be a string type");
if (meta.getInputNzType(5) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(5) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("sixth input column (TMS_ID) expected to be a string type");
if (meta.getInputNzType(6) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(6) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("seventh input column (Event Name) expected to be a string type");
if (meta.getInputNzType(7) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(7) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("eighth input column (Event type) expected to be a string type");
if (meta.getInputNzType(8) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(8) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("nineth input column (CHANNEL_FAMILY) expected to be a string type");
if (meta.getInputNzType(9) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(9) != NzaeDataTypes.NZUDSUDX_VARIABLE)
throw new NzaeException("thenth input column (RUID) expected to be a string type");
if (meta.getInputNzType(10) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(10) != NzaeDataTypes.NZUDSUDX_INT32)
throw new NzaeException("eleventh input column (SUID) expected to be a integer type");
if (meta.getInputNzType(11) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(11) != NzaeDataTypes.NZUDSUDX_INT64)
throw new NzaeException("twelfth input column (Start Epoch) expected to be a Big Integer type");
if (meta.getInputNzType(12) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(12) != NzaeDataTypes.NZUDSUDX_INT64)
throw new NzaeException("thirteenth input column (End Epoch) expected to be a Big Integer type");
if (meta.getInputNzType(13) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(13) != NzaeDataTypes.NZUDSUDX_TIMESTAMP)
throw new NzaeException("fourteenth input column (Date created) expected to be a timestamp type");
if (meta.getInputNzType(14) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(14) != NzaeDataTypes.NZUDSUDX_INT64)
throw new NzaeException("fifteenth input column (Content start date) expected to be a Big Integer type");
if (meta.getInputNzType(15) != NzaeDataTypes.NZUDSUDX_FIXED
&& meta.getInputNzType(15) != NzaeDataTypes.NZUDSUDX_INT64)
throw new NzaeException("sixteenth input column (Content end date) expected to be a big Integer type");
【讨论】：
请分享实际答案 @DavidJ 已经 3 年多了，但我会试着回忆一下这个要求，也许它会帮助你理解我的代码并帮助你的事业。这是关于计算 D### 网络电视观看次数。当一些人一旦改变频道或使用跳过或FF或RW或打开或关闭它，点播，录制的鞋子，每个事件都会被发送回有线电视提供商。提供商使用此信息来计算人们观看频道的次数、观看的广告、跳过的内容和观看时间。一旦计算出来，他们就会将此信息出售给广告销售以获取利润，并且还用于查找任何节目的收视率。 大部分代码是查找要插入数据库的内容。我从表的顶部开始，一次处理一行，只有在节目结束或用户关闭电源时才将其插入数据库。还有其他情况，例如如果用户 FFX 他转发的位不计为视图。 记住一个节目不是一个视图 一个节目可能有多个视图，从 10 分钟开始然后暂停 - 一个视图，恢复 3 秒 FFX- 1 个视图，恢复 ->5 分钟 - > 广告 -> 1 分钟 -> 跳过 --- 1 次查看简历--> 完成显示 -- 1 次查看 --> 下一个显示等等。如果您可以忽略这里发生的所有逻辑和胡言乱语，也许您会找到所需的东西。希望对你有帮助以上是关于Netezza Java UDTF 自定义函数的主要内容，如果未能解决你的问题，请参考以下文章
Hive--10---函数----自定义函数 (UDF-UDAF-UDTF)