Question

我在下面执行时遇到错误：

data1 = load '/user/pig/join2_genchanA.txt' using PigStorage(',')as (showname:chararray, channelname:chararray); 

data2 = load '/user/pig/join2_gennumA.txt' using PigStorage(',')as (showname:chararray, showviewer:long); 

joindata = join data1 by showname, data2 by showname; 

bat = filter joindata by channelname=='BAT'; 

foreachviewer = FOREACH bat GENERATE channelname, showviewer; 

foreachgroupall = GROUP foreachviewer all; batsum = FOREACH foreachgroupall GENERATE SUM(bat.showviewers);

现在我收到以下错误：

"2017-09-15 04:01:03,517 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1200: **Pig script failed to parse**:  <line 28, column 46> Invalid scalar projection: bat Details at logfile: /home/cloudera/pig_1504878875671.log"

请帮助我。

Answer 1

它说别名foreachgroupall中没有现场击球。

对foreachgroupall执行DESCRIBE，它将显示字段名称。

将代码段中的最后一行替换为以下一行 -

data1 = load '/user/pig/join2_genchanA.txt' using PigStorage(',') as (showname:chararray, channelname:chararray); 

data2 = load '/user/pig/join2_gennumA.txt' using PigStorage(',') as (showname:chararray, showviewer:long); 

bat = FILTER data1 BY channelname=='BAT'; 

joindata = join bat by showname, data2 by showname; 

foreachviewer = FOREACH joindata GENERATE bat::channelname AS channelname, data2::showviewer AS showviewer; 

req_stats = FOREACH(GROUP foreachviewer ALL) GENERATE SUM(foreachviewer.showviewer);

DUMP req_stats;

我建议您在读取数据集之后先过滤，而不是在连接后过滤通道名称BAT。有关详细信息，请参阅下面的代码段 -

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错误1200：Pig脚本无法解析

1 个答案: