Question

我必须从csv文件中的hive表导出数据，其中的字段用双引号括起来。

到目前为止，我可以使用以下查询生成不带引号的csv

INSERT OVERWRITE DIRECTORY '/user/vikas/output'
ROW FORMAT DELIMITED 
FIELDS TERMINATED BY ','
SELECT QUERY

生成的输出类似于

1,Vikas Saxena,Banking,JL5

但是，我需要输出为

"1","Vikas Saxena","Banking","JL5"

我尝试将查询更改为

INSERT OVERWRITE DIRECTORY '/user/vikas/output'
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
   "separatorChar" = ",",
   "quoteChar"     = "\"",
   "escapeChar"    = "\\"
)
SELECT QUERY

但它显示错误

Error while compiling statement: FAILED: ParseException line 1:0 cannot recognize input near 'ROW' 'FORMAT' 'SERDE'

Answer 1

创建外部表：

CREATE EXTERNAL TABLE new_table(field1 type1, ...)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
"separatorChar" = ",",
"quoteChar" = "\""
)
STORED AS TEXTFILE
LOCATION '/user/vikas/output';

然后选择进入该表：

insert into new_table select * from original_table;

然后，您的CSV将位于/ user / vikas / output

上的磁盘上

将hive查询结果输出为引号

1 个答案: