HiveContext.sql( "insert into" )

Question

我正在尝试使用 hiveContext 插入数据：

/* table filedata
CREATE TABLE `filedata`(
  `host_id` string,
  `reportbatch` string,
  `url` string,
  `datatype` string,
  `data` string,
  `created_at` string,
  `if_del` boolean)
*/
hiveContext.sql("insert into filedata (host_id, data) values ("a1e1", "welcome")")

错误并尝试使用"选择"：

hiveContext.sql("select "a1e1" as host_id, "welcome"as data").write.mode("append").saveAsTable("filedata")
/*
stack trace 
java.lang.ArrayIndexOutOfBoundsException: 2
*/

它需要这样的所有列：

hc.sql("select "a1e1" as host_id,
          "xx" as reportbatch,
          "xx" as url,
          "xx" as datatype,
          "welcome" as data,
          "2017" as created_at, 
          1 as if_del").write.mode("append").saveAsTable("filedata")

有没有办法插入指定的列？例如，仅插入列" host_id"one_answers" data"。

Answer 1

据我所知，Hive不支持值插入某些列

来自文档

值子句中列出的每一行都插入表格tablename。

必须为表中的每个列提供值。标准SQL语法允许用户仅将值插入一些列尚未支持。为了模仿标准SQL，无效为列提供了用户不希望为。

分配值

因此，您应该尝试以下操作：

  val data = sqlc.sql("select 'a1e1', null, null, null, 'welcome', null, null, null")
  data.write.mode("append").insertInto("filedata")

参考此处

Answer 2

，如果您使用的是Row columnar文件格式（例如ORC），则可以执行此操作。请参阅下面的工作示例。这个示例是在Hive中，但可以与HiveContext一起工作。

hive> use default;
OK
Time taken: 1.735 seconds
hive> create table test_insert (a string, b string, c string, d int) stored as orc;
OK
Time taken: 0.132 seconds
hive> insert into test_insert (a,c) values('x','y');
Query ID = user_20171219190337_b293c372-5225-4084-94a1-dec1df9e930d
Total jobs = 1
Launching Job 1 out of 1

Status: Running (Executing on YARN cluster with App id application_1507021764560_1375895)
--------------------------------------------------------------------------------
        VERTICES      STATUS  TOTAL  COMPLETED  RUNNING  PENDING  FAILED  KILLED
--------------------------------------------------------------------------------
Map 1 ..........   SUCCEEDED      1          1        0        0       0       0
--------------------------------------------------------------------------------
VERTICES: 01/01  [==========================>>] 100%  ELAPSED TIME: 4.06 s
--------------------------------------------------------------------------------
Loading data to table default.test_insert
Table default.test_insert stats: [numFiles=1, numRows=1, totalSize=417, rawDataSize=254]
OK
Time taken: 6.828 seconds
hive> select * from test_insert;
OK
x       NULL    y       NULL
Time taken: 0.142 seconds, Fetched: 1 row(s)
hive>