Figured it out
fromhttps://cwiki.apache.org/Hive/languagemanual-udf.html#LanguageManualUDF-ComplexTypeConstructors
It should beINSERT INTO TABLE oc SELECT named_struct('a', x, 'b', y) FROM tc;
--- On Wed, 2/13/13, Dean Wampler <[email protected]> wrote:
From: Dean Wampler <[email protected]>
Subject: Re: INSERT INTO table with STRUCT, SELECT FROM
To: [email protected]
Date: Wednesday, February 13, 2013, 12:47 PM
Hmm. I tried the following hacks, but all wouldn't parse. Ideas?
I changed:
... select struct(x,y) ...
to
... select struct(x,y) as struct<a:int,b:int> ...
... select cast(struct(x,y) as struct<a:int,b:int>) ... ... select struct(x
as a,y as b) ...
Okay, but there is a hack that does work; By pass INSERT INTO and just write to
the directory:
INSERT DIRECTORY '/path/to/table/directory' SELECT ...;
Just be careful it doesn't clobber any files already there. I'm paranoid, so I
would write to a different directory and then move the files over...
dean
On Wed, Feb 13, 2013 at 1:26 PM, Michael Malak <[email protected]> wrote:
Is it possible to INSERT INTO TABLE t SELECT FROM where t has a column with a
STRUCT?
Based on
http://grokbase.com/t/hive/user/109r87hh3e/insert-data-into-a-column-of-complex-type
I thought perhaps the following would work:
echo 1,2 >twovalues.csv
hive
CREATE TABLE tc (x INT, y INT) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
LOAD DATA LOCAL INPATH 'twovalues.csv' INTO TABLE tc;
CREATE TABLE oc (z STRUCT<a: int, b: int>);
INSERT INTO TABLE oc SELECT struct(x,y) FROM tc;
but when I do the above I get:
FAILED: SemanticException [Error 10044]: Line 1:18 Cannot insert into target
table because column number/types are different 'oc': Cannot convert column 0
from struct<col1:int,col2:int> to struct<a:int,b:int>.
--
Dean Wampler, Ph.D.thinkbiganalytics.com+1-312-339-1330
