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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6198) ORC file and struct column names are case sensitive
Date Tue, 07 Oct 2014 22:54:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162736#comment-14162736
] 

Jason Dere commented on HIVE-6198:
----------------------------------

I have another issue HIVE-8386, which also involves some issues with struct fields and case
sensitivity. Your patch for HIVE-6198 does not seem to fix this issue, so I don't know how
related they are, but was just wondering if the patch I've attached for HIVE-8386 has any
effect on your fix.

> ORC file and struct column names are case sensitive
> ---------------------------------------------------
>
>                 Key: HIVE-6198
>                 URL: https://issues.apache.org/jira/browse/HIVE-6198
>             Project: Hive
>          Issue Type: Bug
>          Components: CLI, File Formats
>    Affects Versions: 0.11.0, 0.12.0
>            Reporter: Viraj Bhat
>            Assignee: Navis
>         Attachments: HIVE-6198.1.patch.txt, HIVE-6198.2.patch.txt, HIVE-6198.3.patch.txt
>
>
> HiveQL document states that the "Table names and column names are case insensitive".
But the struct behavior for ORC file is different. 
> Consider a sample text file:
> {code}
> $ cat data.txt
> line1|key11:value11,key12:value12,key13:value13|a,b,c|one,two
> line2|key21:value21,key22:value22,key23:value23|d,e,f|three,four
> line3|key31:value31,key32:value32,key33:value33|g,h,i|five,six
> {code}
> Creating a table stored as txt and then using this to create a table stored as orc 
> {code}
> CREATE TABLE orig (
>   str STRING,
>   mp  MAP<STRING,STRING>,
>   lst ARRAY<STRING>,
>   strct STRUCT<A:STRING,B:STRING>
> ) ROW FORMAT DELIMITED
>     FIELDS TERMINATED BY '|'
>     COLLECTION ITEMS TERMINATED BY ','
>     MAP KEYS TERMINATED BY ':';
> LOAD DATA LOCAL INPATH 'data.txt' INTO TABLE orig;
> CREATE TABLE tableorc (
>   str STRING,
>   mp  MAP<STRING,STRING>,
>   lst ARRAY<STRING>,
>   strct STRUCT<A:STRING,B:STRING>
> ) STORED AS ORC;
> INSERT OVERWRITE TABLE tableorc SELECT * FROM orig;
> {code}
> Suppose we project columns or read the *strct* columns for both table types, here are
the results. I have also tested the same with *RC*. The behavior is similar to *txt* files.
> {code}
> hive> SELECT * FROM orig;
> line1   {"key11":"value11","key12":"value12","key13":"value13"} ["a","b","c"]  
> {"a":"one","b":"two"}
> line2   {"key21":"value21","key22":"value22","key23":"value23"} ["d","e","f"]  
> {"a":"three","b":"four"}
> line3   {"key31":"value31","key32":"value32","key33":"value33"} ["g","h","i"]  
> {"a":"five","b":"six"}
> Time taken: 0.126 seconds, Fetched: 3 row(s)
> hive> SELECT * FROM tableorc;
> line1   {"key12":"value12","key11":"value11","key13":"value13"} ["a","b","c"]  
> {"A":"one","B":"two"}
> line2   {"key21":"value21","key23":"value23","key22":"value22"} ["d","e","f"]  
> {"A":"three","B":"four"}
> line3   {"key33":"value33","key31":"value31","key32":"value32"} ["g","h","i"]  
> {"A":"five","B":"six"}
> Time taken: 0.178 seconds, Fetched: 3 row(s)
> hive> SELECT strct FROM tableorc;
> {"a":"one","b":"two"}
> {"a":"three","b":"four"}
> {"a":"five","b":"six"}
> hive>SELECT strct.A FROM orig;
> one
> three
> five
> hive>SELECT strct.a FROM orig;
> one
> three
> five
> hive>SELECT strct.A FROM tableorc;
> one
> three
> five
> hive>SELECT strct.a FROM tableorc;
> FAILED: Execution Error, return code 2 from
> org.apache.hadoop.hive.ql.exec.mr.MapRedTask
> MapReduce Jobs Launched: 
> Job 0: Map: 1   HDFS Read: 0 HDFS Write: 0 FAIL
> {code}
> So it seems that ORC behaves differently for struct columns. Also why are we storing
the column names for struct for the other types as CASE SENSITIVE? What is the standard for
Hive QL with respect to structs?
> Regards
> Viraj



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