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https://issues.apache.org/jira/browse/HIVE-13688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394588#comment-15394588
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Xuefu Zhang commented on HIVE-13688:
------------------------------------
There are 4 kinds of variables, including system variables and env variables.
which can exist in both hosts and are not always defined by the user. Thus,
user query can potentially pick up the wrong value by substitution.
> Variable substitutions not working for shell commands in beeline
> ----------------------------------------------------------------
>
> Key: HIVE-13688
> URL: https://issues.apache.org/jira/browse/HIVE-13688
> Project: Hive
> Issue Type: Bug
> Components: Beeline
> Affects Versions: 1.1.0
> Reporter: Naveen Gangam
> Assignee: Naveen Gangam
>
> Appears that the variable substitutions work fine for DML and DDL commands.
> > set hivevar:v1=databases;
> No rows affected (0.004 seconds)
> > show ${v1};
> +----------------+--+
> | database_name |
> +----------------+--+
> | default |
> +----------------+--+
> 1 row selected (0.243 seconds)
> > set hivevar:v1=tmp;
> No rows affected (0.061 seconds)
> > create table ${v1} (col1 string);
> No rows affected (0.065 seconds)
> > describe ${v1};
> INFO : Compiling
> command(queryId=hive_20160504105151_cb6ab7f1-26ac-4733-80ed-13a5134ba2b5):
> describe tmp
> INFO : Executing
> command(queryId=hive_20160504105151_cb6ab7f1-26ac-4733-80ed-13a5134ba2b5):
> describe tmp
> +-----------+------------+----------+--+
> | col_name | data_type | comment |
> +-----------+------------+----------+--+
> | col1 | string | |
> +-----------+------------+----------+--+
> 1 row selected (0.121 seconds)
> But it does not appear to work for shell commands (introduced in HIVE-6791 )
> > !sh sudo -u hdfs hdfs dfs -mkdir /user/root/${v1}
> mkdir: `/user/root/${v1}': No such file or directory <========== problem
> Command failed with exit code = 1
> > !sh echo ${v1};
> ${v1};
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