[jira] [Assigned] (SPARK-16217) Support SELECT INTO statement

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-16217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-16217:
------------------------------------

    Assignee:     (was: Apache Spark)

> Support SELECT INTO statement
> -----------------------------
>
>                 Key: SPARK-16217
>                 URL: https://issues.apache.org/jira/browse/SPARK-16217
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: GuangFancui(ISCAS)
>
> The *SELECT INTO* statement selects data from one table and inserts it into a new table as follows.
> {code:sql}
> SELECT column_name(s)
> INTO newtable
> FROM table1;
> {code}
> This statement is commonly used in SQL but not currently supported in SparkSQL.
> We investigated the Catalyst and found that this statement can be implemented by improving the grammar and reusing the logical plan of *CREAT TABLE AS SELECT* as follows.
> # Improve grammar: Add _INTO tableIdentifier_ to _SELECT ... FROM_ in _querySpecification_ grammar in SqlBase.g4 file.
> !https://raw.githubusercontent.com/wuxianxingkong/storage/master/selectinto_g4.png!
> For example
>  {code:sql}
> SELECT * 
> INTO NEW_TABLE 
> FROM OLD_TABLE
> {code}
> Then the grammar tree will be: 
> !https://raw.githubusercontent.com/wuxianxingkong/storage/master/selectinto_tree.png!
> Furthermore, we can argue whether it's necessary to add _INTO_ to _TRANSFORM_ in _querySpecification_
> # Add new logicalplan: _SelectIntoLogicalPlan_
> # Identify _SELECT INTO_ in the Parser: Modify _withQuerySpecification_ function. If there is _INTO tableIdentifier_, we can change it to _SelectIntoLogicalPlan_ with _withSelectInto_（custom function). 
> # Conversion in Analyzer: Convert _SelectIntoLogicalPlan_ to _CreateTableAsSelectCommand_ by adding a rule in the Analyzer. 
> *Hive support* should be opened since _CreateTableAsSelectCommand_ relies on it.
> We’ve implemented and tested the above approach. If possible, we can make some pull requests.



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