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https://issues.apache.org/jira/browse/SPARK-28329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17491884#comment-17491884
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gabrywu commented on SPARK-28329:
---------------------------------
[~smilegator] Is there a plan to support that? select into a scalar variable? I
think it's useful to optimize some SQLs like this
{code:SQL}
select max(id) into ${max_id} from db.tableA;
select * from db.tableB where id >= ${max_id};
{code}
It's better than the following SQL, because it can push down the filters id >=
${max_id}
{code:SQL}
select * from db.tableB where id >= (select max(id) from db.tableA);
{code}
> SELECT INTO syntax
> ------------------
>
> Key: SPARK-28329
> URL: https://issues.apache.org/jira/browse/SPARK-28329
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Yuming Wang
> Priority: Major
>
> h2. Synopsis
> {noformat}
> [ WITH [ RECURSIVE ] with_query [, ...] ]
> SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ]
> * | expression [ [ AS ] output_name ] [, ...]
> INTO [ TEMPORARY | TEMP | UNLOGGED ] [ TABLE ] new_table
> [ FROM from_item [, ...] ]
> [ WHERE condition ]
> [ GROUP BY expression [, ...] ]
> [ HAVING condition [, ...] ]
> [ WINDOW window_name AS ( window_definition ) [, ...] ]
> [ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] select ]
> [ ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST |
> LAST } ] [, ...] ]
> [ LIMIT { count | ALL } ]
> [ OFFSET start [ ROW | ROWS ] ]
> [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ]
> [ FOR { UPDATE | SHARE } [ OF table_name [, ...] ] [ NOWAIT ] [...] ]
> {noformat}
> h2. Description
> {{SELECT INTO}} creates a new table and fills it with data computed by a
> query. The data is not returned to the client, as it is with a normal
> {{SELECT}}. The new table's columns have the names and data types associated
> with the output columns of the {{SELECT}}.
>
> {{CREATE TABLE AS}} offers a superset of the functionality offered by
> {{SELECT INTO}}.
> [https://www.postgresql.org/docs/11/sql-selectinto.html]
> [https://www.postgresql.org/docs/11/sql-createtableas.html]
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