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https://issues.apache.org/jira/browse/FLINK-5441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892592#comment-15892592
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ASF GitHub Bot commented on FLINK-5441:
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Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/3107
I think the point is that we don't know if the table will ever be used
again. If we unregister them after optimization, we can not have multiple
`toDataStream()` calls for one table.
> Directly allow SQL queries on a Table
> -------------------------------------
>
> Key: FLINK-5441
> URL: https://issues.apache.org/jira/browse/FLINK-5441
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Jark Wu
>
> Right now a user has to register a table before it can be used in SQL
> queries. In order to allow more fluent programming we propose calling SQL
> directly on a table. An underscore can be used to reference the current table:
> {code}
> myTable.sql("SELECT a, b, c FROM _ WHERE d = 12")
> {code}
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