[jira] [Commented] (SPARK-29660) Dropping columns and changing column names/types are prohibited in VIEW definition

["Xiao Li (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-29660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985706#comment-16985706 ] 

Xiao Li commented on SPARK-29660:
---------------------------------

It is cool that Spark supports them, but pgSQL has not supported them yet. 

> Dropping columns and changing column names/types are prohibited in VIEW definition
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-29660
>                 URL: https://issues.apache.org/jira/browse/SPARK-29660
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Takeshi Yamamuro
>            Priority: Major
>
> In PostgreSQL, the three DDL syntaxes for VIEW cannot be accepted;
> {code:java}
> -- should fail
> CREATE OR REPLACE VIEW viewtest AS
> 	SELECT a FROM viewtest_tbl WHERE a <> 20;
> ERROR:  cannot drop columns from view
> -- should fail
> CREATE OR REPLACE VIEW viewtest AS
> 	SELECT 1, * FROM viewtest_tbl;
> ERROR:  cannot change name of view column "a" to "?column?"
> -- should fail
> CREATE OR REPLACE VIEW viewtest AS
> 	SELECT a, b::numeric FROM viewtest_tbl;
> ERROR:  cannot change data type of view column "b" from integer to numeric
> {code}



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