[jira] [Commented] (HIVE-16575) Support for 'UNIQUE' and 'NOT NULL' constraints

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-16575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216380#comment-16216380 ] 

Lefty Leverenz commented on HIVE-16575:
---------------------------------------

Doc note:  UNIQUE needs to be added to the list of reserved keywords in the DDL wikidoc, and the UNIQUE and NOT NULL constraints need to be documented (with version information) in these Create Table and Alter Table sections:

* [DDL -- Reserved Keywords | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-ReservedKeywords]
* [DDL -- Create Table -- Constraints | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Constraints]
* [DDL -- Alter Table Constraints | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTableConstraints]

> Support for 'UNIQUE' and 'NOT NULL' constraints
> -----------------------------------------------
>
>                 Key: HIVE-16575
>                 URL: https://issues.apache.org/jira/browse/HIVE-16575
>             Project: Hive
>          Issue Type: New Feature
>          Components: CBO, Logical Optimizer, Parser
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>              Labels: TODOC3.0, incompatibleChange, releasenotes
>             Fix For: 3.0.0
>
>         Attachments: HIVE-16575.01.patch, HIVE-16575.02.patch, HIVE-16575.03.patch, HIVE-16575.04.patch, HIVE-16575.patch
>
>
> Follow-up on HIVE-13076.
> This issue add support for SQL 'UNIQUE' and 'NOT NULL' constraints when we create a table / alter a table (https://www.postgresql.org/docs/9.6/static/sql-createtable.html).
> As with PK and FK constraints, currently we do not enforce them; thus, the constraints need to use the DISABLE option, but they will be stored and can be enabled for rewriting/optimization using RELY.
> This patch also adds support for inlining the constraints next to the column type definition, i.e., 'column constraints'.
> Some examples of the extension to the syntax included in the patch:
> {code:sql}
> CREATE TABLE table3 (x string NOT NULL DISABLE, PRIMARY KEY (x) DISABLE, CONSTRAINT fk1 FOREIGN KEY (x) REFERENCES table2(a) DISABLE); 
> CREATE TABLE table4 (x string CONSTRAINT nn4_1 NOT NULL DISABLE, y string CONSTRAINT nn4_2 NOT NULL DISABLE, UNIQUE (x) DISABLE, CONSTRAINT fk2 FOREIGN KEY (x) REFERENCES table2(a) DISABLE, 
> CONSTRAINT fk3 FOREIGN KEY (y) REFERENCES table2(a) DISABLE);
> CREATE TABLE table12 (a STRING CONSTRAINT nn12_1 NOT NULL DISABLE NORELY, b STRING);
> CREATE TABLE table13 (a STRING NOT NULL DISABLE RELY, b STRING);
> CREATE TABLE table14 (a STRING CONSTRAINT nn14_1 NOT NULL DISABLE RELY, b STRING);
> CREATE TABLE table15 (a STRING REFERENCES table4(x) DISABLE, b STRING);
> CREATE TABLE table16 (a STRING CONSTRAINT nn16_1 REFERENCES table4(x) DISABLE RELY, b STRING);
> ALTER TABLE table16 CHANGE a a STRING REFERENCES table4(x) DISABLE NOVALIDATE;
> ALTER TABLE table12 CHANGE COLUMN b b STRING CONSTRAINT nn12_2 NOT NULL DISABLE NOVALIDATE;
> ALTER TABLE table13 CHANGE b b STRING NOT NULL DISABLE NOVALIDATE;
> {code}



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