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https://issues.apache.org/jira/browse/IGNITE-19407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730042#comment-17730042
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Pavel Pereslegin commented on IGNITE-19407:
-------------------------------------------
Command syntax:
{code:java}
ALTER TABLE <table_name> ALTER COLUMN <col_name> <action>;
<action> ::= SET DATA TYPE <new_type> [NOT NULL | NULLABLE] [DEFAULT <default
value>]| SET NOT NULL | DROP NOT NULL | SET DEFAULT <default value> | DROP
DEFAULT{code}
Example of changing the data type and dropping NOT NULL at the same time:
{code:java}
SET DATA TYPE BIGINT NULLABLE{code}
Example of changing the data type and dropping default at the same time:
{code:java}
SET DATA TYPE BIGINT DEFAULT NULL{code}
List of possible actions to change the column.
- NOT NULL -> NULLABLE allowed for any non-PK column.
- NULLABLE -> NOT NULL forbidden.
- DEFAULT -> ANY LITERAL DEFAULT allowed for any column.
- DROP DEFAULT / SET DEFAULT NULL allowed for any column.
- TYPE SCALE change forbidden
- a. TYPE PRECISION increase allowed for DECIMAL non PK column
- b. TYPE LENGTH increase allowed for STRING and BYTE_ARRAY non PK column.
- The following type transitions allowed for TYPE of non PK column:
FLOAT -> DOUBLE
INT8 -> INT16 -> INT32 -< INT64
Any other type transitions are forbidden.
> Sql. Introduce DDL command for ALTER COLUMN TYPE.
> -------------------------------------------------
>
> Key: IGNITE-19407
> URL: https://issues.apache.org/jira/browse/IGNITE-19407
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Andrey Mashenkov
> Assignee: Pavel Pereslegin
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-beta2
>
> Time Spent: 5.5h
> Remaining Estimate: 0h
>
> Introduce DDL command class.
> Implement command validation logic.
> Pass command to the CatalogService via DdlHandler.
> Validator should allow changing column DEFAULT and changing column type for
> the next cases
> {noformat}
> INT8 -> INT16 -> INT32 -> INT64
> FLOAT -> DOUBLE
> DECIMAL(10,5) -> DECIMAL(15, 5) // increasing precision only
> VARCHAR(10) -> VARCHAR(20)
> VARBINARY(10) -> VARBINARY(20)
> NOT NULL -> NULLABLE
> {noformat}
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