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https://issues.apache.org/jira/browse/IGNITE-13752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrey Mashenkov updated IGNITE-13752:
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Description:
h3. Motivation.
The Live-schema concept supposes a tuple of old-version can be upgraded to a
tuple of new-version automatically.
h3. Description.
Table SchemaManager tracks schema changes and keeps a history of changes.
Let's implements the mechanics to apply these historical changes to a Row to
upgrade to the latest version.
was:
h3. Motivation.
The Live-schema concept supposes a tuple of old-version can be upgraded to a
tuple of new-version automatically.
h3. Description.
Table SchemaManager tracks schema changes and keeps a history of changes.
Let's implements the mechanics to apply these historical changes to a Row to
upgrade to the latest version.
Additionally,
* investigate if some changes can be squashed, e.g. "drop column" and "add
column" of the same name and create a ticket for this.
* Investigate if row upgrade can be "No-op" and just rises a schema version in
a Row in-place without copying (e.g. a Row is tombstone
or 'null' row was dropped and maybe we can rewrite the whole Row in-place) and
create a ticket for possible optimizations.
> Schema evolution converters.
> ----------------------------
>
> Key: IGNITE-13752
> URL: https://issues.apache.org/jira/browse/IGNITE-13752
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Andrey Mashenkov
> Priority: Major
> Labels: iep-54, ignite-3
> Fix For: 3.0.0-alpha3
>
> Original Estimate: 360h
> Remaining Estimate: 360h
>
> h3. Motivation.
> The Live-schema concept supposes a tuple of old-version can be upgraded to a
> tuple of new-version automatically.
> h3. Description.
> Table SchemaManager tracks schema changes and keeps a history of changes.
> Let's implements the mechanics to apply these historical changes to a Row to
> upgrade to the latest version.
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