[IGNITE-19229] Schema validation during tx processing: validators

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0
• Labels: iep-110 ignite-3
• Epic Link: Schema synchronization, Part 2
• Assignee: Roman Puchkovskiy
• Reporter: Roman Puchkovskiy
• Reviewer: Ivan Bessonov
• Created: 05/Apr/23 08:20
• Updated: 04/Sep/24 16:10
• Resolved: 28/Nov/23 07:03

Description

As per https://cwiki.apache.org/confluence/display/IGNITE/IEP-110%3A+Schema+synchronization%3A+basic+schema+changes , the following schema changes are forward-compatible:

1. Creating a table
2. Adding a nullable column or a column having a default value
3. Renaming a column
4. Dropping a constraint (including NOT NULL constraint)
5. Changing a column type when any value in the old type has an exact representation in the new type

Other schema changes are not compatible.

The supported type changes follow:

• Widening conversions between integral types (like int->long)
• Widening conversions between floating-point types (float->double)
• Widening conversions between date-time types (increasing precision)
• Widening conversions between decimal types (increasing precision)
• Increasing allowed length of VARCHAR
• Increasing allowed length of VARBINARY
• Conversions of anything to VARCHAR with enough capacity

Issue Links

• relates to: IGNITE-20416 IncompatibleSchemaException thrown when schema change is compatible
• links to: GitHub Pull Request #2872