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Added Release notes for voyager 1.8.9 release #2185

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Jan 15, 2025
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Added Release notes for voyager 1.8.9 release #2185

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27 changes: 27 additions & 0 deletions RELEASE_NOTES.md
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Included here are the release notes for the [YugabyteDB Voyager](https://docs.yugabyte.com/preview/migrate/) v1 release series. Content will be added as new notable features and changes are available in the patch releases of the YugabyteDB v1 series.

## v1.8.9 - January 14, 2025

### New Features
- Implemented a new algorithm for migration complexity determination that accounts for all potential issues, including unsupported query constructs, PL/pgSQL objects, and incompatible data types.
- Introduced migration complexity explanations in the PostgreSQL assessment report, summarising high-impact issues and illustrating how the overall complexity level is determined.

### Enhancements
- Enhanced Assessment and Schema Analysis reports to detect unsupported PostgreSQL features from PG 12 up to PG 17, including:
- Regexp functions (`regexp_count`, `regexp_instr`, `regexp_like`)
- Security Invoker Views
- JSON **constructor** and JSON **Query functions**
- IS_JSON predicate clauses(`IS_JSON`, `IS JSON SCALAR`, `IS JSON OBJECT`, `IS JSON ARRAY`)
- Aggregate functions like `anyvalue`, `range_agg`, `range_intersect_agg`
- COPY command syntax such as `COPY FROM ... WHERE` and `COPY ... ON_ERROR`
- **Multirange datatypes** like `int4multirange`, `int8multirange`, `datemultirange` etc..
- `FETCH FIRST … WITH TIES` subclause in `SELECT` statement
- Foreign Key referencing a partitioned table
- JSONB Subscripting in DML, DDL or PL/PGSQL
- `UNIQUE NULLS NOT DISTINCT` in `CREATE/ALTER TABLE` statement
- The **deterministic** attribute in `CREATE COLLATION`
- `MERGE` statements

### Bug Fixes
- Fixed an [issue](https://github.com/yugabyte/yb-voyager/issues/2034) where import data failed for tables whose datafile paths exceeded 250 characters. The fix is backward compatible, allowing migrations started with older voyager version to continue seamlessly.
- Fixed an issue where logic for detecting unsupported PostgreSQL versions was giving false positives.


## v1.8.8 - December 24, 2024

### Enhancements
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