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Vinod Sridharan db6a3de7fd Merged PR 1627378: [Composite POC] Create single composite operator class
### Does this PR have any customer impact?
No
### Type (Feature, Refactoring, Bugfix, DevOps, Testing, Perf, etc)
Feature
### Does it involve schema level changes? (Table, Column, Index, UDF, etc level changes)
yes
### Are you introducing any new config? If yes, do you have tests with and without them being set?
Yes
### ChangeLog (Refer [Template](../oss/CHANGELOG.md))

### Description
As part of testing out the composite operator classes, introduce a new composite operator class for Bson. This will be behind a test only GUC and will be for testing composite index pushdown.

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#### AI description  (iteration 1)
#### PR Classification
New feature

#### PR Summary
This pull request introduces a new composite operator class for BSON GIN indexes in PostgreSQL.
- Added `bson_gin_composite_entrypoint.c` to implement GIN operator functions for BSON composite indexes.
- Created test cases in `bson_composite_index_tests_insert_terms.out` to validate term generation for composite paths.
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2025-04-07 11:39:49 +08:00
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