Add support for nested data generation

[ashish-bagri]

No description provided.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
glassgen	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 25, 2025 0:56am

[Copilot]

Pull Request Overview

This pull request adds support for nested data generation by extending the schema parsing and record generation capabilities and by updating the CSV sink to flatten nested dictionaries. Key changes include:

• Added tests for flat, nested, deeply nested, and mixed schemas.
• Updated the CSV sink to flatten nested dictionaries when writing CSV data.
• Enhanced the schema parser to support nested schema fields via a new NestedSchemaField.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/test_sinks.py	Updated CSV header assertions to support order-agnostic testing.
tests/test_schema.py	Added comprehensive tests for nested and mixed schemas.
glassgen/sinks/csv_sink.py	Introduced helper functions for flattening nested dictionaries.
glassgen/schema/schema.py	Extended schema parsing and record generation to support nested data.

[github-actions]

Test Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	6	0	100%
config.py	49	0	100%
interface.py	43	5	88%	32–36
generator
__init__.py	5	0	100%
batch_controller.py	39	3	92%	16, 21–22
duplication.py	51	2	96%	25, 33
generator.py	45	1	97%	47
generators.py	63	4	93%	57, 62, 120, 125
schema
__init__.py	4	0	100%
base.py	7	0	100%
schema.py	65	2	96%	50, 86
user_schema.py	16	1	93%	30
sinks
__init__.py	13	0	100%
base.py	9	0	100%
csv_sink.py	47	1	97%	41
kafka_sink.py	28	13	53%	20–23, 27–28, 33, 36–38, 43–44, 47
webhook_sink.py	26	0	100%
yield_sink.py	10	0	100%
TOTAL	526	32	93%

[PabloPardoGarcia]

LGTM! 🚀