chl-wxp commented on issue #10339:
URL: https://github.com/apache/seatunnel/issues/10339#issuecomment-3752889356
```mermaid
flowchart TD
%% ========= Entry =========
A[Start: Non-Relational Source Initialization] --> B{Is 'schema' defined
in config?}
%% ========= Step 1: Local Schema =========
B -- Yes --> S1[Use embedded schema from config]
S1 --> Z[Build CatalogTable and finish]
%% ========= Step 2: No local schema =========
B -- No --> C{Is Metalake configured in env?}
%% ========= Step 2a: Seatunnel env =========
C -- Yes --> E1[Read metalake_enabled / metalake_type / metalake_url from
env]
%% ========= Step 3: OS env =========
C -- No --> D{Are Metalake variables in OS env?}
D -- Yes --> E2[Read metalake_enabled / metalake_type / metalake_url from
OS env]
%% ========= Step 4: Connector config =========
D -- No --> E3[Read metalake_type / metalake_url from connector config]
%% ========= Unified metadata path =========
E1 --> F
E2 --> F
E3 --> F
%% ========= Schema reference =========
F{Is schema_path or schema_url defined?}
F -- schema_url --> G1[Use schema_url directly]
F -- schema_path --> G2[Compose full schema_url using metalake_url +
schema_path]
%% ========= Step 5 =========
G1 --> H
G2 --> H
H[Select REST detector by metalake_type]
%% ========= Step 6 =========
H --> I[Call REST API and get responseBody]
I --> J[Type Mapper converts response to internal types]
J --> K[Build CatalogTable from mapped schema]
%% ========= End =========
K --> Z[Schema ready for Source execution]
```
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