hubgeter commented on code in PR #57012:
URL: https://github.com/apache/doris/pull/57012#discussion_r2447626895
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fe/fe-core/src/main/java/org/apache/doris/datasource/property/constants/MCProperties.java:
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@@ -81,6 +81,26 @@ public class MCProperties extends BaseProperties {
public static final String ACCOUNT_FORMAT_ID = "id";
public static final String DEFAULT_ACCOUNT_FORMAT = ACCOUNT_FORMAT_NAME;
+ // In the previous MaxCompute architecture, and its mapping in Doris,
+ // the hierarchy was: project / database -> table / table.
+ // When creating a catalog, users needed to specify the property
`mc.default.project`,
+ // which indicated the default project to access.
+ // In this structure, executing `SHOW DATABASES` would list other projects.
+ //
+ // After MaxCompute introduced the concept of schemas, the hierarchy
changed to:
+ // project / catalog -> schema / database -> table / table.
+ // Here, the project is at a higher level, and `SHOW DATABASES` should now
list
+ // all schemas under the current project.
+ // As a result, users need to create a separate catalog for each project,
+ // specifying a different `mc.default.project` property.
+ //
+ // To maintain compatibility with the old version,
+ // a variable is introduced:
+ // - When the property is true, the new architecture is used.
+ // - When the property is false, the old architecture is used.
+ public static final String PROJECT_SCHEMA_TABLE =
"mc.project.schema.table";
Review Comment:
fix.
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