feat(editor): improve qualified table completion

apps/desktop/src/lib/__tests__/sql/sqlCompletionLookupTarget.spec.ts

@@ -0,0 +1,78 @@
+import { describe, expect, it } from "vitest";
+import { resolveSqlCompletionTableLookupTarget } from "@/lib/sql/sqlCompletionLookupTarget";
+
+describe("sqlCompletionLookupTarget", () => {
+  it("treats qualified table completion as a database lookup for MySQL-compatible engines", () => {
+    const target = resolveSqlCompletionTableLookupTarget({
+      currentDatabase: "default_db",
+      supportsDatabaseQualifier: true,
+      completionContext: {
+        qualifier: "game_data",
+        prefix: "",
+        suggestTables: true,
+      },
+    });
+
+    expect(target).toEqual({
+      database: "game_data",
+      filter: "",
+      qualifierDatabase: "game_data",
+    });
+  });
+
+  it("preserves the known database casing when the qualifier matches locally", () => {
+    const target = resolveSqlCompletionTableLookupTarget({
+      currentDatabase: "default_db",
+      supportsDatabaseQualifier: true,
+      knownDatabases: ["Game_Data"],
+      completionContext: {
+        qualifier: "game_data",
+        prefix: "ord",
+        suggestTables: true,
+      },
+    });
+
+    expect(target).toEqual({
+      database: "Game_Data",
+      filter: "ord",
+      qualifierDatabase: "Game_Data",
+    });
+  });
+
+  it("keeps schema-aware qualified table completion scoped to the schema", () => {
+    const target = resolveSqlCompletionTableLookupTarget({
+      currentDatabase: "app",
+      currentSchema: "public",
+      supportsDatabaseQualifier: false,
+      completionContext: {
+        qualifier: "sales",
+        prefix: "ord",
+        suggestTables: true,
+      },
+    });
+
+    expect(target).toEqual({
+      database: "app",
+      schema: "sales",
+      filter: "ord",
+    });
+  });
+
+  it("uses the current schema for unqualified table completion", () => {
+    const target = resolveSqlCompletionTableLookupTarget({
+      currentDatabase: "app",
+      currentSchema: "public",
+      supportsDatabaseQualifier: true,
+      completionContext: {
+        prefix: "ord",
+        suggestTables: true,
+      },
+    });
+
+    expect(target).toEqual({
+      database: "app",
+      schema: "public",
+      filter: "ord",
+    });
+  });
+});