test(render): pin the FromRaw always-aliased contract

statement/impl/src/test/java/org/eclipse/daanse/sql/statement/render/FromRawAliasingTest.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+package org.eclipse.daanse.sql.statement.render;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.eclipse.daanse.jdbc.db.dialect.db.common.AnsiDialect;
+import org.eclipse.daanse.sql.statement.api.Expressions;
+import org.eclipse.daanse.sql.statement.api.From;
+import org.eclipse.daanse.sql.statement.api.SelectStatementBuilder;
+import org.eclipse.daanse.sql.statement.api.model.TableAlias;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Pins the {@code FromRaw} derived-table contract: the renderer ALWAYS emits the alias
+ * (spelled {@code as} per {@code allowsFromAlias}), so producers never consult
+ * {@code requiresAliasForFromQuery} — the rolap statistics probes rely on this.
+ */
+class FromRawAliasingTest {
+
+    @Test
+    void fromRawIsAlwaysAliased() {
+        SelectStatementBuilder q = SelectStatementBuilder.create();
+        q.project(Expressions.countStar(), null);
+        q.from(From.raw("select * from foo", TableAlias.of("init")));
+        String sql = new DialectSqlRenderer(new AnsiDialect()).render(q.build()).sql();
+        assertEquals("select COUNT(*) as \"c0\" from (select * from foo) as \"init\"", sql);
+    }
+
+    @Test
+    void fromRawAliasWithoutAsKeywordWhenDialectForbidsFromAlias() {
+        AnsiDialect noAs = new AnsiDialect() {
+            @Override
+            public boolean allowsFromAlias() {
+                return false;
+            }
+        };
+        SelectStatementBuilder q = SelectStatementBuilder.create();
+        q.project(Expressions.countStar(), null);
+        q.from(From.raw("select * from foo", TableAlias.of("init")));
+        String sql = new DialectSqlRenderer(noAs).render(q.build()).sql();
+        assertEquals("select COUNT(*) as \"c0\" from (select * from foo) \"init\"", sql);
+    }
+}