Draft: [DRIVER-786] Validate SELECT without FROM support

integration-tests/src/test/java/com/datastax/oss/driver/core/cql/SelectWithoutFromIT.java

@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.datastax.oss.driver.core.cql;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assume.assumeNoException;
+
+import com.datastax.oss.driver.api.core.CqlSession;
+import com.datastax.oss.driver.api.core.cql.ColumnDefinitions;
+import com.datastax.oss.driver.api.core.cql.PreparedStatement;
+import com.datastax.oss.driver.api.core.cql.ResultSet;
+import com.datastax.oss.driver.api.core.cql.Row;
+import com.datastax.oss.driver.api.core.servererrors.InvalidQueryException;
+import com.datastax.oss.driver.api.core.servererrors.SyntaxError;
+import com.datastax.oss.driver.api.core.type.DataTypes;
+import com.datastax.oss.driver.api.testinfra.ccm.CcmRule;
+import com.datastax.oss.driver.api.testinfra.session.SessionRule;
+import com.datastax.oss.driver.categories.ParallelizableTests;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.rules.RuleChain;
+import org.junit.rules.TestRule;
+
+@Category(ParallelizableTests.class)
+public class SelectWithoutFromIT {
+
+  private static final CcmRule CCM_RULE = CcmRule.getInstance();
+
+  private static final SessionRule<CqlSession> SESSION_RULE = SessionRule.builder(CCM_RULE).build();
+
+  @ClassRule
+  public static final TestRule CHAIN = RuleChain.outerRule(CCM_RULE).around(SESSION_RULE);
+
+  @Test
+  public void should_execute_select_without_from() {
+    CqlSession session = SESSION_RULE.session();
+    ResultSet result;
+    try {
+      result = session.execute("SELECT 1");
+    } catch (InvalidQueryException | SyntaxError e) {
+      assumeNoException("Server does not support SELECT without FROM", e);
+      return;
+    }
+
+    assertLiteralResult(result);
+    assertNowResult(session.execute("SELECT now()"));
+
+    PreparedStatement prepared = session.prepare("SELECT 1");
+    assertLiteralResult(session.execute(prepared.bind()));
+
+    prepared = session.prepare("SELECT now()");
+    assertNowResult(session.execute(prepared.bind()));
+  }
+
+  private static void assertLiteralResult(ResultSet result) {
+    Row row = result.one();
+    assertThat(row).isNotNull();
+    ColumnDefinitions definitions = result.getColumnDefinitions();
+    assertThat(definitions).hasSize(1);
+    assertThat(definitions.get(0).getName().asInternal()).isEqualTo("1");
+    assertThat(definitions.get(0).getType()).isEqualTo(DataTypes.INT);
+    assertThat(row.getInt(0)).isEqualTo(1);
+  }
+
+  private static void assertNowResult(ResultSet result) {
+    Row row = result.one();
+    assertThat(row).isNotNull();
+    ColumnDefinitions definitions = result.getColumnDefinitions();
+    assertThat(definitions).hasSize(1);
+    assertThat(definitions.get(0).getName().asInternal()).isEqualTo("now()");
+    assertThat(definitions.get(0).getType()).isEqualTo(DataTypes.TIMEUUID);
+    assertThat(row.getUuid(0)).isNotNull();
+  }
+}