chore: add CALL keyword to list of query keywords (googleapis#4196)

Author: olavloite

google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/AbstractStatementParser.java

@@ -109,7 +109,7 @@ public static AbstractStatementParser getInstance(Dialect dialect) {
   static final Set<String> ddlStatements =
       ImmutableSet.of("CREATE", "DROP", "ALTER", "ANALYZE", "GRANT", "REVOKE", "RENAME");
   static final Set<String> selectStatements =
-      ImmutableSet.of("SELECT", "WITH", "SHOW", "FROM", "GRAPH");
+      ImmutableSet.of("SELECT", "WITH", "SHOW", "FROM", "GRAPH", "CALL");
   static final Set<String> SELECT_STATEMENTS_ALLOWING_PRECEDING_BRACKETS =
       ImmutableSet.of("SELECT", "FROM");
   static final Set<String> dmlStatements = ImmutableSet.of("INSERT", "UPDATE", "DELETE");

google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/CallTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed 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.google.cloud.spanner.connection;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import com.google.cloud.spanner.MockSpannerServiceImpl;
+import com.google.cloud.spanner.ResultSet;
+import com.google.cloud.spanner.Statement;
+import com.google.spanner.v1.ResultSetMetadata;
+import com.google.spanner.v1.StructType;
+import com.google.spanner.v1.StructType.Field;
+import com.google.spanner.v1.Type;
+import com.google.spanner.v1.TypeCode;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class CallTest extends AbstractMockServerTest {
+
+  @Test
+  public void testCancelQuery() {
+    // 'CALL' should be recognized as a valid query keyword.
+    Statement statement = Statement.of("call cancel_query('1234')");
+    mockSpanner.putStatementResult(
+        MockSpannerServiceImpl.StatementResult.query(
+            statement,
+            com.google.spanner.v1.ResultSet.newBuilder()
+                .setMetadata(
+                    ResultSetMetadata.newBuilder()
+                        .setRowType(
+                            StructType.newBuilder()
+                                .addFields(
+                                    Field.newBuilder()
+                                        .setName("call_result_tvf")
+                                        .setType(Type.newBuilder().setCode(TypeCode.BOOL).build())
+                                        .build())
+                                .build())
+                        .build())
+                .build()));
+
+    try (Connection connection = createConnection()) {
+      try (ResultSet resultSet = connection.executeQuery(statement)) {
+        assertFalse(resultSet.next());
+        assertEquals(1, resultSet.getColumnCount());
+      }
+    }
+  }
+}