Fix: Add missing placeholder for TABLE_NAME in MariaDB table existence check

Signed-off-by: vker <6492178@gmail.com>

Author: 91wangmeng

vector-stores/spring-ai-mariadb-store/src/main/java/org/springframework/ai/vectorstore/mariadb/MariaDBSchemaValidator.java

@@ -45,7 +45,8 @@ public MariaDBSchemaValidator(JdbcTemplate jdbcTemplate) {
 
 	private boolean isTableExists(String schemaName, String tableName) {
 		// schema and table are expected to be escaped
-		String sql = String.format("SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = %s AND TABLE_NAME = ",
+		String sql = String.format(
+				"SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s",
 				(schemaName == null) ? "SCHEMA()" : schemaName, tableName);
 		try {
 			// Query for a single integer value, if it exists, table exists