python: fix generated table name in dataframe creation (#1078)

QP Hou · jimexist · commit fa43a80ae1c3 · 2021-12-31T10:13:41.000+08:00
GitOrigin-RevId: 91a677c074e968be21fa4ef304de4b918dbb5a92
diff --git a/src/context.rs b/src/context.rs
@@ -83,8 +83,9 @@ impl ExecutionContext {
             errors::wrap(MemTable::try_new(partitions[0][0].schema(), partitions))?;
 
         // generate a random (unique) name for this table
-        let name = rand::thread_rng()
-            .sample_iter(&Alphanumeric)
+        // table name cannot start with numeric digit
+        let name = std::iter::once('c')
+            .chain(rand::thread_rng().sample_iter(&Alphanumeric))
             .take(10)
             .collect::<String>();
 
