add multi file

tensnsorflow/multi.py

@@ -12,7 +12,7 @@ def test():
     spark = SparkSession.builder.enableHiveSupport().getOrCreate()
     ti = pti.TiContext(spark)
     ti.tidbMapDatabase("jerry_test")
-    validate_date = spark.sql("select max(stat_date) from esmm_train_data").rdd.map(lambda x:str(x[0]))
+    validate_date = spark.sql("select max(stat_date) from esmm_train_data").rdd.map(lambda x:str(x[0])).collect()[0]
     print("validate_date:" + validate_date)
     temp = datetime.datetime.strptime(validate_date, "%Y-%m-%d")
     start = (temp - datetime.timedelta(days=10)).strftime("%Y-%m-%d")