full out join例子:
df_1.join(df_2,
df_1("uid") === df_2("u_id"),
"full"
).show
df_1.join(df_2,
df_1("uid") === df_2("u_id"),
"full"
).show
2019-09-18
df.withColumn("op_phone",concat(lit("广州",col("op_phone").show
2019-09-18