[英]spark scala: add a new column that has a list as a value; the list should verify a specific condition
I have the query bellow:我有以下查询:
finvResultOutput1
.withColumn("offersAtSite",when(col("activeIOsAtSite")==="Y",
finvResultOutput1.select(col("OfferSpecification_displayLabel"),col("Site_siteId").alias("siteid"))
.where(col("Site_siteId")===col("siteid"))
.drop("siteid")
.collect()
))
I want to add a new column to my data frame called offersAtSite
, this column should be added when another column called activeIOsAtSite
equals "Y"
.我想在我的数据框中添加一个名为
offersAtSite
的新列,当另一个名为activeIOsAtSite
列等于"Y"
时,应该添加此列。
The value of this new column should be a list without duplicates of the elements of column OfferSpecification_displayLabel
where the Site_siteId
equals the current Site_siteId
of the row we are iterating over.这个新列的值应该是一个列表,没有重复列
OfferSpecification_displayLabel
的元素,其中Site_siteId
等于我们正在迭代的行的当前Site_siteId
。
Could anyone give me a better approach to do that, because the query that I made is taking too much time and I don't know if it is working谁能给我一个更好的方法来做到这一点,因为我所做的查询花费了太多时间,我不知道它是否有效
Bellow is an example of what I want to achieve:贝娄是我想要实现的一个例子:
First, you can groupBy
then collect_set
(set does not contain duplicates) on your main table:首先,您可以在主表上进行
groupBy
然后collect_set
(集合不包含重复项):
val grouped = df.groupBy("Site_siteId").agg(collect_set("OfferSpecifications_displayLabel").as("offerAtSite"))
We get:我们得到:
+-----------+------------------------+
|Site_siteId|offerAtSite |
+-----------+------------------------+
|site_id_3 |[site3_DL_1, site3_DL_2]|
|site_id_4 |[site4_DL_1] |
|site_id_2 |[site2_DL_1] |
|site_id_1 |[site1_DL_1, site1_DL_2]|
+-----------+------------------------+
Then, we join our df
table with grouped
and overwrite offerAtSite
to only have values for Y
value:然后,我们将我们的
df
表加入grouped
并覆盖offerAtSite
以仅具有Y
值的值:
df.join(grouped, Seq("Site_siteId"), "left")
.withColumn("offerAtSite", when(col("activeIOsAtSite").equalTo("Y"), col("offerAtSite")))
Final result:最后结果:
+-----------+---------------+--------------------------------+------------------------+
|Site_siteId|activeIOsAtSite|OfferSpecifications_displayLabel|offerAtSite |
+-----------+---------------+--------------------------------+------------------------+
|site_id_3 |Y |site3_DL_1 |[site3_DL_1, site3_DL_2]|
|site_id_3 |Y |site3_DL_2 |[site3_DL_1, site3_DL_2]|
|site_id_4 |N |site4_DL_1 |null |
|site_id_2 |N |site2_DL_1 |null |
|site_id_1 |Y |site1_DL_1 |[site1_DL_1, site1_DL_2]|
|site_id_1 |Y |site1_DL_2 |[site1_DL_1, site1_DL_2]|
+-----------+---------------+--------------------------------+------------------------+
This should work better, good luck!这应该会更好,祝你好运!
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