PySpark

Question

给定一个数据框：

+---+-----------+---------+-------+------------+
| id|      score|tx_amount|isValid|    greeting|
+---+-----------+---------+-------+------------+
|  1|        0.2|    23.78|   true| hello_world|
|  2|        0.6|    12.41|  false|byebye_world|
+---+-----------+---------+-------+------------+

我想将这些列分解成一个名为 "col_value" 的行。这部分很好，但我还想对每一行应用逻辑，以便得到如下结果：

+---+------------+--------+---------+----------+-------+
| id|   col_value|is_score|is_amount|is_boolean|is_text|
+---+------------+--------+---------+----------+-------+
|  1|         0.2|       Y|        N|         N|      N|
|  1|       23.78|       N|        Y|         N|      N|
|  1|        true|       N|        N|         Y|      N|
|  1| hello_world|       N|        N|         N|      Y|
|  2|         0.6|       Y|        N|         N|      N|
|  2|       12.41|       N|        Y|         N|      N|
|  2|       false|       N|        N|         Y|      N|
|  2|byebye_world|       N|        N|         N|      Y|
+---+------------+--------+---------+----------+-------+

我目前拥有的：

.withColumn("cols", F.explode(F.arrays_zip(F.array("score", "tx_amount", "isValid", "greeting")))) \
        .select("id", F.col("cols.*")) \
        .withColumnRenamed("0", "col_value") \
        .withColumn("is_score", F.lit("Y") if col1_type == "score" else F.lit("N")) \
        .withColumn("is_amount", F.lit("Y") if col2_type == "amount" else F.lit("N")) \
        .withColumn("is_boolean", F.lit("Y") if col3_type == "boolean" else F.lit("N")) \
        .withColumn("is_text", F.lit("Y") if col4_type == "text" else F.lit("N")) \
        .show()

但它给出了错误的输出，因为它对每一列给出了相同的结果：

+---+------------+--------+---------+----------+-------+
| id|   col_value|is_score|is_amount|is_boolean|is_text|
+---+------------+--------+---------+----------+-------+
|  1|         0.2|       Y|        Y|         Y|      Y|
|  1|       23.78|       Y|        Y|         Y|      Y|
|  1|        true|       Y|        Y|         Y|      Y|
|  1| hello_world|       Y|        Y|         Y|      Y|
|  2|         0.6|       Y|        Y|         Y|      Y|
|  2|       12.41|       Y|        Y|         Y|      Y|
|  2|       false|       Y|        Y|         Y|      Y|
|  2|byebye_world|       Y|        Y|         Y|      Y|
+---+------------+--------+---------+----------+-------+

爆炸后如何才能得到正确的结果？

Answer 1

我想你想要的可以通过在你的col_value上应用regex来确定它是否是text,boolean,amount or score来实现。只要 score 不超过 1.0 并且 amount 总是 高于 1.0，下面的代码就可以工作。如果不是这种情况，请告诉我我会更新逻辑。

from pyspark.sql import functions as F
df.withColumn("cols", F.explode(F.arrays_zip(F.array("score", "tx_amount", "isValid", "greeting")))) \
        .select("id", F.col("cols.*")) \
        .withColumnRenamed("0", "col_value")\
        .withColumn("text", (F.regexp_extract(F.col("col_value"),"([A-Za-z]+)",1)))\
        .withColumn("boolean", F.when((F.col("text")=='true')|(F.col("text")=='false'),F.col("text")).otherwise(F.lit("")))\
        .withColumn("text", F.when(F.col("text")==F.col("boolean"), F.lit("")).otherwise(F.col("text")))\
        .withColumn("numeric", F.regexp_extract(F.col("col_value"),"([0-9]+)",1))\
        .withColumn("is_text", F.when(F.col("text")!="", F.lit("Y")).otherwise(F.lit("N")))\
        .withColumn("is_score", F.when(F.col("numeric")<=1, F.lit("Y")).otherwise(F.lit("N")))\
        .withColumn("is_amount", F.when(F.col("numeric")>1, F.lit("Y")).otherwise(F.lit("N")))\
        .withColumn("is_boolean", F.when(F.col("boolean")!="", F.lit("Y")).otherwise(F.lit("N")))\
        .select("id", "col_value","is_score","is_amount","is_boolean","is_text").show()


+---+------------+--------+---------+----------+-------+
| id|   col_value|is_score|is_amount|is_boolean|is_text|
+---+------------+--------+---------+----------+-------+
|  1|         0.2|       Y|        N|         N|      N|
|  1|       23.78|       N|        Y|         N|      N|
|  1|        true|       N|        N|         Y|      N|
|  1| hello_world|       N|        N|         N|      Y|
|  2|         0.6|       Y|        N|         N|      N|
|  2|       12.41|       N|        Y|         N|      N|
|  2|       false|       N|        N|         Y|      N|
|  2|byebye_world|       N|        N|         N|      Y|
+---+------------+--------+---------+----------+-------+

PySpark - 将列分解为行并根据逻辑设置值

PySpark - Explode columns into rows and set values based on logic

python

apache-spark

explode