log10
Calcule le logarithme de la valeur donnée en base 10. Prend en charge Spark Connect.
Pour la fonction Databricks SQL correspondante, consultez la fonctionlog10.
Syntaxe
Python
from pyspark.sql import functions as dbf
dbf.log10(col=<col>)
parameter
parameter | Type | Description |
|---|---|---|
|
| colonne pour calculer le logarithme. |
Renvoie
pyspark.sql.Column: logarithme de la valeur donnée en base 10.
Exemples
Python
from pyspark.sql import functions as dbf
df = spark.createDataFrame([(1,), (10,), (100,)], ["value"])
df.select("*", dbf.log10(df.value)).show()
Output
+-----+------------+
|value|LOG10(value)|
+-----+------------+
| 1| 0.0|
| 10| 1.0|
| 100| 2.0|
+-----+------------+
Python
from pyspark.sql import functions as dbf
spark.sql("SELECT * FROM VALUES (-1), (0), (FLOAT('NAN')), (NULL) AS TAB(value)").select("*", dbf.log10("value")).show()
Output
+-----+------------+
|value|LOG10(value)|
+-----+------------+
| -1.0| NULL|
| 0.0| NULL|
| NaN| NaN|
| NULL| NULL|
+-----+------------+