SPRKSCL1134

org.apache.spark.sql.functions.log

Message: org.apache.spark.sql.functions.log has a workaround, see documentation for more info

Category: Warning

Description

This issue appears when the SMA detects a use of the org.apache.spark.sql.functions.log function, which has a workaround.

Scenario

Input

Below is an example of the org.apache.spark.sql.functions.log function that generates this EWI.

val df = Seq(10.0, 20.0, 30.0, 40.0).toDF("value")
val result1 = df.withColumn("log_value", log(10, "value"))
val result2 = df.withColumn("log_value", log(10, col("value")))
val result3 = df.withColumn("log_value", log("value"))
val result4 = df.withColumn("log_value", log(col("value")))

Output

The SMA adds the EWI SPRKSCL1134 to the output code to let you know that this function is not fully supported by Snowpark, but it has a workaround.

val df = Seq(10.0, 20.0, 30.0, 40.0).toDF("value")
/*EWI: SPRKSCL1134 => org.apache.spark.sql.functions.log has a workaround, see documentation for more info*/
val result1 = df.withColumn("log_value", log(10, "value"))
/*EWI: SPRKSCL1134 => org.apache.spark.sql.functions.log has a workaround, see documentation for more info*/
val result2 = df.withColumn("log_value", log(10, col("value")))
/*EWI: SPRKSCL1134 => org.apache.spark.sql.functions.log has a workaround, see documentation for more info*/
val result3 = df.withColumn("log_value", log("value"))
/*EWI: SPRKSCL1134 => org.apache.spark.sql.functions.log has a workaround, see documentation for more info*/
val result4 = df.withColumn("log_value", log(col("value")))

Recommended fix

Below are the different workarounds for all the overloads of the log function.

1. def log(base: Double, columnName: String): Column

You can convert the base into a column object using the com.snowflake.snowpark.functions.lit function and convert the column name into a column object using the com.snowflake.snowpark.functions.col function.

val result1 = df.withColumn("log_value", log(lit(10), col("value")))

2. def log(base: Double, a: Column): Column

You can convert the base into a column object using the com.snowflake.snowpark.functions.lit function.

val result2 = df.withColumn("log_value", log(lit(10), col("value")))

3.def log(columnName: String): Column

You can pass lit(Math.E) as the first argument and convert the column name into a column object using the com.snowflake.snowpark.functions.col function and pass it as the second argument.

val result3 = df.withColumn("log_value", log(lit(Math.E), col("value")))

4. def log(e: Column): Column

You can pass lit(Math.E) as the first argument and the column object as the second argument.

val result4 = df.withColumn("log_value", log(lit(Math.E), col("value")))

Additional recommendations

• For more support, you can email us at [email protected] or post an issue in the SMA.