Wei Zheng created SPARK-48666:
---------------------------------
Summary: A filter should not be pushed down if it contains
Unevaluable expression
Key: SPARK-48666
URL: https://issues.apache.org/jira/browse/SPARK-48666
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 4.0.0
Reporter: Wei Zheng
We should avoid pushing down Unevaluable expression as it can cause unexpected
failures. For example, the code snippet below
{code:java}
from pyspark import SparkConf
from pyspark.sql import SparkSession
from pyspark.sql.types import StringType
import pyspark.sql.functions as f
def getdata(p: str) -> str:
return "data"
NEW_COLUMN = 'new_column'
P_COLUMN = 'p'
f_getdata = f.udf(getdata, StringType())
rows = spark.sql("select * from default.P132474031")
table = rows.withColumn(NEW_COLUMN, f_getdata(f.col(P_COLUMN)))
df = table.alias('t1').join(table.alias('t2'), (f.col(f"t1.{NEW_COLUMN}") ==
f.col(f"t2.{NEW_COLUMN}")), how='inner')
df.show(){code}
will cause an error like:
{code:java}
org.apache.spark.SparkException: [INTERNAL_ERROR] Cannot evaluate expression:
getdata(input[0, string, true])#16
at org.apache.spark.SparkException$.internalError(SparkException.scala:92)
at org.apache.spark.SparkException$.internalError(SparkException.scala:96)
at
org.apache.spark.sql.errors.QueryExecutionErrors$.cannotEvaluateExpressionError(QueryExecutionErrors.scala:66)
at
org.apache.spark.sql.catalyst.expressions.Unevaluable.eval(Expression.scala:391)
at
org.apache.spark.sql.catalyst.expressions.Unevaluable.eval$(Expression.scala:390)
at
org.apache.spark.sql.catalyst.expressions.PythonUDF.eval(PythonUDF.scala:71)
at
org.apache.spark.sql.catalyst.expressions.IsNotNull.eval(nullExpressions.scala:384)
at
org.apache.spark.sql.catalyst.expressions.InterpretedPredicate.eval(predicates.scala:52)
at
org.apache.spark.sql.catalyst.catalog.ExternalCatalogUtils$.$anonfun$prunePartitionsByFilter$1(ExternalCatalogUtils.scala:166)
at
org.apache.spark.sql.catalyst.catalog.ExternalCatalogUtils$.$anonfun$prunePartitionsByFilter$1$adapted(ExternalCatalogUtils.scala:165)
{code}
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