Maxim Gekk created SPARK-31563:
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Summary: Failure of InSet.sql for UTF8String collection
Key: SPARK-31563
URL: https://issues.apache.org/jira/browse/SPARK-31563
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.5, 3.0.0, 3.1.0
Reporter: Maxim Gekk
The InSet expression works on collections of internal Catalyst's types. We can
see this in the optimization when In is replaced by InSet, and In's collection
is evaluated to internal Catalyst's values:
[https://github.com/apache/spark/blob/branch-2.4/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala#L253-L254]
{code:scala}
if (newList.length > SQLConf.get.optimizerInSetConversionThreshold) {
val hSet = newList.map(e => e.eval(EmptyRow))
InSet(v, HashSet() ++ hSet)
}
{code}
The code existed before the optimization
https://github.com/apache/spark/pull/25754 that made another wrong assumption
about collection types.
If InSet accepts only internal Catalyst's types, the following code shouldn't
fail:
{code:scala}
InSet(Literal("a"), Set("a", "b").map(UTF8String.fromString)).sql
{code}
but it fails with the exception:
{code}
Unsupported literal type class org.apache.spark.unsafe.types.UTF8String a
java.lang.RuntimeException: Unsupported literal type class
org.apache.spark.unsafe.types.UTF8String a
at
org.apache.spark.sql.catalyst.expressions.Literal$.apply(literals.scala:88)
at
org.apache.spark.sql.catalyst.expressions.InSet.$anonfun$sql$2(predicates.scala:522)
{code}
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