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https://issues.apache.org/jira/browse/SPARK-24371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-24371:
------------------------------------
Assignee: DB Tsai (was: Apache Spark)
> Added isinSet in DataFrame API for Scala and Java.
> --------------------------------------------------
>
> Key: SPARK-24371
> URL: https://issues.apache.org/jira/browse/SPARK-24371
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: DB Tsai
> Assignee: DB Tsai
> Priority: Major
> Fix For: 2.4.0
>
>
> Implemented *{{isinSet}}* in DataFrame API for both Scala and Java, so users
> can do
> {code}
> val profileDF = Seq(
> Some(1), Some(2), Some(3), Some(4),
> Some(5), Some(6), Some(7), None
> ).toDF("profileID")
> val validUsers: Set[Any] = Set(6, 7.toShort, 8L, "3")
> val result = profileDF.withColumn("isValid", $"profileID".isinSet(validUsers))
> result.show(10)
> """
> +----------+------+
> |profileID|isValid|
> +----------+------+
> |1|false|
> |2|false|
> |3|true|
> |4|false|
> |5|false|
> |6|true|
> |7|true|
> |null|null|
> +----------+------+
> """.stripMargin
> {code}
> Two new rules in the logical plan optimizers are added.
> # When there is only one element in the *{{Set}}*, the physical plan will be
> optimized to *{{EqualTo}}*, so predicate pushdown can be used.
> {code}
> profileDF.filter( $"profileID".isinSet(Set(6))).explain(true)
> """
> |== Physical Plan ==|
> |*(1) Project [profileID#0|#0]|
> |+- *(1) Filter (isnotnull(profileID#0) && (profileID#0 = 6))|
> |+- *(1) FileScan parquet [profileID#0|#0] Batched: true, Format: Parquet,|
> |PartitionFilters: [],|
> |PushedFilters: [IsNotNull(profileID), EqualTo(profileID,6)],|
> |ReadSchema: struct<profileID:int>
> """.stripMargin
> {code}
> # When the *{{Set}}* is empty, and the input is nullable, the logical plan
> will be simplified to
> {code}
> profileDF.filter( $"profileID".isinSet(Set())).explain(true)
> """
> |== Optimized Logical Plan ==|
> |Filter if (isnull(profileID#0)) null else false|
> |+- Relation[profileID#0|#0] parquet
> """.stripMargin
> {code}
>
> TODO:
> # For multiple conditions with numbers less than certain thresholds, we
> should still allow predicate pushdown.
> # Optimize the `In` using tableswitch or lookupswitch when the numbers of
> the categories are low, and they are `Int`, `Long`.
> # The default immutable hash trees set is slow for query, and we should do
> benchmark for using different set implementation for faster query.
> # `filter(if (condition) null else false)` can be optimized to false.
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