Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7893#discussion_r36212442
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -97,32 +101,68 @@ case class Not(child: Expression)
/**
* Evaluates to `true` if `list` contains `value`.
*/
-case class In(value: Expression, list: Seq[Expression]) extends Predicate
with CodegenFallback {
+case class In(value: Expression, list: Seq[Expression]) extends Predicate {
override def children: Seq[Expression] = value +: list
- override def nullable: Boolean = true // TODO: Figure out correct
nullability semantics of IN.
+ override def nullable: Boolean = false // TODO: Figure out correct
nullability semantics of IN.
override def toString: String = s"$value IN ${list.mkString("(", ",",
")")}"
override def eval(input: InternalRow): Any = {
val evaluatedValue = value.eval(input)
list.exists(e => e.eval(input) == evaluatedValue)
}
-}
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val valueGen = value.gen(ctx)
+ val listGen = list.map(_.gen(ctx))
+ val listCode = listGen.map(x =>
+ s"""
+ if (!${ev.primitive}) {
+ ${x.code}
+ if (${ctx.genEqual(value.dataType, valueGen.primitive,
x.primitive)}) {
+ ${ev.primitive} = true;
+ }
+ }
+ """).foldLeft("")((a, b) => a + "\n" + b)
--- End diff --
We usually use `mkString("\n")`
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