From 5ad7538300ce7a15e0262846d89c0d274ed2db6c Mon Sep 17 00:00:00 2001
From: Liang-Chi Hsieh <viirya@gmail.com>
Date: Fri, 13 Sep 2019 09:03:03 -0700
Subject: [PATCH] Fix compilation error when input set is empty.

---
 .../sql/catalyst/expressions/predicates.scala  | 18 +++++++++++++-----
 .../catalyst/expressions/PredicateSuite.scala  |  6 ++++++
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
index 7ce113120e4c6..4c0998412f729 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
@@ -457,17 +457,25 @@ case class InSet(child: Expression, hset: Set[Any]) extends UnaryExpression with
           break;
        """)
 
+    val switchCode = if (caseBranches.size > 0) {
+      code"""
+        switch (${valueGen.value}) {
+          ${caseBranches.mkString("\n")}
+          default:
+            ${ev.isNull} = $hasNull;
+        }
+       """
+    } else {
+      s"${ev.isNull} = $hasNull;"
+    }
+
     ev.copy(code =
       code"""
         ${valueGen.code}
         ${CodeGenerator.JAVA_BOOLEAN} ${ev.isNull} = ${valueGen.isNull};
         ${CodeGenerator.JAVA_BOOLEAN} ${ev.value} = false;
         if (!${valueGen.isNull}) {
-          switch (${valueGen.value}) {
-            ${caseBranches.mkString("\n")}
-            default:
-              ${ev.isNull} = $hasNull;
-          }
+          $switchCode
         }
        """)
   }
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
index 7bff277c793ea..b05e49ea33015 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
@@ -560,4 +560,10 @@ class PredicateSuite extends SparkFunSuite with ExpressionEvalHelper {
         assert(msg.contains("argument 1 requires boolean type"))
     }
   }
+
+  test("SPARK-29100: InSet with empty input set") {
+    val row = create_row(1)
+    val inSet = InSet(BoundReference(0, IntegerType, true), Set.empty)
+    checkEvaluation(inSet, false, row)
+  }
 }