ted-jenks commented on code in PR #45408:
URL: https://github.com/apache/spark/pull/45408#discussion_r1517931178


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala:
##########
@@ -2426,21 +2426,34 @@ case class Chr(child: Expression)
   """,
   since = "1.5.0",
   group = "string_funcs")
-case class Base64(child: Expression)
+case class Base64(child: Expression, chunkBase64: Boolean = 
SQLConf.get.base64Chunking)
   extends UnaryExpression with ImplicitCastInputTypes with NullIntolerant {
 
+  lazy val encoder: JBase64.Encoder = if (chunkBase64) {
+    JBase64.getMimeEncoder
+  } else {
+    JBase64.getMimeEncoder(-1, Array())
+  }
+
   override def dataType: DataType = StringType
   override def inputTypes: Seq[DataType] = Seq(BinaryType)
 
   protected override def nullSafeEval(bytes: Any): Any = {
-    
UTF8String.fromBytes(JBase64.getMimeEncoder.encode(bytes.asInstanceOf[Array[Byte]]))
+    UTF8String.fromBytes(encoder.encode(bytes.asInstanceOf[Array[Byte]]))
   }
 
   override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
     nullSafeCodeGen(ctx, ev, (child) => {
-      s"""${ev.value} = UTF8String.fromBytes(
-            ${classOf[JBase64].getName}.getMimeEncoder().encode($child));
-       """})
+      s"""
+        if ($chunkBase64) {

Review Comment:
   nice



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