[SPARK-15285][SQL] Generated SpecificSafeProjection.apply method grows beyond 64 KB

## What changes were proposed in this pull request?

This PR splits the generated code for ```SafeProjection.apply``` by using ```ctx.splitExpressions()```. This is because the large code body for ```NewInstance``` may grow beyond 64KB bytecode size for ```apply()``` method.

## How was this patch tested?

Added new tests

Author: Kazuaki Ishizaki <ishizaki@jp.ibm.com>

Closes #13243 from kiszk/SPARK-15285.

Author: kiszk

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala

@@ -232,27 +232,47 @@ case class NewInstance(
 
   override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
     val javaType = ctx.javaType(dataType)
-    val argGen = arguments.map(_.genCode(ctx))
-    val argString = argGen.map(_.value).mkString(", ")
+    val argIsNulls = ctx.freshName("argIsNulls")
+    ctx.addMutableState("boolean[]", argIsNulls,
+      s"$argIsNulls = new boolean[${arguments.size}];")
+    val argValues = arguments.zipWithIndex.map { case (e, i) =>
+      val argValue = ctx.freshName("argValue")
+      ctx.addMutableState(ctx.javaType(e.dataType), argValue, "")
+      argValue
+    }
+
+    val argCodes = arguments.zipWithIndex.map { case (e, i) =>
+      val expr = e.genCode(ctx)
+      expr.code + s"""
+       $argIsNulls[$i] = ${expr.isNull};
+       ${argValues(i)} = ${expr.value};
+     """
+    }
+    val argCode = ctx.splitExpressions(ctx.INPUT_ROW, argCodes)
 
     val outer = outerPointer.map(func => Literal.fromObject(func()).genCode(ctx))
 
     var isNull = ev.isNull
     val setIsNull = if (propagateNull && arguments.nonEmpty) {
-      s"final boolean $isNull = ${argGen.map(_.isNull).mkString(" || ")};"
+      s"""
+       boolean $isNull = false;
+       for (int idx = 0; idx < ${arguments.length}; idx++) {
+         if ($argIsNulls[idx]) { $isNull = true; break; }
+       }
+      """
     } else {
       isNull = "false"
       ""
     }
 
     val constructorCall = outer.map { gen =>
-      s"""${gen.value}.new ${cls.getSimpleName}($argString)"""
+      s"""${gen.value}.new ${cls.getSimpleName}(${argValues.mkString(", ")})"""
     }.getOrElse {
-      s"new $className($argString)"
+      s"new $className(${argValues.mkString(", ")})"
     }
 
     val code = s"""
-      ${argGen.map(_.code).mkString("\n")}
+      $argCode
       ${outer.map(_.code).getOrElse("")}
       $setIsNull
       final $javaType ${ev.value} = $isNull ? ${ctx.defaultValue(javaType)} : $constructorCall;

sql/core/src/test/scala/org/apache/spark/sql/DataFrameComplexTypeSuite.scala

@@ -58,4 +58,39 @@ class DataFrameComplexTypeSuite extends QueryTest with SharedSQLContext {
     val nullIntRow = df.selectExpr("i[1]").collect()(0)
     assert(nullIntRow == org.apache.spark.sql.Row(null))
   }
+
+  test("SPARK-15285 Generated SpecificSafeProjection.apply method grows beyond 64KB") {
+    val ds100_5 = Seq(S100_5()).toDS()
+    ds100_5.rdd.count
+  }
 }
+
+case class S100(
+  s1: String = "1", s2: String = "2", s3: String = "3", s4: String = "4",
+  s5: String = "5", s6: String = "6", s7: String = "7", s8: String = "8",
+  s9: String = "9", s10: String = "10", s11: String = "11", s12: String = "12",
+  s13: String = "13", s14: String = "14", s15: String = "15", s16: String = "16",
+  s17: String = "17", s18: String = "18", s19: String = "19", s20: String = "20",
+  s21: String = "21", s22: String = "22", s23: String = "23", s24: String = "24",
+  s25: String = "25", s26: String = "26", s27: String = "27", s28: String = "28",
+  s29: String = "29", s30: String = "30", s31: String = "31", s32: String = "32",
+  s33: String = "33", s34: String = "34", s35: String = "35", s36: String = "36",
+  s37: String = "37", s38: String = "38", s39: String = "39", s40: String = "40",
+  s41: String = "41", s42: String = "42", s43: String = "43", s44: String = "44",
+  s45: String = "45", s46: String = "46", s47: String = "47", s48: String = "48",
+  s49: String = "49", s50: String = "50", s51: String = "51", s52: String = "52",
+  s53: String = "53", s54: String = "54", s55: String = "55", s56: String = "56",
+  s57: String = "57", s58: String = "58", s59: String = "59", s60: String = "60",
+  s61: String = "61", s62: String = "62", s63: String = "63", s64: String = "64",
+  s65: String = "65", s66: String = "66", s67: String = "67", s68: String = "68",
+  s69: String = "69", s70: String = "70", s71: String = "71", s72: String = "72",
+  s73: String = "73", s74: String = "74", s75: String = "75", s76: String = "76",
+  s77: String = "77", s78: String = "78", s79: String = "79", s80: String = "80",
+  s81: String = "81", s82: String = "82", s83: String = "83", s84: String = "84",
+  s85: String = "85", s86: String = "86", s87: String = "87", s88: String = "88",
+  s89: String = "89", s90: String = "90", s91: String = "91", s92: String = "92",
+  s93: String = "93", s94: String = "94", s95: String = "95", s96: String = "96",
+  s97: String = "97", s98: String = "98", s99: String = "99", s100: String = "100")
+
+case class S100_5(
+  s1: S100 = S100(), s2: S100 = S100(), s3: S100 = S100(), s4: S100 = S100(), s5: S100 = S100())