chore: Refactor serde for more array and struct expressions (apache#2257)

Author: andygrove

spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala

@@ -95,6 +95,8 @@ object QueryPlanSerde extends Logging with CometExprShim {
     classOf[ArraysOverlap] -> CometArraysOverlap,
     classOf[ArrayUnion] -> CometArrayUnion,
     classOf[CreateArray] -> CometCreateArray,
+    classOf[GetArrayItem] -> CometGetArrayItem,
+    classOf[ElementAt] -> CometElementAt,
     classOf[Ascii] -> CometScalarFunction("ascii"),
     classOf[ConcatWs] -> CometScalarFunction("concat_ws"),
     classOf[Chr] -> CometScalarFunction("char"),
@@ -170,6 +172,10 @@ object QueryPlanSerde extends Logging with CometExprShim {
     classOf[DateSub] -> CometDateSub,
     classOf[TruncDate] -> CometTruncDate,
     classOf[TruncTimestamp] -> CometTruncTimestamp,
+    classOf[CreateNamedStruct] -> CometCreateNamedStruct,
+    classOf[GetStructField] -> CometGetStructField,
+    classOf[GetArrayStructFields] -> CometGetArrayStructFields,
+    classOf[StructsToJson] -> CometStructsToJson,
     classOf[Flatten] -> CometFlatten,
     classOf[Atan2] -> CometAtan2,
     classOf[Ceil] -> CometCeil,
@@ -922,66 +928,6 @@ object QueryPlanSerde extends Logging with CometExprShim {
             None
         }
 
-      case StructsToJson(options, child, timezoneId) =>
-        if (options.nonEmpty) {
-          withInfo(expr, "StructsToJson with options is not supported")
-          None
-        } else {
-
-          def isSupportedType(dt: DataType): Boolean = {
-            dt match {
-              case StructType(fields) =>
-                fields.forall(f => isSupportedType(f.dataType))
-              case DataTypes.BooleanType | DataTypes.ByteType | DataTypes.ShortType |
-                  DataTypes.IntegerType | DataTypes.LongType | DataTypes.FloatType |
-                  DataTypes.DoubleType | DataTypes.StringType =>
-                true
-              case DataTypes.DateType | DataTypes.TimestampType =>
-                // TODO implement these types with tests for formatting options and timezone
-                false
-              case _: MapType | _: ArrayType =>
-                // Spark supports map and array in StructsToJson but this is not yet
-                // implemented in Comet
-                false
-              case _ => false
-            }
-          }
-
-          val isSupported = child.dataType match {
-            case s: StructType =>
-              s.fields.forall(f => isSupportedType(f.dataType))
-            case _: MapType | _: ArrayType =>
-              // Spark supports map and array in StructsToJson but this is not yet
-              // implemented in Comet
-              false
-            case _ =>
-              false
-          }
-
-          if (isSupported) {
-            exprToProtoInternal(child, inputs, binding) match {
-              case Some(p) =>
-                val toJson = ExprOuterClass.ToJson
-                  .newBuilder()
-                  .setChild(p)
-                  .setTimezone(timezoneId.getOrElse("UTC"))
-                  .setIgnoreNullFields(true)
-                  .build()
-                Some(
-                  ExprOuterClass.Expr
-                    .newBuilder()
-                    .setToJson(toJson)
-                    .build())
-              case _ =>
-                withInfo(expr, child)
-                None
-            }
-          } else {
-            withInfo(expr, "Unsupported data type", child)
-            None
-          }
-        }
-
       case SortOrder(child, direction, nullOrdering, _) =>
         val childExpr = exprToProtoInternal(child, inputs, binding)
 
@@ -1336,110 +1282,6 @@ object QueryPlanSerde extends Logging with CometExprShim {
           withInfo(expr, bloomFilter, value)
           None
         }
-
-      case struct @ CreateNamedStruct(_) =>
-        if (struct.names.length != struct.names.distinct.length) {
-          withInfo(expr, "CreateNamedStruct with duplicate field names are not supported")
-          return None
-        }
-
-        val valExprs = struct.valExprs.map(exprToProtoInternal(_, inputs, binding))
-
-        if (valExprs.forall(_.isDefined)) {
-          val structBuilder = ExprOuterClass.CreateNamedStruct.newBuilder()
-          structBuilder.addAllValues(valExprs.map(_.get).asJava)
-          structBuilder.addAllNames(struct.names.map(_.toString).asJava)
-
-          Some(
-            ExprOuterClass.Expr
-              .newBuilder()
-              .setCreateNamedStruct(structBuilder)
-              .build())
-        } else {
-          withInfo(expr, "unsupported arguments for CreateNamedStruct", struct.valExprs: _*)
-          None
-        }
-
-      case GetStructField(child, ordinal, _) =>
-        exprToProtoInternal(child, inputs, binding).map { childExpr =>
-          val getStructFieldBuilder = ExprOuterClass.GetStructField
-            .newBuilder()
-            .setChild(childExpr)
-            .setOrdinal(ordinal)
-
-          ExprOuterClass.Expr
-            .newBuilder()
-            .setGetStructField(getStructFieldBuilder)
-            .build()
-        }
-
-      case GetArrayItem(child, ordinal, failOnError) =>
-        val childExpr = exprToProtoInternal(child, inputs, binding)
-        val ordinalExpr = exprToProtoInternal(ordinal, inputs, binding)
-
-        if (childExpr.isDefined && ordinalExpr.isDefined) {
-          val listExtractBuilder = ExprOuterClass.ListExtract
-            .newBuilder()
-            .setChild(childExpr.get)
-            .setOrdinal(ordinalExpr.get)
-            .setOneBased(false)
-            .setFailOnError(failOnError)
-
-          Some(
-            ExprOuterClass.Expr
-              .newBuilder()
-              .setListExtract(listExtractBuilder)
-              .build())
-        } else {
-          withInfo(expr, "unsupported arguments for GetArrayItem", child, ordinal)
-          None
-        }
-
-      case ElementAt(child, ordinal, defaultValue, failOnError)
-          if child.dataType.isInstanceOf[ArrayType] =>
-        val childExpr = exprToProtoInternal(child, inputs, binding)
-        val ordinalExpr = exprToProtoInternal(ordinal, inputs, binding)
-        val defaultExpr = defaultValue.flatMap(exprToProtoInternal(_, inputs, binding))
-
-        if (childExpr.isDefined && ordinalExpr.isDefined &&
-          defaultExpr.isDefined == defaultValue.isDefined) {
-          val arrayExtractBuilder = ExprOuterClass.ListExtract
-            .newBuilder()
-            .setChild(childExpr.get)
-            .setOrdinal(ordinalExpr.get)
-            .setOneBased(true)
-            .setFailOnError(failOnError)
-
-          defaultExpr.foreach(arrayExtractBuilder.setDefaultValue(_))
-
-          Some(
-            ExprOuterClass.Expr
-              .newBuilder()
-              .setListExtract(arrayExtractBuilder)
-              .build())
-        } else {
-          withInfo(expr, "unsupported arguments for ElementAt", child, ordinal)
-          None
-        }
-
-      case GetArrayStructFields(child, _, ordinal, _, _) =>
-        val childExpr = exprToProtoInternal(child, inputs, binding)
-
-        if (childExpr.isDefined) {
-          val arrayStructFieldsBuilder = ExprOuterClass.GetArrayStructFields
-            .newBuilder()
-            .setChild(childExpr.get)
-            .setOrdinal(ordinal)
-
-          Some(
-            ExprOuterClass.Expr
-              .newBuilder()
-              .setGetArrayStructFields(arrayStructFieldsBuilder)
-              .build())
-        } else {
-          withInfo(expr, "unsupported arguments for GetArrayStructFields", child)
-          None
-        }
       case af @ ArrayFilter(_, func) if func.children.head.isInstanceOf[IsNotNull] =>
         convert(af, CometArrayCompact)
       case expr =>

spark/src/main/scala/org/apache/comet/serde/arrays.scala

@@ -21,7 +21,7 @@ package org.apache.comet.serde
 
 import scala.annotation.tailrec
 
-import org.apache.spark.sql.catalyst.expressions.{ArrayAppend, ArrayContains, ArrayDistinct, ArrayExcept, ArrayInsert, ArrayIntersect, ArrayJoin, ArrayMax, ArrayMin, ArrayRemove, ArrayRepeat, ArraysOverlap, ArrayUnion, Attribute, CreateArray, Expression, Flatten, Literal}
+import org.apache.spark.sql.catalyst.expressions.{ArrayAppend, ArrayContains, ArrayDistinct, ArrayExcept, ArrayInsert, ArrayIntersect, ArrayJoin, ArrayMax, ArrayMin, ArrayRemove, ArrayRepeat, ArraysOverlap, ArrayUnion, Attribute, CreateArray, ElementAt, Expression, Flatten, GetArrayItem, Literal}
 import org.apache.spark.sql.internal.SQLConf
 import org.apache.spark.sql.types._
 
@@ -404,6 +404,72 @@ object CometCreateArray extends CometExpressionSerde[CreateArray] {
   }
 }
 
+object CometGetArrayItem extends CometExpressionSerde[GetArrayItem] {
+  override def convert(
+      expr: GetArrayItem,
+      inputs: Seq[Attribute],
+      binding: Boolean): Option[ExprOuterClass.Expr] = {
+    val childExpr = exprToProtoInternal(expr.child, inputs, binding)
+    val ordinalExpr = exprToProtoInternal(expr.ordinal, inputs, binding)
+
+    if (childExpr.isDefined && ordinalExpr.isDefined) {
+      val listExtractBuilder = ExprOuterClass.ListExtract
+        .newBuilder()
+        .setChild(childExpr.get)
+        .setOrdinal(ordinalExpr.get)
+        .setOneBased(false)
+        .setFailOnError(expr.failOnError)
+
+      Some(
+        ExprOuterClass.Expr
+          .newBuilder()
+          .setListExtract(listExtractBuilder)
+          .build())
+    } else {
+      withInfo(expr, "unsupported arguments for GetArrayItem", expr.child, expr.ordinal)
+      None
+    }
+  }
+}
+
+object CometElementAt extends CometExpressionSerde[ElementAt] {
+
+  override def convert(
+      expr: ElementAt,
+      inputs: Seq[Attribute],
+      binding: Boolean): Option[ExprOuterClass.Expr] = {
+    val childExpr = exprToProtoInternal(expr.left, inputs, binding)
+    val ordinalExpr = exprToProtoInternal(expr.right, inputs, binding)
+    val defaultExpr = expr.defaultValueOutOfBound.flatMap(exprToProtoInternal(_, inputs, binding))
+
+    if (!expr.left.dataType.isInstanceOf[ArrayType]) {
+      withInfo(expr, "Input is not an array")
+      return None
+    }
+
+    if (childExpr.isDefined && ordinalExpr.isDefined &&
+      defaultExpr.isDefined == expr.defaultValueOutOfBound.isDefined) {
+      val arrayExtractBuilder = ExprOuterClass.ListExtract
+        .newBuilder()
+        .setChild(childExpr.get)
+        .setOrdinal(ordinalExpr.get)
+        .setOneBased(true)
+        .setFailOnError(expr.failOnError)
+
+      defaultExpr.foreach(arrayExtractBuilder.setDefaultValue(_))
+
+      Some(
+        ExprOuterClass.Expr
+          .newBuilder()
+          .setListExtract(arrayExtractBuilder)
+          .build())
+    } else {
+      withInfo(expr, "unsupported arguments for ElementAt", expr.left, expr.right)
+      None
+    }
+  }
+}
+
 object CometFlatten extends CometExpressionSerde[Flatten] with ArraysBase {
 
   override def convert(