ulysses-you commented on code in PR #5796:
URL: https://github.com/apache/incubator-gluten/pull/5796#discussion_r1606478172
##########
gluten-core/src/main/scala/org/apache/gluten/expression/ExpressionTransformer.scala:
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@@ -16,17 +16,74 @@
*/
package org.apache.gluten.expression
-import org.apache.gluten.substrait.expression.ExpressionNode
+import org.apache.gluten.substrait.expression.{ExpressionBuilder,
ExpressionNode}
-import org.apache.spark.sql.catalyst.expressions.Expression
+import org.apache.spark.sql.catalyst.expressions.{Expression, Literal}
import org.apache.spark.sql.types.DataType
-trait ExpressionTransformer {
- def doTransform(args: java.lang.Object): ExpressionNode
- def dataType: DataType
-}
+import scala.collection.JavaConverters._
+
+// ==== Expression transformer basic interface start ====
-trait ExpressionTransformerWithOrigin extends ExpressionTransformer {
+trait ExpressionTransformer {
+ def substraitExprName: String
+ def children: Seq[ExpressionTransformer]
def original: Expression
def dataType: DataType = original.dataType
+ def nullable: Boolean = original.nullable
+
+ def doTransform(args: java.lang.Object): ExpressionNode = {
+ val functionMap = args.asInstanceOf[java.util.HashMap[String,
java.lang.Long]]
+ // TODO: the funcName seems can be simplified to `substraitExprName`
+ val funcName: String =
+ ConverterUtils.makeFuncName(substraitExprName,
original.children.map(_.dataType))
+ val functionId = ExpressionBuilder.newScalarFunction(functionMap, funcName)
+ val childNodes = children.map(_.doTransform(args)).asJava
+ val typeNode = ConverterUtils.getTypeNode(dataType, nullable)
+ ExpressionBuilder.makeScalarFunction(functionId, childNodes, typeNode)
+ }
+}
+
+trait LeafExpressionTransformer extends ExpressionTransformer {
+ final override def children: Seq[ExpressionTransformer] = Nil
+}
+
+trait UnaryExpressionTransformer extends ExpressionTransformer {
+ def child: ExpressionTransformer
+ final override def children: Seq[ExpressionTransformer] = child :: Nil
+}
+
+trait BinaryExpressionTransformer extends ExpressionTransformer {
+ def left: ExpressionTransformer
+ def right: ExpressionTransformer
+ final override def children: Seq[ExpressionTransformer] = left :: right ::
Nil
+}
+
+// ==== Expression transformer basic interface end ====
+
+case class GenericExpressionTransformer(
Review Comment:
Most expression can leverage this transformer rather than make a custom
expression. Take an example `MakeDecimal`, it is a unary expression in vanilla
Spark but native requires one more arg `nullOnOverflow`, then we can pass one
more child `LiteralTransformer` to `GenericExpressionTransformer`:
```scala
GenericExpressionTransformer(
substraitExprName,
Seq(
replaceWithExpressionTransformerInternal(m.child, attributeSeq,
expressionsMap),
LiteralTransformer(m.nullOnOverflow)),
m
)
```
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