[SPARK-49954][SQL] Codegen Support for SchemaOfJson (by Invoke & Runt…

…imeReplaceable)

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

@@ -32,11 +32,11 @@ import org.apache.spark.sql.internal.types.{AbstractMapType, StringTypeWithCaseA
 import org.apache.spark.sql.types.{DataType, MapType, StringType, StructType, VariantType}
 import org.apache.spark.unsafe.types.UTF8String
 
-object ExprUtils extends QueryErrorsBase {
+object ExprUtils extends EvalHelper with QueryErrorsBase {
 
   def evalTypeExpr(exp: Expression): DataType = {
     if (exp.foldable) {
-      exp.eval() match {
+      prepareForEval(exp).eval() match {
         case s: UTF8String if s != null =>
           val dataType = DataType.parseTypeWithFallback(
             s.toString,

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/json/JsonExpressionEvalUtils.scala

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.sql.catalyst.expressions.json
+
+import com.fasterxml.jackson.core.JsonFactory
+
+import org.apache.spark.sql.catalyst.json.{CreateJacksonParser, JsonInferSchema, JSONOptions}
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.types.{ArrayType, DataType, StructType}
+import org.apache.spark.unsafe.types.UTF8String
+import org.apache.spark.util.Utils
+
+object JsonExpressionEvalUtils {
+
+  def schemaOfJson(
+      jsonFactory: JsonFactory,
+      jsonOptions: JSONOptions,
+      jsonInferSchema: JsonInferSchema,
+      json: UTF8String): UTF8String = {
+    val dt = Utils.tryWithResource(CreateJacksonParser.utf8String(jsonFactory, json)) { parser =>
+      parser.nextToken()
+      // To match with schema inference from JSON datasource.
+      jsonInferSchema.inferField(parser) match {
+        case st: StructType =>
+          jsonInferSchema.canonicalizeType(st, jsonOptions).getOrElse(StructType(Nil))
+        case at: ArrayType if at.elementType.isInstanceOf[StructType] =>
+          jsonInferSchema
+            .canonicalizeType(at.elementType, jsonOptions)
+            .map(ArrayType(_, containsNull = at.containsNull))
+            .getOrElse(ArrayType(StructType(Nil), containsNull = at.containsNull))
+        case other: DataType =>
+          jsonInferSchema.canonicalizeType(other, jsonOptions).getOrElse(
+            SQLConf.get.defaultStringType)
+      }
+    }
+
+    UTF8String.fromString(dt.sql)
+  }
+}

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

@@ -30,7 +30,7 @@ import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
 import org.apache.spark.sql.catalyst.analysis.TypeCheckResult.DataTypeMismatch
 import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext, CodeGenerator, CodegenFallback, ExprCode}
 import org.apache.spark.sql.catalyst.expressions.codegen.Block.BlockHelper
-import org.apache.spark.sql.catalyst.expressions.json.JsonExpressionUtils
+import org.apache.spark.sql.catalyst.expressions.json.{JsonExpressionEvalUtils, JsonExpressionUtils}
 import org.apache.spark.sql.catalyst.expressions.objects.StaticInvoke
 import org.apache.spark.sql.catalyst.expressions.variant.VariantExpressionEvalUtils
 import org.apache.spark.sql.catalyst.json._
@@ -878,7 +878,9 @@ case class StructsToJson(
 case class SchemaOfJson(
     child: Expression,
     options: Map[String, String])
-  extends UnaryExpression with CodegenFallback with QueryErrorsBase {
+  extends UnaryExpression
+  with RuntimeReplaceable
+  with QueryErrorsBase {
 
   def this(child: Expression) = this(child, Map.empty[String, String])
 
@@ -919,26 +921,20 @@ case class SchemaOfJson(
     }
   }
 
-  override def eval(v: InternalRow): Any = {
-    val dt = Utils.tryWithResource(CreateJacksonParser.utf8String(jsonFactory, json)) { parser =>
-      parser.nextToken()
-      // To match with schema inference from JSON datasource.
-      jsonInferSchema.inferField(parser) match {
-        case st: StructType =>
-          jsonInferSchema.canonicalizeType(st, jsonOptions).getOrElse(StructType(Nil))
-        case at: ArrayType if at.elementType.isInstanceOf[StructType] =>
-          jsonInferSchema
-            .canonicalizeType(at.elementType, jsonOptions)
-            .map(ArrayType(_, containsNull = at.containsNull))
-            .getOrElse(ArrayType(StructType(Nil), containsNull = at.containsNull))
-        case other: DataType =>
-          jsonInferSchema.canonicalizeType(other, jsonOptions).getOrElse(
-            SQLConf.get.defaultStringType)
-      }
-    }
+  @transient private lazy val jsonFactoryObjectType = ObjectType(classOf[JsonFactory])
+  @transient private lazy val jsonOptionsObjectType = ObjectType(classOf[JSONOptions])
+  @transient private lazy val jsonInferSchemaObjectType = ObjectType(classOf[JsonInferSchema])
 
-    UTF8String.fromString(dt.sql)
-  }
+  override def replacement: Expression = StaticInvoke(
+    JsonExpressionEvalUtils.getClass,
+    dataType,
+    "schemaOfJson",
+    Seq(Literal(jsonFactory, jsonFactoryObjectType),
+      Literal(jsonOptions, jsonOptionsObjectType),
+      Literal(jsonInferSchema, jsonInferSchemaObjectType),
+      child),
+    Seq(jsonFactoryObjectType, jsonOptionsObjectType, jsonInferSchemaObjectType, child.dataType)
+  )
 
   override def prettyName: String = "schema_of_json"
 

sql/connect/common/src/test/resources/query-tests/explain-results/function_schema_of_json.explain

@@ -1,2 +1,2 @@
-Project [schema_of_json([{"col":01}]) AS schema_of_json([{"col":01}])#0]
+Project [static_invoke(JsonExpressionEvalUtils.schemaOfJson(com.fasterxml.jackson.core.JsonFactory, org.apache.spark.sql.catalyst.json.JSONOptions, org.apache.spark.sql.catalyst.json.JsonInferSchema, [{"col":01}])) AS schema_of_json([{"col":01}])#0]
 +- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]

sql/connect/common/src/test/resources/query-tests/explain-results/function_schema_of_json_with_options.explain

@@ -1,2 +1,2 @@
-Project [schema_of_json([{"col":01}], (allowNumericLeadingZeros,true)) AS schema_of_json([{"col":01}])#0]
+Project [static_invoke(JsonExpressionEvalUtils.schemaOfJson(com.fasterxml.jackson.core.JsonFactory, org.apache.spark.sql.catalyst.json.JSONOptions, org.apache.spark.sql.catalyst.json.JsonInferSchema, [{"col":01}])) AS schema_of_json([{"col":01}])#0]
 +- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]