Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19169#discussion_r146420815
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CurrentUser.scala
---
@@ -0,0 +1,47 @@
+/*
+ * 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
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
+import org.apache.spark.sql.types.{DataType, StringType}
+
+/**
+ * Return the user executing the current query.
+ *
+ * There is no code generation since this expression should get constant
folded by the optimizer.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_() - Returns the current user executing the query.
+ """,
+ since = "2.3.0")
+case class CurrentUser() extends LeafExpression with CodegenFallback {
+ override def foldable: Boolean = true
+ override def nullable: Boolean = false
+ override def dataType: DataType = StringType
+
+ /** Returns the result of evaluating this expression on a given input
Row */
+ override def eval(input: InternalRow): Any = {
+ SparkContext.getActive.map(_.sparkUser).getOrElse("")
--- End diff --
So far, it is not in our plan.
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