diff --git ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java index 69a18cd..d38e12c 100644 --- ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java +++ ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java @@ -326,6 +326,7 @@ system.registerGenericUDF("current_date", GenericUDFCurrentDate.class); system.registerGenericUDF("current_timestamp", GenericUDFCurrentTimestamp.class); system.registerGenericUDF("current_user", GenericUDFCurrentUser.class); + system.registerGenericUDF("logged_in_user", GenericUDFLoggedInUser.class); system.registerGenericUDF("isnull", GenericUDFOPNull.class); system.registerGenericUDF("isnotnull", GenericUDFOPNotNull.class); diff --git ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLoggedInUser.java ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLoggedInUser.java new file mode 100644 index 0000000..2915b86 --- /dev/null +++ ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLoggedInUser.java @@ -0,0 +1,82 @@ +/** + * 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.hadoop.hive.ql.udf.generic; + +import org.apache.hadoop.hive.ql.exec.Description; +import org.apache.hadoop.hive.ql.exec.UDFArgumentException; +import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException; +import org.apache.hadoop.hive.ql.metadata.HiveException; +import org.apache.hadoop.hive.ql.session.SessionState; +import org.apache.hadoop.hive.ql.udf.UDFType; +import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; +import org.apache.hadoop.io.Text; + +@UDFType(deterministic = true) +@Description(name = "logged_in_user", value = "_FUNC_() - Returns logged in user name", + extended = "SessionState GetUserName - the username provided at session initialization") +@NDV(maxNdv = 1) +public class GenericUDFLoggedInUser extends GenericUDF { + protected Text loggedInUser; + + @Override + public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException { + if (arguments.length != 0) { + throw new UDFArgumentLengthException( + "The function LOGGED_IN_USER does not take any arguments, but found " + arguments.length); + } + + if (loggedInUser == null) { + String loggedInUserName = SessionState.get().getUserName(); + if (loggedInUserName != null) { + loggedInUser = new Text(loggedInUserName); + } + } + + return PrimitiveObjectInspectorFactory.writableStringObjectInspector; + } + + @Override + public Object evaluate(DeferredObject[] arguments) throws HiveException { + return loggedInUser; + } + + public Text getLoggedInUser() { + return loggedInUser; + } + + public void setLoggedInUser(Text loggedInUser) { + this.loggedInUser = loggedInUser; + } + + @Override + public String getDisplayString(String[] children) { + return "LOGGED_IN_USER()"; + } + + @Override + public void copyToNewInstance(Object newInstance) throws UDFArgumentException { + super.copyToNewInstance(newInstance); + // Need to preserve loggedInUser + GenericUDFLoggedInUser other = (GenericUDFLoggedInUser) newInstance; + if (this.loggedInUser != null) { + other.loggedInUser = new Text(this.loggedInUser); + } + } +} diff --git ql/src/test/queries/clientpositive/udf_logged_in_user.q ql/src/test/queries/clientpositive/udf_logged_in_user.q new file mode 100644 index 0000000..4814c72 --- /dev/null +++ ql/src/test/queries/clientpositive/udf_logged_in_user.q @@ -0,0 +1,5 @@ +DESCRIBE FUNCTION logged_in_user; +DESCRIBE FUNCTION EXTENDED logged_in_user; + +select logged_in_user() +FROM src tablesample (1 rows); diff --git ql/src/test/results/clientpositive/show_functions.q.out ql/src/test/results/clientpositive/show_functions.q.out index 68c24a6..9bb0991 100644 --- ql/src/test/results/clientpositive/show_functions.q.out +++ ql/src/test/results/clientpositive/show_functions.q.out @@ -122,6 +122,7 @@ locate log log10 log2 +logged_in_user lower lpad ltrim @@ -317,6 +318,7 @@ POSTHOOK: type: SHOWFUNCTIONS log log10 log2 +logged_in_user PREHOOK: query: SHOW FUNCTIONS '.*date.*' PREHOOK: type: SHOWFUNCTIONS POSTHOOK: query: SHOW FUNCTIONS '.*date.*' @@ -397,6 +399,7 @@ POSTHOOK: type: SHOWFUNCTIONS log log10 log2 +logged_in_user PREHOOK: query: SHOW FUNCTIONS LIKE "log*" PREHOOK: type: SHOWFUNCTIONS POSTHOOK: query: SHOW FUNCTIONS LIKE "log*" @@ -404,6 +407,7 @@ POSTHOOK: type: SHOWFUNCTIONS log log10 log2 +logged_in_user PREHOOK: query: SHOW FUNCTIONS LIKE `log*` PREHOOK: type: SHOWFUNCTIONS POSTHOOK: query: SHOW FUNCTIONS LIKE `log*` @@ -411,3 +415,4 @@ POSTHOOK: type: SHOWFUNCTIONS log log10 log2 +logged_in_user diff --git ql/src/test/results/clientpositive/udf_logged_in_user.q.out ql/src/test/results/clientpositive/udf_logged_in_user.q.out new file mode 100644 index 0000000..ffb19ca --- /dev/null +++ ql/src/test/results/clientpositive/udf_logged_in_user.q.out @@ -0,0 +1,22 @@ +PREHOOK: query: DESCRIBE FUNCTION logged_in_user +PREHOOK: type: DESCFUNCTION +POSTHOOK: query: DESCRIBE FUNCTION logged_in_user +POSTHOOK: type: DESCFUNCTION +logged_in_user() - Returns logged in user name +PREHOOK: query: DESCRIBE FUNCTION EXTENDED logged_in_user +PREHOOK: type: DESCFUNCTION +POSTHOOK: query: DESCRIBE FUNCTION EXTENDED logged_in_user +POSTHOOK: type: DESCFUNCTION +logged_in_user() - Returns logged in user name +SessionState GetUserName - the username provided at session initialization +PREHOOK: query: select logged_in_user() +FROM src tablesample (1 rows) +PREHOOK: type: QUERY +PREHOOK: Input: default@src +#### A masked pattern was here #### +POSTHOOK: query: select logged_in_user() +FROM src tablesample (1 rows) +POSTHOOK: type: QUERY +POSTHOOK: Input: default@src +#### A masked pattern was here #### +NULL