sandip-db commented on code in PR #45445:
URL: https://github.com/apache/spark/pull/45445#discussion_r1529478176


##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/XmlExpressionsSuite.scala:
##########
@@ -0,0 +1,463 @@
+/*
+ * 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 java.text.{DecimalFormat, DecimalFormatSymbols, SimpleDateFormat}
+import java.util.{Calendar, Locale, TimeZone}
+
+import org.scalatest.exceptions.TestFailedException
+
+import org.apache.spark.{SparkException, SparkFunSuite}
+import org.apache.spark.sql.{AnalysisException, Row}
+import org.apache.spark.sql.catalyst.InternalRow
+import 
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection
+import org.apache.spark.sql.catalyst.plans.PlanTestBase
+import org.apache.spark.sql.catalyst.util._
+import org.apache.spark.sql.catalyst.util.DateTimeTestUtils.{PST, UTC, UTC_OPT}
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+
+class XmlExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper with 
PlanTestBase {
+  test("from_xml escaping") {
+    val schema = StructType(StructField("\"quote", IntegerType) :: Nil)
+    GenerateUnsafeProjection.generate(
+      XmlToStructs(schema, Map.empty, Literal("\"quote"), UTC_OPT) :: Nil)
+  }
+
+  test("from_xml") {
+    val xmlData = """<row><a>1</a></row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(1)
+    )
+  }
+
+  test("from_xml- invalid data") {
+    val xmlData = """<row><a>1</row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(null)
+    )
+
+    val exception = intercept[TestFailedException] {
+      checkEvaluation(
+        XmlToStructs(schema, Map("mode" -> FailFastMode.name), 
Literal(xmlData), UTC_OPT),
+        InternalRow(null)
+      )
+    }.getCause
+    checkError(
+      exception = exception.asInstanceOf[SparkException],
+      errorClass = "MALFORMED_RECORD_IN_PARSING.WITHOUT_SUGGESTION",
+      parameters = Map("badRecord" -> "[null]", "failFastMode" -> "FAILFAST")
+    )
+  }
+
+  test("from_xml - input=array, schema=array, output=row of array") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1, 2))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=single element, schema=array, output=array of single 
element") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty row, schema=array, output=empty") {
+    val input = "<row> </row>"
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty, schema=array, output=empty") {
+    val input = """<?xml version="1.0"?>"""
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=array, schema=struct, output=single row") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val corrupted = "corrupted"
+    val schema = new StructType().add("a", IntegerType).add(corrupted, 
StringType)
+    val output = InternalRow(2, null)
+    val options = Map("columnNameOfCorruptRecord" -> corrupted)
+    checkEvaluation(XmlToStructs(schema, options, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty array, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty object, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(JsonToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml null input column") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(null, StringType), 
UTC_OPT),
+      null
+    )
+  }
+
+  test("from_xml with timestamp") {
+    val schema = StructType(StructField("t", TimestampType) :: Nil)
+    val xmlData1 = s"""
+                     |<row>
+                     |  <t>2016-01-01T00:00:00.123Z</t>
+                     |</row>""".stripMargin
+    var c = Calendar.getInstance(TimeZone.getTimeZone(UTC))
+    c.set(2016, 0, 1, 0, 0, 0)
+    c.set(Calendar.MILLISECOND, 123)
+
+
+    // The result doesn't change because the xml string includes timezone 
string ("Z" here),
+    // which means the string represents the timestamp string in the timezone 
regardless of
+    // the timeZoneId parameter.
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(xmlData1, StringType), 
UTC_OPT),
+      InternalRow(c.getTimeInMillis * 1000L)
+    )
+
+    val xmlData2 = s"""
+                     |<row>
+                     |  <t>2016-01-01T00:00:00</t>
+                     |</row>""".stripMargin
+    for (zid <- DateTimeTestUtils.outstandingZoneIds) {
+      c = Calendar.getInstance(TimeZone.getTimeZone(zid))
+      c.set(2016, 0, 1, 0, 0, 0)
+      c.set(Calendar.MILLISECOND, 0)
+
+      checkEvaluation(
+        XmlToStructs(
+          schema,
+          Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss"),
+          Literal.create(xmlData2, StringType),
+          Option(zid.getId)),
+        InternalRow(c.getTimeInMillis * 1000L)
+      )
+      checkEvaluation(
+        XmlToStructs(
+          schema,
+          Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss",
+            DateTimeUtils.TIMEZONE_OPTION -> zid.getId),
+          Literal.create(xmlData2, StringType),
+          UTC_OPT),
+        InternalRow(c.getTimeInMillis * 1000L)
+      )
+    }
+  }
+
+  test("from_xml empty input column") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(" ", StringType), 
UTC_OPT),
+      InternalRow(null)
+    )
+  }
+
+  test("to_xml escaping") {
+    val schema = StructType(StructField("\"quote", IntegerType) :: Nil)
+    val struct = Literal.create(create_row(1), schema)
+    GenerateUnsafeProjection.generate(
+      StructsToXml(Map.empty, struct, UTC_OPT) :: Nil)
+  }
+
+  test("to_xml - struct") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val struct = Literal.create(create_row(1), schema)
+    checkEvaluation(
+      StructsToXml(Map.empty, struct, UTC_OPT),
+      s"""|<ROW>
+          |    <a>1</a>
+          |</ROW>""".stripMargin
+    )
+  }
+
+  test("to_xml - array") {
+    val inputSchema = StructType(StructField("a", ArrayType(IntegerType)) :: 
Nil)
+    val input = Row(Array(1, 2))
+    val output = s"""|<ROW>
+                     |    <a>1</a>
+                     |    <a>2</a>
+                     |</ROW>""".stripMargin
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("to_xml - row with empty array") {
+    val inputSchema = StructType(StructField("a", ArrayType(IntegerType)) :: 
Nil)
+    val input = Row(Array(null))
+    val output = """<ROW/>""" // yhosny: self closing empty row?

Review Comment:
   ```suggestion
       val output = """<ROW/>"""
   ```



##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/XmlExpressionsSuite.scala:
##########
@@ -0,0 +1,463 @@
+/*
+ * 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 java.text.{DecimalFormat, DecimalFormatSymbols, SimpleDateFormat}
+import java.util.{Calendar, Locale, TimeZone}
+
+import org.scalatest.exceptions.TestFailedException
+
+import org.apache.spark.{SparkException, SparkFunSuite}
+import org.apache.spark.sql.{AnalysisException, Row}
+import org.apache.spark.sql.catalyst.InternalRow
+import 
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection
+import org.apache.spark.sql.catalyst.plans.PlanTestBase
+import org.apache.spark.sql.catalyst.util._
+import org.apache.spark.sql.catalyst.util.DateTimeTestUtils.{PST, UTC, UTC_OPT}
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+
+class XmlExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper with 
PlanTestBase {
+  test("from_xml escaping") {
+    val schema = StructType(StructField("\"quote", IntegerType) :: Nil)
+    GenerateUnsafeProjection.generate(
+      XmlToStructs(schema, Map.empty, Literal("\"quote"), UTC_OPT) :: Nil)
+  }
+
+  test("from_xml") {
+    val xmlData = """<row><a>1</a></row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(1)
+    )
+  }
+
+  test("from_xml- invalid data") {
+    val xmlData = """<row><a>1</row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(null)
+    )
+
+    val exception = intercept[TestFailedException] {
+      checkEvaluation(
+        XmlToStructs(schema, Map("mode" -> FailFastMode.name), 
Literal(xmlData), UTC_OPT),
+        InternalRow(null)
+      )
+    }.getCause
+    checkError(
+      exception = exception.asInstanceOf[SparkException],
+      errorClass = "MALFORMED_RECORD_IN_PARSING.WITHOUT_SUGGESTION",
+      parameters = Map("badRecord" -> "[null]", "failFastMode" -> "FAILFAST")
+    )
+  }
+
+  test("from_xml - input=array, schema=array, output=row of array") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1, 2))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=single element, schema=array, output=array of single 
element") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty row, schema=array, output=empty") {
+    val input = "<row> </row>"
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty, schema=array, output=empty") {
+    val input = """<?xml version="1.0"?>"""
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=array, schema=struct, output=single row") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val corrupted = "corrupted"
+    val schema = new StructType().add("a", IntegerType).add(corrupted, 
StringType)
+    val output = InternalRow(2, null)
+    val options = Map("columnNameOfCorruptRecord" -> corrupted)
+    checkEvaluation(XmlToStructs(schema, options, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty array, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty object, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(JsonToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)

Review Comment:
   ```suggestion
       checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), 
UTC_OPT), output)
   ```



##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/XmlExpressionsSuite.scala:
##########
@@ -0,0 +1,463 @@
+/*
+ * 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 java.text.{DecimalFormat, DecimalFormatSymbols, SimpleDateFormat}
+import java.util.{Calendar, Locale, TimeZone}
+
+import org.scalatest.exceptions.TestFailedException
+
+import org.apache.spark.{SparkException, SparkFunSuite}
+import org.apache.spark.sql.{AnalysisException, Row}
+import org.apache.spark.sql.catalyst.InternalRow
+import 
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection
+import org.apache.spark.sql.catalyst.plans.PlanTestBase
+import org.apache.spark.sql.catalyst.util._
+import org.apache.spark.sql.catalyst.util.DateTimeTestUtils.{PST, UTC, UTC_OPT}
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+
+class XmlExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper with 
PlanTestBase {
+  test("from_xml escaping") {
+    val schema = StructType(StructField("\"quote", IntegerType) :: Nil)
+    GenerateUnsafeProjection.generate(
+      XmlToStructs(schema, Map.empty, Literal("\"quote"), UTC_OPT) :: Nil)
+  }
+
+  test("from_xml") {
+    val xmlData = """<row><a>1</a></row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(1)
+    )
+  }
+
+  test("from_xml- invalid data") {
+    val xmlData = """<row><a>1</row>"""
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal(xmlData), UTC_OPT),
+      InternalRow(null)
+    )
+
+    val exception = intercept[TestFailedException] {
+      checkEvaluation(
+        XmlToStructs(schema, Map("mode" -> FailFastMode.name), 
Literal(xmlData), UTC_OPT),
+        InternalRow(null)
+      )
+    }.getCause
+    checkError(
+      exception = exception.asInstanceOf[SparkException],
+      errorClass = "MALFORMED_RECORD_IN_PARSING.WITHOUT_SUGGESTION",
+      parameters = Map("badRecord" -> "[null]", "failFastMode" -> "FAILFAST")
+    )
+  }
+
+  test("from_xml - input=array, schema=array, output=row of array") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1, 2))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=single element, schema=array, output=array of single 
element") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(Array(1))
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty row, schema=array, output=empty") {
+    val input = "<row> </row>"
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty, schema=array, output=empty") {
+    val input = """<?xml version="1.0"?>"""
+    val schema = StructType(StructField("a", ArrayType(IntegerType)) :: Nil)
+    val output = Row(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=array, schema=struct, output=single row") {
+    val input = s"""
+            |<row>
+            |   <a>1</a>
+            |   <a>2</a>
+            |</row>""".stripMargin
+    val corrupted = "corrupted"
+    val schema = new StructType().add("a", IntegerType).add(corrupted, 
StringType)
+    val output = InternalRow(2, null)
+    val options = Map("columnNameOfCorruptRecord" -> corrupted)
+    checkEvaluation(XmlToStructs(schema, options, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty array, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(XmlToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml - input=empty object, schema=struct, output=single row with 
null") {
+    val input = s"""
+            |<row>
+            |   <a></a>
+            |   <a></a>
+            |</row>""".stripMargin
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val output = InternalRow(null)
+    checkEvaluation(JsonToStructs(schema, Map.empty, Literal(input), UTC_OPT), 
output)
+  }
+
+  test("from_xml null input column") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(null, StringType), 
UTC_OPT),
+      null
+    )
+  }
+
+  test("from_xml with timestamp") {
+    val schema = StructType(StructField("t", TimestampType) :: Nil)
+    val xmlData1 = s"""
+                     |<row>
+                     |  <t>2016-01-01T00:00:00.123Z</t>
+                     |</row>""".stripMargin
+    var c = Calendar.getInstance(TimeZone.getTimeZone(UTC))
+    c.set(2016, 0, 1, 0, 0, 0)
+    c.set(Calendar.MILLISECOND, 123)
+
+
+    // The result doesn't change because the xml string includes timezone 
string ("Z" here),
+    // which means the string represents the timestamp string in the timezone 
regardless of
+    // the timeZoneId parameter.
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(xmlData1, StringType), 
UTC_OPT),
+      InternalRow(c.getTimeInMillis * 1000L)
+    )
+
+    val xmlData2 = s"""
+                     |<row>
+                     |  <t>2016-01-01T00:00:00</t>
+                     |</row>""".stripMargin
+    for (zid <- DateTimeTestUtils.outstandingZoneIds) {
+      c = Calendar.getInstance(TimeZone.getTimeZone(zid))
+      c.set(2016, 0, 1, 0, 0, 0)
+      c.set(Calendar.MILLISECOND, 0)
+
+      checkEvaluation(
+        XmlToStructs(
+          schema,
+          Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss"),
+          Literal.create(xmlData2, StringType),
+          Option(zid.getId)),
+        InternalRow(c.getTimeInMillis * 1000L)
+      )
+      checkEvaluation(
+        XmlToStructs(
+          schema,
+          Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss",
+            DateTimeUtils.TIMEZONE_OPTION -> zid.getId),
+          Literal.create(xmlData2, StringType),
+          UTC_OPT),
+        InternalRow(c.getTimeInMillis * 1000L)
+      )
+    }
+  }
+
+  test("from_xml empty input column") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    checkEvaluation(
+      XmlToStructs(schema, Map.empty, Literal.create(" ", StringType), 
UTC_OPT),
+      InternalRow(null)
+    )
+  }
+
+  test("to_xml escaping") {
+    val schema = StructType(StructField("\"quote", IntegerType) :: Nil)
+    val struct = Literal.create(create_row(1), schema)
+    GenerateUnsafeProjection.generate(
+      StructsToXml(Map.empty, struct, UTC_OPT) :: Nil)
+  }
+
+  test("to_xml - struct") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val struct = Literal.create(create_row(1), schema)
+    checkEvaluation(
+      StructsToXml(Map.empty, struct, UTC_OPT),
+      s"""|<ROW>
+          |    <a>1</a>
+          |</ROW>""".stripMargin
+    )
+  }
+
+  test("to_xml - array") {
+    val inputSchema = StructType(StructField("a", ArrayType(IntegerType)) :: 
Nil)
+    val input = Row(Array(1, 2))
+    val output = s"""|<ROW>
+                     |    <a>1</a>
+                     |    <a>2</a>
+                     |</ROW>""".stripMargin
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("to_xml - row with empty array") {
+    val inputSchema = StructType(StructField("a", ArrayType(IntegerType)) :: 
Nil)
+    val input = Row(Array(null))
+    val output = """<ROW/>""" // yhosny: self closing empty row?
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("to_xml - empty row") {
+    val inputSchema = StructType(StructField("a", ArrayType(IntegerType)) :: 
Nil)
+    val input = Row(null)
+    val output = """<ROW/>"""
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("to_xml null input column") {
+    val schema = StructType(StructField("a", IntegerType) :: Nil)
+    val struct = Literal.create(null, schema)
+    checkEvaluation(
+      StructsToXml(Map.empty, struct, UTC_OPT),
+      null
+    )
+  }
+
+  test("to_xml with timestamp") {
+    val schema = StructType(StructField("t", TimestampType) :: Nil)
+    val c = Calendar.getInstance(TimeZone.getTimeZone(UTC))
+    c.set(2016, 0, 1, 0, 0, 0)
+    c.set(Calendar.MILLISECOND, 0)
+    val struct = Literal.create(create_row(c.getTimeInMillis * 1000L), schema)
+
+    checkEvaluation(
+      StructsToXml(Map.empty, struct, UTC_OPT),
+      s"""|<ROW>
+          |    <t>2016-01-01T00:00:00.000Z</t>
+          |</ROW>""".stripMargin
+    )
+    checkEvaluation(
+      StructsToXml(Map.empty, struct, Option(PST.getId)),
+      s"""|<ROW>
+          |    <t>2015-12-31T16:00:00.000-08:00</t>
+          |</ROW>""".stripMargin
+    )
+
+    checkEvaluation(
+      StructsToXml(
+        Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss",
+          DateTimeUtils.TIMEZONE_OPTION -> UTC_OPT.get),
+        struct,
+        UTC_OPT),
+        s"""|<ROW>
+            |    <t>2016-01-01T00:00:00</t>
+            |</ROW>""".stripMargin
+    )
+    checkEvaluation(
+      StructsToXml(
+        Map("timestampFormat" -> "yyyy-MM-dd'T'HH:mm:ss",
+          DateTimeUtils.TIMEZONE_OPTION -> PST.getId),
+        struct,
+        UTC_OPT),
+        s"""|<ROW>
+            |    <t>2015-12-31T16:00:00</t>
+            |</ROW>""".stripMargin
+    )
+  }
+
+  test("to_xml - row with array of maps") {
+    val inputSchema = StructType(
+      StructField("f", ArrayType(MapType(StringType, IntegerType))) :: Nil)
+    val input = Row(Array(Map("a" -> 1), Map("a" -> 2)))
+    val output = s"""|<ROW>
+                     |    <f>
+                     |        <a>1</a>
+                     |    </f>
+                     |    <f>
+                     |        <a>2</a>
+                     |    </f>
+                     |</ROW>""".stripMargin
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("to_xml - row with single map") {
+    val inputSchema = StructType(StructField("f", MapType(StringType, 
IntegerType)) :: Nil)
+    val input = Row(Map("a" -> 1))
+    val output = s"""|<ROW>
+                     |    <f>
+                     |        <a>1</a>
+                     |    </f>
+                     |</ROW>""".stripMargin
+    checkEvaluation(
+      StructsToXml(Map.empty, Literal.create(input, inputSchema), UTC_OPT),
+      output)
+  }
+
+  test("from/to xml - interval support") {

Review Comment:
   remove this test as CalendarIntervalType is not supported yet.



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