Github user yijieshen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6981#discussion_r33344535
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetime.scala
---
@@ -0,0 +1,375 @@
+/*
+ * 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.sql.Date
+import java.text.SimpleDateFormat
+
+import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
+import
org.apache.spark.sql.catalyst.expressions.codegen.{GeneratedExpressionCode,
CodeGenContext}
+import org.apache.spark.sql.catalyst.util.DateTimeUtils
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+
+abstract class DateFormatExpression extends Expression { self: Product =>
+
+ protected val date: Expression
+
+ protected val format: Expression
+
+ override def foldable: Boolean = date.foldable && format.foldable
+
+ override def nullable: Boolean = true
+
+ override def children: Seq[Expression] = Seq(date, format)
+
+ override def eval(input: InternalRow): Any = {
+ val valueLeft = date.eval(input)
+ if (valueLeft == null) {
+ null
+ } else {
+ val valueRight = format.eval(input)
+ if (valueRight == null) {
+ null
+ } else {
+ val sdf = new
SimpleDateFormat(valueRight.asInstanceOf[UTF8String].toString)
+ date.dataType match {
+ case TimestampType =>
+ UTF8String.fromString(sdf.format(new
Date(valueLeft.asInstanceOf[Long] / 10000)))
+ case DateType =>
+
UTF8String.fromString(sdf.format(DateTimeUtils.toJavaDate(valueLeft.asInstanceOf[Int])))
+ case StringType =>
+ UTF8String.fromString(
+
sdf.format(DateTimeUtils.stringToTime(valueLeft.asInstanceOf[UTF8String].toString)))
+ }
+ }
+ }
+ }
+
+ /**
+ * Called by date format expressions to generate a code block that
returns the result
+ *
+ * As an example, the following parse the result to int
+ * {{{
+ * defineCodeGen(ctx, ev, c => s"Integer.parseInt($c.toString())")
+ * }}}
+ *
+ * @param f function that accepts a variable name and returns Java code
to parse an
+ * [[UTF8String]] to the expected output type
+ */
+
+ protected def defineCodeGen(
+ ctx: CodeGenContext,
+ ev: GeneratedExpressionCode,
+ f: String => String): String = {
+
+ val sdf = "java.text.SimpleDateFormat"
+ val utf8 = "org.apache.spark.unsafe.types.UTF8String"
+ val dtUtils = "org.apache.spark.sql.catalyst.util.DateTimeUtils"
+
+ val eval1 = date.gen(ctx)
+ val eval2 = format.gen(ctx)
+
+ val varName = ctx.freshName("resultVar")
+
+ s"""
+ ${eval1.code}
+ boolean ${ev.isNull} = ${eval1.isNull};
+ ${ctx.javaType(dataType)} ${ev.primitive} =
${ctx.defaultValue(dataType)};
+ if (!${ev.isNull}) {
+ ${eval2.code}
+ if (!${eval2.isNull}) {
+ $sdf sdf = new $sdf(${eval2.primitive}.toString());
+ Object o = ${eval1.primitive};
+ $utf8 $varName;
+ if (o instanceof ${ctx.boxedType(TimestampType)}) {
--- End diff --
Can we move the branching code out and get a specific version during code
generation, for performance sake?
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