Github user tarekauel commented on a diff in the pull request: https://github.com/apache/spark/pull/6981#discussion_r33128876 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetime.scala --- @@ -0,0 +1,229 @@ +/* + * 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.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 + +case class DateFormat(left: Expression, right: Expression) + extends BinaryExpression with ExpectsInputTypes { + + override def dataType: DataType = StringType + + override def expectedChildTypes: Seq[DataType] = Seq(TimestampType, StringType) + + override def foldable: Boolean = left.foldable && right.foldable + + override def nullable: Boolean = true + + override def eval(input: InternalRow): Any = { + val valueLeft = left.eval(input) + if (valueLeft == null) { + null + } else { + val valueRight = right.eval(input) + if (valueRight == null) { + null + } else { + val sdf = new SimpleDateFormat(valueRight.asInstanceOf[UTF8String].toString) + left.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))) + } + } + } + } + + override def toString: String = s"DateFormat($left, $right)" + + override protected def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = { + val sdf = "java.text.SimpleDateFormat" + val utf8 = "org.apache.spark.unsafe.types.UTF8String" + val dtUtils = "org.apache.spark.sql.catalyst.util.DateTimeUtils" + + val eval1 = left.gen(ctx) + val eval2 = right.gen(ctx) + + val calc = left.dataType match { + case TimestampType => + s"""$utf8.fromString(sdf.format(new java.sql.Date(${eval1.primitive} / 10000)));""" + case DateType => + s"""$utf8.fromString( + sdf.format($dtUtils.toJavaDate(${eval1.primitive})));""" + case StringType => + s""" + $utf8.fromString(sdf.format(new java.sql.Date($dtUtils.stringToTime(${eval1.primitive}.toString()).getTime()))); + """ + } + + 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()); + ${ev.primitive} = $calc + } else { + ${ev.isNull} = true; + } + } + """ + } +} + +case class Year(child: Expression) extends UnaryExpression with ExpectsInputTypes { + + override def dataType: DataType = IntegerType + + override def expectedChildTypes: Seq[DataType] = Seq(DateType, StringType, TimestampType) + + override def foldable: Boolean = child.foldable + + override def nullable: Boolean = true + + override def eval(input: InternalRow): Any = { + DateFormat(child, Literal("y")).eval(input) match { --- End diff -- Is it okay to call `DateFormat(child, Literal("y")).eval(input)` or is there a more elegant way. Is there a way to call `genCode` of `DataFormat`?
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