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To support the OVER clause in SQL Signed-off-by: Andrew Coleman <[email protected]>
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spark/src/main/scala/io/substrait/spark/expression/ToWindowFunction.scala
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| /* | ||
| * 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 io.substrait.spark.expression | ||
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| import io.substrait.spark.expression.ToWindowFunction.fromSpark | ||
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| import org.apache.spark.sql.catalyst.expressions.{CurrentRow, Expression, FrameType, Literal, OffsetWindowFunction, RangeFrame, RowFrame, SpecifiedWindowFrame, UnboundedFollowing, UnboundedPreceding, UnspecifiedFrame, WindowExpression, WindowFrame, WindowSpecDefinition} | ||
| import org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression | ||
| import org.apache.spark.sql.types.{IntegerType, LongType} | ||
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| import io.substrait.`type`.Type | ||
| import io.substrait.expression.{Expression => SExpression, ExpressionCreator, FunctionArg, WindowBound} | ||
| import io.substrait.expression.Expression.WindowBoundsType | ||
| import io.substrait.expression.WindowBound.{CURRENT_ROW, UNBOUNDED, WindowBoundVisitor} | ||
| import io.substrait.extension.SimpleExtension | ||
| import io.substrait.relation.ConsistentPartitionWindow.WindowRelFunctionInvocation | ||
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| import scala.collection.JavaConverters | ||
|
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| abstract class ToWindowFunction(functions: Seq[SimpleExtension.WindowFunctionVariant]) | ||
| extends FunctionConverter[SimpleExtension.WindowFunctionVariant, WindowRelFunctionInvocation]( | ||
| functions) { | ||
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| override def generateBinding( | ||
| sparkExp: Expression, | ||
| function: SimpleExtension.WindowFunctionVariant, | ||
| arguments: Seq[FunctionArg], | ||
| outputType: Type): WindowRelFunctionInvocation = { | ||
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| val (frameType, lower, upper) = sparkExp match { | ||
| case WindowExpression(_: OffsetWindowFunction, _) => | ||
| (WindowBoundsType.ROWS, UNBOUNDED, CURRENT_ROW) | ||
| case WindowExpression( | ||
| _, | ||
| WindowSpecDefinition(_, _, SpecifiedWindowFrame(frameType, lower, upper))) => | ||
| (fromSpark(frameType), fromSpark(lower), fromSpark(upper)) | ||
| case WindowExpression(_, WindowSpecDefinition(_, orderSpec, UnspecifiedFrame)) => | ||
| if (orderSpec.isEmpty) { | ||
| (WindowBoundsType.ROWS, UNBOUNDED, UNBOUNDED) | ||
| } else { | ||
| (WindowBoundsType.RANGE, UNBOUNDED, CURRENT_ROW) | ||
| } | ||
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| case _ => throw new UnsupportedOperationException(s"Unsupported window expression: $sparkExp") | ||
| } | ||
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| ExpressionCreator.windowRelFunction( | ||
| function, | ||
| outputType, | ||
| SExpression.AggregationPhase.INITIAL_TO_RESULT, // use defaults... | ||
| SExpression.AggregationInvocation.ALL, // Spark doesn't define these | ||
| frameType, | ||
| lower, | ||
| upper, | ||
| JavaConverters.asJavaIterable(arguments) | ||
| ) | ||
| } | ||
|
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| def convert( | ||
| expression: WindowExpression, | ||
| operands: Seq[SExpression]): Option[WindowRelFunctionInvocation] = { | ||
| val cls = expression.windowFunction match { | ||
| case agg: AggregateExpression => agg.aggregateFunction.getClass | ||
| case other => other.getClass | ||
| } | ||
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| Option(signatures.get(cls)) | ||
| .flatMap(m => m.attemptMatch(expression, operands)) | ||
| } | ||
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| def apply( | ||
| expression: WindowExpression, | ||
| operands: Seq[SExpression]): WindowRelFunctionInvocation = { | ||
| convert(expression, operands).getOrElse(throw new UnsupportedOperationException( | ||
| s"Unable to find binding for call ${expression.windowFunction} -- $operands -- $expression")) | ||
| } | ||
| } | ||
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| object ToWindowFunction { | ||
| def fromSpark(frameType: FrameType): WindowBoundsType = frameType match { | ||
| case RowFrame => WindowBoundsType.ROWS | ||
| case RangeFrame => WindowBoundsType.RANGE | ||
| case other => throw new UnsupportedOperationException(s"Unsupported bounds type: $other.") | ||
| } | ||
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| def fromSpark(bound: Expression): WindowBound = bound match { | ||
| case UnboundedPreceding => WindowBound.UNBOUNDED | ||
| case UnboundedFollowing => WindowBound.UNBOUNDED | ||
| case CurrentRow => WindowBound.CURRENT_ROW | ||
| case e: Literal => | ||
| e.dataType match { | ||
| case IntegerType | LongType => | ||
| val offset = e.eval().asInstanceOf[Int] | ||
| if (offset < 0) WindowBound.Preceding.of(-offset) | ||
| else if (offset == 0) WindowBound.CURRENT_ROW | ||
| else WindowBound.Following.of(offset) | ||
| } | ||
| case _ => throw new UnsupportedOperationException(s"Unexpected bound: $bound") | ||
| } | ||
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| def toSparkFrame( | ||
| boundsType: WindowBoundsType, | ||
| lowerBound: WindowBound, | ||
| upperBound: WindowBound): WindowFrame = { | ||
| val frameType = boundsType match { | ||
| case WindowBoundsType.ROWS => RowFrame | ||
| case WindowBoundsType.RANGE => RangeFrame | ||
| case WindowBoundsType.UNSPECIFIED => return UnspecifiedFrame | ||
| } | ||
| SpecifiedWindowFrame( | ||
| frameType, | ||
| toSparkBound(lowerBound, isLower = true), | ||
| toSparkBound(upperBound, isLower = false)) | ||
| } | ||
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| private def toSparkBound(bound: WindowBound, isLower: Boolean): Expression = { | ||
| bound.accept(new WindowBoundVisitor[Expression, Exception] { | ||
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| override def visit(preceding: WindowBound.Preceding): Expression = | ||
| Literal(-preceding.offset().intValue()) | ||
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| override def visit(following: WindowBound.Following): Expression = | ||
| Literal(following.offset().intValue()) | ||
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| override def visit(currentRow: WindowBound.CurrentRow): Expression = CurrentRow | ||
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| override def visit(unbounded: WindowBound.Unbounded): Expression = | ||
| if (isLower) UnboundedPreceding else UnboundedFollowing | ||
| }) | ||
| } | ||
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| def apply(functions: Seq[SimpleExtension.WindowFunctionVariant]): ToWindowFunction = { | ||
| new ToWindowFunction(functions) { | ||
| override def getSigs: Seq[Sig] = | ||
| FunctionMappings.WINDOW_SIGS ++ FunctionMappings.AGGREGATE_SIGS | ||
| } | ||
| } | ||
|
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| } |
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