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[FLINK-6075] [table] Add ORDER BY support for streaming table.
This closes #3889.
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114 changes: 114 additions & 0 deletions
114
...k-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/CommonSort.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. | ||
| */ | ||
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| package org.apache.flink.table.plan.nodes | ||
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| import org.apache.calcite.rex.{RexLiteral, RexNode} | ||
| import org.apache.calcite.rel.RelFieldCollation.Direction | ||
| import org.apache.calcite.rel.`type`._ | ||
| import scala.collection.JavaConverters._ | ||
| import org.apache.flink.api.common.operators.Order | ||
| import org.apache.calcite.rel.{RelWriter, RelCollation} | ||
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| /** | ||
| * Common methods for Flink sort operators. | ||
| */ | ||
| trait CommonSort { | ||
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| private def offsetToString(offset: RexNode): String = { | ||
| val offsetToString = s"$offset" | ||
| offsetToString | ||
| } | ||
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| private def sortFieldsToString( | ||
| collationSort: RelCollation, | ||
| rowRelDataType: RelDataType): String = { | ||
| val fieldCollations = collationSort.getFieldCollations.asScala | ||
| .map(c => (c.getFieldIndex, directionToOrder(c.getDirection))) | ||
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| fieldCollations | ||
| .map(col => s"${rowRelDataType.getFieldNames.get(col._1)} ${col._2.getShortName}" ) | ||
| .mkString(", ") | ||
| } | ||
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| private[flink] def directionToOrder(direction: Direction) = { | ||
| direction match { | ||
| case Direction.ASCENDING | Direction.STRICTLY_ASCENDING => Order.ASCENDING | ||
| case Direction.DESCENDING | Direction.STRICTLY_DESCENDING => Order.DESCENDING | ||
| case _ => throw new IllegalArgumentException("Unsupported direction.") | ||
| } | ||
| } | ||
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| private def fetchToString(fetch: RexNode, offset: RexNode): String = { | ||
| val limitEnd = getFetchLimitEnd(fetch, offset) | ||
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| if (limitEnd == Long.MaxValue) { | ||
| "unlimited" | ||
| } else { | ||
| s"$limitEnd" | ||
| } | ||
| } | ||
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| private[flink] def getFetchLimitEnd (fetch: RexNode, offset: RexNode): Long = { | ||
| if (fetch != null) { | ||
| RexLiteral.intValue(fetch) + getFetchLimitStart(offset) | ||
| } else { | ||
| Long.MaxValue | ||
| } | ||
| } | ||
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| private[flink] def getFetchLimitStart (offset: RexNode): Long = { | ||
| if (offset != null) { | ||
| RexLiteral.intValue(offset) | ||
| } else { | ||
| 0L | ||
| } | ||
| } | ||
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| private[flink] def sortToString( | ||
| rowRelDataType: RelDataType, | ||
| sortCollation: RelCollation, | ||
| sortOffset: RexNode, | ||
| sortFetch: RexNode): String = { | ||
| s"Sort(by: ($$sortFieldsToString(sortCollation, rowRelDataType))," + | ||
| (if (sortOffset != null) { | ||
| " offset: $offsetToString(sortOffset)," | ||
| } else { | ||
| "" | ||
| }) + | ||
| (if (sortFetch != null) { | ||
| " fetch: $fetchToString(sortFetch, sortOffset))" | ||
| } else { | ||
| "" | ||
| }) | ||
| } | ||
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| private[flink] def sortExplainTerms( | ||
| pw: RelWriter, | ||
| rowRelDataType: RelDataType, | ||
| sortCollation: RelCollation, | ||
| sortOffset: RexNode, | ||
| sortFetch: RexNode) : RelWriter = { | ||
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| pw | ||
| .item("orderBy", sortFieldsToString(sortCollation, rowRelDataType)) | ||
| .itemIf("offset", offsetToString(sortOffset), sortOffset != null) | ||
| .itemIf("fetch", fetchToString(sortFetch, sortOffset), sortFetch != null) | ||
| } | ||
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| } |
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