| /* |
| * 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.flink.table.plan.metadata |
| |
| import org.apache.flink.table.plan.metadata.FlinkMetadata.ColumnOriginNullCount |
| import org.apache.flink.table.plan.nodes.logical.FlinkLogicalSnapshot |
| import org.apache.flink.table.plan.schema.FlinkRelOptTable |
| import org.apache.flink.util.Preconditions |
| |
| import org.apache.calcite.rel.RelNode |
| import org.apache.calcite.rel.core._ |
| import org.apache.calcite.rel.metadata._ |
| import org.apache.calcite.rex.{RexInputRef, RexLiteral, RexNode} |
| |
| import java.lang.{Double => JDouble} |
| import java.util |
| |
| import scala.collection.JavaConversions._ |
| |
| /** |
| * FlinkRelMdColumnOriginNullCount supplies a default implementation of |
| * [[FlinkRelMetadataQuery.getColumnOriginNullCount]] for the standard logical algebra. |
| * If there is null, then return the original stats. If there is no null, then return 0. |
| * If don't know, then return null. |
| */ |
| class FlinkRelMdColumnOriginNullCount private extends MetadataHandler[ColumnOriginNullCount] { |
| |
| override def getDef: MetadataDef[ColumnOriginNullCount] = FlinkMetadata.ColumnOriginNullCount.DEF |
| |
| def getColumnOriginNullCount(ts: TableScan, mq: RelMetadataQuery, index: Int): JDouble = { |
| Preconditions.checkArgument(mq.isInstanceOf[FlinkRelMetadataQuery]) |
| val relOptTable = ts.getTable.asInstanceOf[FlinkRelOptTable] |
| val fieldNames = relOptTable.getRowType.getFieldNames |
| Preconditions.checkArgument(index >= 0 && index < fieldNames.size()) |
| val fieldName = fieldNames.get(index) |
| val statistic = relOptTable.getFlinkStatistic |
| val colStats = statistic.getColumnStats(fieldName) |
| if (colStats != null && colStats.nullCount != null) colStats.nullCount.toDouble else null |
| } |
| |
| def getColumnOriginNullCount(project: Project, mq: RelMetadataQuery, index: Int): JDouble = { |
| getColumnOriginNullAfterProjects(project.getInput, project.getProjects, mq, index) |
| } |
| |
| def getColumnOriginNullCount(calc: Calc, mq: RelMetadataQuery, index: Int): JDouble = { |
| val program = calc.getProgram |
| if (program.getCondition == null) { |
| getColumnOriginNullAfterProjects( |
| calc.getInput, program.getProjectList.map(program.expandLocalRef), mq, index) |
| } else { |
| null |
| } |
| } |
| |
| def getColumnOriginNullCount( |
| snapshot: FlinkLogicalSnapshot, |
| mq: RelMetadataQuery, |
| index: Int): JDouble = null |
| |
| private def getColumnOriginNullAfterProjects( |
| input: RelNode, |
| projects: util.List[RexNode], |
| mq: RelMetadataQuery, |
| index: Int): JDouble = { |
| val fmq = FlinkRelMetadataQuery.reuseOrCreate(mq) |
| projects.get(index) match { |
| case inputRef: RexInputRef => fmq.getColumnNullCount(input, inputRef.getIndex) |
| case literal: RexLiteral => if (literal.isNull) 1D else 0D |
| case _ => null |
| } |
| } |
| |
| def getColumnOriginNullCount(rel: Join, mq: RelMetadataQuery, index: Int): JDouble = { |
| val fmq = FlinkRelMetadataQuery.reuseOrCreate(mq) |
| if (rel.getJoinType == JoinRelType.INNER) { |
| val leftFieldCnt = rel.getLeft.getRowType.getFieldCount |
| val filterNulls = new util.ArrayList[java.lang.Boolean] |
| val cond = JoinInfo.of(rel.getLeft, rel.getRight, rel.getCondition, filterNulls) |
| val keys = cond.leftKeys ++ cond.rightKeys.map(_ + leftFieldCnt) |
| |
| def filterNull(): Boolean = { |
| var i = keys.indexOf(index) |
| if (i >= cond.leftKeys.length) { |
| i = i - cond.leftKeys.length |
| } |
| filterNulls(i) |
| } |
| |
| if (keys.contains(index) && filterNull()) { |
| 0D |
| } else { |
| // As same with its children, there may be better ways to estimate it. |
| // With JoinNullFilterPushdownRule, we can generate more NotNullFilters. |
| if (index < leftFieldCnt) { |
| fmq.getColumnOriginNullCount(rel.getLeft, index) |
| } else { |
| fmq.getColumnOriginNullCount(rel.getRight, index - leftFieldCnt) |
| } |
| } |
| } else { |
| null |
| } |
| } |
| |
| def getColumnOriginNullCount(rel: RelNode, mq: RelMetadataQuery, index: Int): JDouble = null |
| } |
| |
| object FlinkRelMdColumnOriginNullCount { |
| |
| private val INSTANCE = new FlinkRelMdColumnOriginNullCount |
| |
| val SOURCE: RelMetadataProvider = ReflectiveRelMetadataProvider.reflectiveSource( |
| FlinkMetadata.ColumnOriginNullCount.METHOD, INSTANCE) |
| |
| } |