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[FLINK-11884][table] JoinTableOperation construction & tranformation …
…to RelNodes This closes apache#8062
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...nk-table-api-java/src/main/java/org/apache/flink/table/operations/JoinTableOperation.java
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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.operations; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation; | ||
| import org.apache.flink.table.api.TableSchema; | ||
| import org.apache.flink.table.expressions.Expression; | ||
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|
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| import java.util.Arrays; | ||
| import java.util.List; | ||
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| /** | ||
| * Table operation that joins two relational operations based on given condition. | ||
| */ | ||
| @Internal | ||
| public class JoinTableOperation implements TableOperation { | ||
| private final TableOperation left; | ||
| private final TableOperation right; | ||
| private final JoinType joinType; | ||
| private final Expression condition; | ||
| private final boolean correlated; | ||
| private final TableSchema tableSchema; | ||
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| /** | ||
| * Specifies how the two Tables should be joined. | ||
| */ | ||
| public enum JoinType { | ||
| INNER, | ||
| LEFT_OUTER, | ||
| RIGHT_OUTER, | ||
| FULL_OUTER | ||
| } | ||
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| public JoinTableOperation( | ||
| TableOperation left, | ||
| TableOperation right, | ||
| JoinType joinType, | ||
| Expression condition, | ||
| boolean correlated) { | ||
| this.left = left; | ||
| this.right = right; | ||
| this.joinType = joinType; | ||
| this.condition = condition; | ||
| this.correlated = correlated; | ||
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| this.tableSchema = calculateResultingSchema(left, right); | ||
| } | ||
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| private TableSchema calculateResultingSchema(TableOperation left, TableOperation right) { | ||
| TableSchema leftSchema = left.getTableSchema(); | ||
| TableSchema rightSchema = right.getTableSchema(); | ||
| int resultingSchemaSize = leftSchema.getFieldCount() + rightSchema.getFieldCount(); | ||
| String[] newFieldNames = new String[resultingSchemaSize]; | ||
| System.arraycopy(leftSchema.getFieldNames(), 0, newFieldNames, 0, leftSchema.getFieldCount()); | ||
| System.arraycopy( | ||
| rightSchema.getFieldNames(), | ||
| 0, | ||
| newFieldNames, | ||
| leftSchema.getFieldCount(), | ||
| rightSchema.getFieldCount()); | ||
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| TypeInformation[] newFieldTypes = new TypeInformation[resultingSchemaSize]; | ||
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| System.arraycopy(leftSchema.getFieldTypes(), 0, newFieldTypes, 0, leftSchema.getFieldCount()); | ||
| System.arraycopy( | ||
| rightSchema.getFieldTypes(), | ||
| 0, | ||
| newFieldTypes, | ||
| leftSchema.getFieldCount(), | ||
| rightSchema.getFieldCount()); | ||
| return new TableSchema(newFieldNames, newFieldTypes); | ||
| } | ||
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| public JoinType getJoinType() { | ||
| return joinType; | ||
| } | ||
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| public Expression getCondition() { | ||
| return condition; | ||
| } | ||
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| public boolean isCorrelated() { | ||
| return correlated; | ||
| } | ||
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| @Override | ||
| public TableSchema getTableSchema() { | ||
| return tableSchema; | ||
| } | ||
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| @Override | ||
| public List<TableOperation> getChildren() { | ||
| return Arrays.asList(left, right); | ||
| } | ||
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| @Override | ||
| public <T> T accept(TableOperationVisitor<T> visitor) { | ||
| return visitor.visitJoin(this); | ||
| } | ||
| } |
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