boyjoy1127 commented on code in PR #20186: URL: https://github.com/apache/shardingsphere/pull/20186#discussion_r949105909
########## shardingsphere-infra/shardingsphere-infra-federation/shardingsphere-infra-federation-optimizer/src/main/java/org/apache/shardingsphere/infra/federation/optimizer/metadata/translatable/TranslatableTableScan.java: ########## @@ -0,0 +1,212 @@ +/* + * 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.shardingsphere.infra.federation.optimizer.metadata.translatable; + +import com.google.common.collect.ImmutableList; +import lombok.Getter; +import org.apache.calcite.adapter.enumerable.EnumerableConvention; +import org.apache.calcite.adapter.enumerable.EnumerableRel; +import org.apache.calcite.adapter.enumerable.EnumerableRelImplementor; +import org.apache.calcite.adapter.enumerable.PhysType; +import org.apache.calcite.adapter.enumerable.PhysTypeImpl; +import org.apache.calcite.linq4j.tree.Blocks; +import org.apache.calcite.linq4j.tree.Expressions; +import org.apache.calcite.linq4j.tree.Primitive; +import org.apache.calcite.plan.RelOptCluster; +import org.apache.calcite.plan.RelOptCost; +import org.apache.calcite.plan.RelOptPlanner; +import org.apache.calcite.plan.RelOptTable; +import org.apache.calcite.plan.RelTraitSet; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.RelWriter; +import org.apache.calcite.rel.core.TableScan; +import org.apache.calcite.rel.metadata.RelMetadataQuery; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rel.type.RelDataTypeFactory; +import org.apache.calcite.rel.type.RelDataTypeField; +import org.apache.calcite.rex.RexCall; +import org.apache.calcite.rex.RexInputRef; +import org.apache.calcite.rex.RexLiteral; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.sql.SqlKind; +import org.codehaus.groovy.runtime.InvokerHelper; + +import java.util.Arrays; +import java.util.List; + +/** + * Relational expression representing a scan. + * Like any table scan, it serves as a leaf node of a query tree. + */ +@Getter +public class TranslatableTableScan extends TableScan implements EnumerableRel { + + private final FederationTranslatableTable translatableTable; + + private final int[] fields; + + private final List<RexNode> filters; + + public TranslatableTableScan(final RelOptCluster cluster, final RelOptTable table, + final FederationTranslatableTable translatableTable, final int[] fields) { + super(cluster, cluster.traitSetOf(EnumerableConvention.INSTANCE), ImmutableList.of(), table); + this.translatableTable = translatableTable; + this.fields = fields; + this.filters = null; + assert translatableTable != null; + } + + public TranslatableTableScan(final RelOptCluster cluster, final RelOptTable table, + final FederationTranslatableTable translatableTable, final List<RexNode> filters, final int[] fields) { + super(cluster, cluster.traitSetOf(EnumerableConvention.INSTANCE), ImmutableList.of(), table); + this.translatableTable = translatableTable; + this.fields = fields; + this.filters = filters; + assert translatableTable != null; + } + + @Override + public RelNode copy(final RelTraitSet traitSet, final List<RelNode> inputs) { + assert inputs.isEmpty(); + return new TranslatableTableScan(getCluster(), table, translatableTable, fields); + } + + @Override + public String toString() { + if (null != filters) { + final String[] filterValues = new String[fields.length]; + addFilter(filters, filterValues); + return "TranslatableTableScan{" + + "translatableTable=" + translatableTable + + ", fields=" + Arrays.toString(fields) + + ", filters=" + Arrays.toString(filterValues) + + '}'; + } + return "TranslatableTableScan{" + + "translatableTable=" + translatableTable + + ", fields=" + Arrays.toString(fields) + + '}'; + } + + @Override + public RelWriter explainTerms(final RelWriter pw) { + if (null != filters) { + final String[] filterValues = new String[fields.length]; + addFilter(filters, filterValues); + return super.explainTerms(pw) + .item("fields", Primitive.asList(fields)) + .item("filters", Primitive.asList(filterValues)); + } + return super.explainTerms(pw) + .item("fields", Primitive.asList(fields)); + } + + @Override + public RelDataType deriveRowType() { + final List<RelDataTypeField> fieldList = table.getRowType().getFieldList(); + final RelDataTypeFactory.Builder builder = + getCluster().getTypeFactory().builder(); + for (int field : fields) { + builder.add(fieldList.get(field)); + } + return builder.build(); + } + + @Override + public void register(final RelOptPlanner planner) { + planner.addRule(TranslatableProjectFilterRule.INSTANCE); + planner.addRule(TranslatableFilterRule.INSTANCE); + planner.addRule(TranslatableProjectRule.INSTANCE); + } + + @Override + public RelOptCost computeSelfCost(final RelOptPlanner planner, + final RelMetadataQuery mq) { + // Multiply the cost by a factor that makes a scan more attractive if it Review Comment: The comment is useful. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
